Investigation of Broken Time Reversal Symmetry in the Pr-rich side of Pr1-xNdxOs4Sb12

ORAL

Abstract

One of the intriguing features that indicate unconventional superconductivity (SC) in the filled skutterudite compound PrOs4Sb12 is the broken time reversal symmetry (TRS). The preliminary analysis of our most-recent results of µSR experiments in Pr1-xNdxOs4Sb12 of x=0.05, 0.1, 0.15 and 0.2, at 0 magnetic field, a combined exponential and Gaussian relaxation behavior was found. As T decreases, the exponential rate λ increases, while the Gaussian rate Δ has a slight decrease below Tc. The increase of Δ below Tc, previously observed in PrOs4Sb12, is not seen for x≥0.05, indicating that TRS is no longer broken. λ here is expected to be mainly dynamic in nature and has a strong temperature dependence below Tc. λ grows with increasing x, which may be due to a quantum critical point or transition below 0.05K. The origin of the anomalous shape of λ(T) in TF-μSR below Tc for of x=0.15 and 0.2 is currently unknown.

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Presenters

  • 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.

Authors

  • 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.

  • Douglas E MacLaughlin

    Physics, University of California, Riverside

  • M Brian Maple

    University of California, San Diego, Department of Physics, University of California, San Diego, La Jolla, CA 92093, Department of Physics, University of California, San Diego, UC San Diego, Physics, University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA, Physics, University of California, SanDiego

  • 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.

  • 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.

  • 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.

  • Tatsuya Yanagisawa

    Department of Physics, Hokkaido University, Sapporo 060-0810, Japan, Hokkaido University, Physics, Hokkaido University

  • 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

  • Jian Zhang

    Physics, Fudan University

  • Cheng Tan

    Physics, Fudan University

  • Shoji D Hishida

    California State University, Fresno, Physics, California State University, Fresno

  • Taylor McCullough-Hunter

    Physics, California State University, Fresno