London penetration depth in Half- Heusler YPdBi and TbPdBi compounds

ORAL

Abstract

Using the combination of a tunnel diode oscillator (TDO) and a commercial dilution refrigerator, we measured temperature dependent magnetic penetration depth △λ(T) in single crystals of YPdBi and TbPdBi, down to temperatures as low as 0.1K. We found that penetration depths of both compounds do not show exponential temperature dependence and saturation at low temperatures, as expected for conventional BCS superconductors. Instead, in both materials, the penetration depth can be described by a power law △λ(T)=A×Tn . The coeficient A was found to be about 50% smaller in TbPdBi, but the exponents are very similar, n = 2.76 ± 0.04 in YPdBi and n = 2.6 ± 0.3 in TbPdBi, respectively. Our results suggest unconventional superconductivity in both YPdBi and TbPdBi.

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Presenters

  • Catalin Martin

    Eng. Physics, Ramapo College of NJ

Authors

  • Catalin Martin

    Eng. Physics, Ramapo College of NJ

  • Ali S.M. RADMANESH

    Advanced Materials Research Institute and Department of Physics, University of New Orleans

  • Yanglin Zhu

    Department of Physics and Engineering Physics, Tulane University, Tulane University, Physics and Engineering Physics, Tulane University

  • Zhiqiang Mao

    Pennsylvania State University, Physics, Pennsylvania State University, Department of Physics and Engineering Physics, Tulane University, Physics and Engineering Physics, Tulane University, Tulane University

  • Leonard Spinu

    Univ of New Orleans, Advanced Materials Research Institute and Department of Physics, University of New Orleans