Investigation of Broken Time Reversal Symmetry in the Pr-rich side of Pr<sub>1-x</sub>Nd<sub>x</sub>Os4Sb<sub>12</sub>

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.

*Research at CSU-Fresno is supported by NSF DMR-1506677; at UCSD by US DOE DE-FG02-04ER46105 and NSF DMR-1810310, at CSU-LA by NSF DMR-1523588; at Fudan U. by Chinese NSF-1147060; at Hokkaido U. by JSPS KAKENHI 26400342, 15K05882, and 15K21732.

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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