Slow magnetic fluctuations in the pseudogap phase of YBa2Cu3Oy

ORAL

Abstract

We report broken time-reversal symmetry in the pseudogap state of underdoped single crystalline YBa2Cu3Oy using muon spin relaxation technique. Slow magnetic fluctuations are observed below the characteristic pseudogap onset temperature T*, signaled by the Redfield relation between the Lorentzian relaxation rate of the positive muons and the applied field along the muon initial spin polarization. We measured the temperature dependence of the local field and compared it with the order parameter measured by neutron scattering. The slow frequency scale of the fluctuations, 5 orders of magnitude below the energy scale of the pseduogap energy, implies that time-reversal symmetry is broken for properties intermediate between the two scales, but raises the question of the nature of the quantum fluctuations responsible for time-reversal not being absolutely broken.

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Presenters

  • Jian Zhang

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China, Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China.

Authors

  • Jian Zhang

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China, Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China.

  • Douglas E. MacLaughlin

    Physics and Astronomy, University of California, Riverside, Riverside, CA 92521, Department of Physics and Astronomy, University of California, Riverside, Riverside, CA 92521, USA.

  • Zhaofeng Ding

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China, Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China.

  • Cheng Tan

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China, Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China.

  • Oscar Bernal

    Physics Department, California State University, Los Angeles 90032, Department of Physics, California State University Los Angeles, Physics and Astronomy, California State University, Los Angeles, Los Angeles, CA 90032, Physics, California State University, Los Angeles, Department of Physics and Astronomy, California State University, Los Angeles, CA 90032, USA.

  • Pei-Chun Ho

    Department of Physics, California State University, Fresno, Fresno, CA 93740, California State University, Fresno, Physics, California State University, Fresno, Department of Physics, California State University, Fresno, CA 93740, USA.

  • Gerald D Morris

    Center for Molecular and Materials Science, TRIUMF, Vancouver, BC V6T 2A3, Canada, Physical Sciences Division, TRIUMF, TRIUMF, TRIUMF, Vancouver, British Columbia V6T 2A3, Canada.

  • Akihiro Koda

    Muon Science Laboratory and Condensed Matter Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)

  • Adrian Hillier

    ISIS Neutron and Muon Source Science and Technology Facilities Council, ISIS Neutron and Muon Sources, Science & Technology Facilities Council, ISIS Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0QX, UK.

  • Stephen P. Cottrell

    Rutherford-Appleton Laboratory, ISIS Neutron and Muon Source, ISIS Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0QX, UK.

  • Peter J. Baker

    ISIS Facility, Rutherford Appleton Laboratory, ISIS Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0QX, UK.

  • P. K. Biswas

    ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, ISIS Neutron and Muon Sources, Science & Technology Facilities Council, ISIS Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Chilton, Didcot OX11 0QX, UK., ISIS, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, UK

  • Yanxing Yang

    Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China.

  • Zihao Zhu

    Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China.

  • Jun Qian

    State Key Lab for Metal Matrix Composites, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai

  • Yan Wan

    State Key Lab for Metal Matrix Composites, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai

  • Xin Yao

    State Key Lab for Metal Matrix Composites, Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics and Astronomy, Shanghai

  • Lei Shu

    State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China, Fudan University, Physics, Fudan University, State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, People’s Republic of China.