Superfluid density in 2D organic superconductors: evidence for d-wave pairing

ORAL

Abstract

Organic superconductors are an exciting ``playground'' for low dimensional physics, with a clean, layered structure that exhibits a variety of electronic phases including superconductivity. The interactions responsible for pairing, and the symmetry of the pair wavefunction, continue to be open issues in these materials. To gain further insights, we have carried out microwave spectroscopy of two BEDT-TTF-based superconductors. Penetration depth measurements reveal a strong, linear temperature dependence of superfluid density, indicating line nodes in the order parameter and providing strong evidence for $d$-wave pairing. Measurements of the microwave conductivity allow us to extract the quasiparticle scattering rate, both above \textit{and} below $T_{c}$. In the normal state, the scattering is strong, at several times the thermal energy. Below $T_{c}$ there is a rapid drop in scattering, with a $T^{3}$ temperature dependence characteristic of $d$-wave quasiparticles scattering from antiferromagnetic spin fluctuations.

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Authors

  • Sonia Milbradt

    Department of Physics, Simon Fraser University

  • Andrew Bardin

    Centre for Organic Photonics and Electronics, School of Mathematics and Physics, University of Queensland

  • C. Andreoiu

    University of Washington, Centre for Organic Photonics and Electronics, School of Chemistry and Molecular Biosciences, University of Queensland, Centre for Organic Photonics and Electronics, School of Mathematics and Physics, University of Queensland, Department of Physics, Simon Fraser University, Dalhousie University, Faculty of Mathematics, University of Waterloo, Department of Physics, McMaster University, SLAC National Accelerator Laboratory, Stanford University, Stanford University, IFW-Dresden, Northern Illinois University, University of British Columbia, University of Michigan, Simon Fraser University, Institute for Quantum Computing, University of Waterloo, Washington State University, The University of British Columbia, The Weizmann Institute of Science, Oregon State University, University of Massachusetts Lowell, Aixtron Ltd., Cornell University, TRIUMF, Society of Physics Students, Western Washington University, Department of Physics and Astronomy, Washington State University, University of Portland, Pacific University, University of Idaho, Department of Physics, University of Washington, Emory University, SFU, Arizona State University, Research Centre J\"ulich, University of Victoria, EPM, \'Ecole Polytechnique de Montr\'eal (EPM), Technical U of Denmark, Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Department of Physics, Portland State University, Portland, OR 97201, Department of Physics, Oregon State University, Corvallis, OR 97331, Department of Physics, Cornell University, Ithaca, NY 14853, Linfield College, Portland State University, University of British Columbia Physics and Astronomy, University of British Columbia Chemistry, Max Planck Institute for Polymer Research, Simon Fraser, Los Alamos National Lab, Los Alamos, McGill University, Los Alamos National Laboratory, University of Cambridge, CSNSM-IN2P3-CNRS, University of Manitobia, Univ. of British Columbia and TRIUMF, Ruprecht-Karls-Universitat and MPI and TRIUMF, Westfaelische Wilhelms-Universitaet, Univ. of Manitoba and TRIUMF, Tenische Universitaet Muenchen and TRIUMF, Simon Fraser Univ. and TRIUMF, University of British Columbia, TRIUMF, Ruprecht-Karls-Universit\"at Heidelberg, Max Planck Institute, TRIUMF, Westf\"alische Wilhelms-Universit\"at, TRIUMF, Johannes Gutenberg-Universit\"at Mainz, Ruprecht-Karls-Universit\"at Heidelberg, Univerity of Manitoba, TRIUMF, Simon Fraser University, TRIUMF, TRIUMF \& University of Manitoba, College of William and Mary, Universidad Autonoma de San Luis Potosi, University of Maryland, University of Manitoba, UBC, Texas A\&M, University of Kentucky, Georgia Institute of Technology, University of Guelph, St. Mary's University

  • C. Andreoiu

    University of Washington, Centre for Organic Photonics and Electronics, School of Chemistry and Molecular Biosciences, University of Queensland, Centre for Organic Photonics and Electronics, School of Mathematics and Physics, University of Queensland, Department of Physics, Simon Fraser University, Dalhousie University, Faculty of Mathematics, University of Waterloo, Department of Physics, McMaster University, SLAC National Accelerator Laboratory, Stanford University, Stanford University, IFW-Dresden, Northern Illinois University, University of British Columbia, University of Michigan, Simon Fraser University, Institute for Quantum Computing, University of Waterloo, Washington State University, The University of British Columbia, The Weizmann Institute of Science, Oregon State University, University of Massachusetts Lowell, Aixtron Ltd., Cornell University, TRIUMF, Society of Physics Students, Western Washington University, Department of Physics and Astronomy, Washington State University, University of Portland, Pacific University, University of Idaho, Department of Physics, University of Washington, Emory University, SFU, Arizona State University, Research Centre J\"ulich, University of Victoria, EPM, \'Ecole Polytechnique de Montr\'eal (EPM), Technical U of Denmark, Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Department of Physics, Portland State University, Portland, OR 97201, Department of Physics, Oregon State University, Corvallis, OR 97331, Department of Physics, Cornell University, Ithaca, NY 14853, Linfield College, Portland State University, University of British Columbia Physics and Astronomy, University of British Columbia Chemistry, Max Planck Institute for Polymer Research, Simon Fraser, Los Alamos National Lab, Los Alamos, McGill University, Los Alamos National Laboratory, University of Cambridge, CSNSM-IN2P3-CNRS, University of Manitobia, Univ. of British Columbia and TRIUMF, Ruprecht-Karls-Universitat and MPI and TRIUMF, Westfaelische Wilhelms-Universitaet, Univ. of Manitoba and TRIUMF, Tenische Universitaet Muenchen and TRIUMF, Simon Fraser Univ. and TRIUMF, University of British Columbia, TRIUMF, Ruprecht-Karls-Universit\"at Heidelberg, Max Planck Institute, TRIUMF, Westf\"alische Wilhelms-Universit\"at, TRIUMF, Johannes Gutenberg-Universit\"at Mainz, Ruprecht-Karls-Universit\"at Heidelberg, Univerity of Manitoba, TRIUMF, Simon Fraser University, TRIUMF, TRIUMF \& University of Manitoba, College of William and Mary, Universidad Autonoma de San Luis Potosi, University of Maryland, University of Manitoba, UBC, Texas A\&M, University of Kentucky, Georgia Institute of Technology, University of Guelph, St. Mary's University

  • C. Andreoiu

    University of Washington, Centre for Organic Photonics and Electronics, School of Chemistry and Molecular Biosciences, University of Queensland, Centre for Organic Photonics and Electronics, School of Mathematics and Physics, University of Queensland, Department of Physics, Simon Fraser University, Dalhousie University, Faculty of Mathematics, University of Waterloo, Department of Physics, McMaster University, SLAC National Accelerator Laboratory, Stanford University, Stanford University, IFW-Dresden, Northern Illinois University, University of British Columbia, University of Michigan, Simon Fraser University, Institute for Quantum Computing, University of Waterloo, Washington State University, The University of British Columbia, The Weizmann Institute of Science, Oregon State University, University of Massachusetts Lowell, Aixtron Ltd., Cornell University, TRIUMF, Society of Physics Students, Western Washington University, Department of Physics and Astronomy, Washington State University, University of Portland, Pacific University, University of Idaho, Department of Physics, University of Washington, Emory University, SFU, Arizona State University, Research Centre J\"ulich, University of Victoria, EPM, \'Ecole Polytechnique de Montr\'eal (EPM), Technical U of Denmark, Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Department of Physics, Portland State University, Portland, OR 97201, Department of Physics, Oregon State University, Corvallis, OR 97331, Department of Physics, Cornell University, Ithaca, NY 14853, Linfield College, Portland State University, University of British Columbia Physics and Astronomy, University of British Columbia Chemistry, Max Planck Institute for Polymer Research, Simon Fraser, Los Alamos National Lab, Los Alamos, McGill University, Los Alamos National Laboratory, University of Cambridge, CSNSM-IN2P3-CNRS, University of Manitobia, Univ. of British Columbia and TRIUMF, Ruprecht-Karls-Universitat and MPI and TRIUMF, Westfaelische Wilhelms-Universitaet, Univ. of Manitoba and TRIUMF, Tenische Universitaet Muenchen and TRIUMF, Simon Fraser Univ. and TRIUMF, University of British Columbia, TRIUMF, Ruprecht-Karls-Universit\"at Heidelberg, Max Planck Institute, TRIUMF, Westf\"alische Wilhelms-Universit\"at, TRIUMF, Johannes Gutenberg-Universit\"at Mainz, Ruprecht-Karls-Universit\"at Heidelberg, Univerity of Manitoba, TRIUMF, Simon Fraser University, TRIUMF, TRIUMF \& University of Manitoba, College of William and Mary, Universidad Autonoma de San Luis Potosi, University of Maryland, University of Manitoba, UBC, Texas A\&M, University of Kentucky, Georgia Institute of Technology, University of Guelph, St. Mary's University

  • C. Andreoiu

    University of Washington, Centre for Organic Photonics and Electronics, School of Chemistry and Molecular Biosciences, University of Queensland, Centre for Organic Photonics and Electronics, School of Mathematics and Physics, University of Queensland, Department of Physics, Simon Fraser University, Dalhousie University, Faculty of Mathematics, University of Waterloo, Department of Physics, McMaster University, SLAC National Accelerator Laboratory, Stanford University, Stanford University, IFW-Dresden, Northern Illinois University, University of British Columbia, University of Michigan, Simon Fraser University, Institute for Quantum Computing, University of Waterloo, Washington State University, The University of British Columbia, The Weizmann Institute of Science, Oregon State University, University of Massachusetts Lowell, Aixtron Ltd., Cornell University, TRIUMF, Society of Physics Students, Western Washington University, Department of Physics and Astronomy, Washington State University, University of Portland, Pacific University, University of Idaho, Department of Physics, University of Washington, Emory University, SFU, Arizona State University, Research Centre J\"ulich, University of Victoria, EPM, \'Ecole Polytechnique de Montr\'eal (EPM), Technical U of Denmark, Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Department of Physics, Portland State University, Portland, OR 97201, Department of Physics, Oregon State University, Corvallis, OR 97331, Department of Physics, Cornell University, Ithaca, NY 14853, Linfield College, Portland State University, University of British Columbia Physics and Astronomy, University of British Columbia Chemistry, Max Planck Institute for Polymer Research, Simon Fraser, Los Alamos National Lab, Los Alamos, McGill University, Los Alamos National Laboratory, University of Cambridge, CSNSM-IN2P3-CNRS, University of Manitobia, Univ. of British Columbia and TRIUMF, Ruprecht-Karls-Universitat and MPI and TRIUMF, Westfaelische Wilhelms-Universitaet, Univ. of Manitoba and TRIUMF, Tenische Universitaet Muenchen and TRIUMF, Simon Fraser Univ. and TRIUMF, University of British Columbia, TRIUMF, Ruprecht-Karls-Universit\"at Heidelberg, Max Planck Institute, TRIUMF, Westf\"alische Wilhelms-Universit\"at, TRIUMF, Johannes Gutenberg-Universit\"at Mainz, Ruprecht-Karls-Universit\"at Heidelberg, Univerity of Manitoba, TRIUMF, Simon Fraser University, TRIUMF, TRIUMF \& University of Manitoba, College of William and Mary, Universidad Autonoma de San Luis Potosi, University of Maryland, University of Manitoba, UBC, Texas A\&M, University of Kentucky, Georgia Institute of Technology, University of Guelph, St. Mary's University

  • C. Andreoiu

    University of Washington, Centre for Organic Photonics and Electronics, School of Chemistry and Molecular Biosciences, University of Queensland, Centre for Organic Photonics and Electronics, School of Mathematics and Physics, University of Queensland, Department of Physics, Simon Fraser University, Dalhousie University, Faculty of Mathematics, University of Waterloo, Department of Physics, McMaster University, SLAC National Accelerator Laboratory, Stanford University, Stanford University, IFW-Dresden, Northern Illinois University, University of British Columbia, University of Michigan, Simon Fraser University, Institute for Quantum Computing, University of Waterloo, Washington State University, The University of British Columbia, The Weizmann Institute of Science, Oregon State University, University of Massachusetts Lowell, Aixtron Ltd., Cornell University, TRIUMF, Society of Physics Students, Western Washington University, Department of Physics and Astronomy, Washington State University, University of Portland, Pacific University, University of Idaho, Department of Physics, University of Washington, Emory University, SFU, Arizona State University, Research Centre J\"ulich, University of Victoria, EPM, \'Ecole Polytechnique de Montr\'eal (EPM), Technical U of Denmark, Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Department of Physics, Portland State University, Portland, OR 97201, Department of Physics, Oregon State University, Corvallis, OR 97331, Department of Physics, Cornell University, Ithaca, NY 14853, Linfield College, Portland State University, University of British Columbia Physics and Astronomy, University of British Columbia Chemistry, Max Planck Institute for Polymer Research, Simon Fraser, Los Alamos National Lab, Los Alamos, McGill University, Los Alamos National Laboratory, University of Cambridge, CSNSM-IN2P3-CNRS, University of Manitobia, Univ. of British Columbia and TRIUMF, Ruprecht-Karls-Universitat and MPI and TRIUMF, Westfaelische Wilhelms-Universitaet, Univ. of Manitoba and TRIUMF, Tenische Universitaet Muenchen and TRIUMF, Simon Fraser Univ. and TRIUMF, University of British Columbia, TRIUMF, Ruprecht-Karls-Universit\"at Heidelberg, Max Planck Institute, TRIUMF, Westf\"alische Wilhelms-Universit\"at, TRIUMF, Johannes Gutenberg-Universit\"at Mainz, Ruprecht-Karls-Universit\"at Heidelberg, Univerity of Manitoba, TRIUMF, Simon Fraser University, TRIUMF, TRIUMF \& University of Manitoba, College of William and Mary, Universidad Autonoma de San Luis Potosi, University of Maryland, University of Manitoba, UBC, Texas A\&M, University of Kentucky, Georgia Institute of Technology, University of Guelph, St. Mary's University

  • C. Andreoiu

    University of Washington, Centre for Organic Photonics and Electronics, School of Chemistry and Molecular Biosciences, University of Queensland, Centre for Organic Photonics and Electronics, School of Mathematics and Physics, University of Queensland, Department of Physics, Simon Fraser University, Dalhousie University, Faculty of Mathematics, University of Waterloo, Department of Physics, McMaster University, SLAC National Accelerator Laboratory, Stanford University, Stanford University, IFW-Dresden, Northern Illinois University, University of British Columbia, University of Michigan, Simon Fraser University, Institute for Quantum Computing, University of Waterloo, Washington State University, The University of British Columbia, The Weizmann Institute of Science, Oregon State University, University of Massachusetts Lowell, Aixtron Ltd., Cornell University, TRIUMF, Society of Physics Students, Western Washington University, Department of Physics and Astronomy, Washington State University, University of Portland, Pacific University, University of Idaho, Department of Physics, University of Washington, Emory University, SFU, Arizona State University, Research Centre J\"ulich, University of Victoria, EPM, \'Ecole Polytechnique de Montr\'eal (EPM), Technical U of Denmark, Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, Department of Physics, Portland State University, Portland, OR 97201, Department of Physics, Oregon State University, Corvallis, OR 97331, Department of Physics, Cornell University, Ithaca, NY 14853, Linfield College, Portland State University, University of British Columbia Physics and Astronomy, University of British Columbia Chemistry, Max Planck Institute for Polymer Research, Simon Fraser, Los Alamos National Lab, Los Alamos, McGill University, Los Alamos National Laboratory, University of Cambridge, CSNSM-IN2P3-CNRS, University of Manitobia, Univ. of British Columbia and TRIUMF, Ruprecht-Karls-Universitat and MPI and TRIUMF, Westfaelische Wilhelms-Universitaet, Univ. of Manitoba and TRIUMF, Tenische Universitaet Muenchen and TRIUMF, Simon Fraser Univ. and TRIUMF, University of British Columbia, TRIUMF, Ruprecht-Karls-Universit\"at Heidelberg, Max Planck Institute, TRIUMF, Westf\"alische Wilhelms-Universit\"at, TRIUMF, Johannes Gutenberg-Universit\"at Mainz, Ruprecht-Karls-Universit\"at Heidelberg, Univerity of Manitoba, TRIUMF, Simon Fraser University, TRIUMF, TRIUMF \& University of Manitoba, College of William and Mary, Universidad Autonoma de San Luis Potosi, University of Maryland, University of Manitoba, UBC, Texas A\&M, University of Kentucky, Georgia Institute of Technology, University of Guelph, St. Mary's University

  • David Broun

    Department of Physics, Simon Fraser University