Magnetism and Superconductivity in the Filled Skutterudite Pr<sub>1-x</sub>Eu<sub>x</sub>Pt<sub>4</sub>Ge<sub>12</sub> System

ORAL

Abstract

We present results of heat capacity (HC) measurements on filled skutterudite Pr1-xEuxPt4Ge12 (0 ≤ x ≤ 1) system to investigate the effect of Eu substitution on superconductivity (SC) and magnetism in this system. Increasing Eu content leads to the suppression of the SC transition temperature (Tc), with no evidence of SC for samples with x > 0.5 both from resistivity and HC measurements down to 0.5 K. The x > 0.7 samples display antifferomagnetism (AFM) with the Neel temperature increasing with increasing Eu content. The HC data reveal the presence of HC anomaly for the whole Eu doping range (0.05 ≤ x ≤ 1). The HC peak for the samples with x > 0.5 reflects the AFM of Eu moments since it is suppressed to lower T with increasing magnetic field. The HC peak for the samples with x ≤ 0.5 is a result of a net moment present at T < Tc since the position of the peak shifts to higher T with increasing magnetic field. In addition, the magnetic entropy increases linearly with increasing Eu content and it reveals an octet ground state, i.e., S = xRln8. The net internal field lifts this degeneracy and gives rise to the Schottky anomaly in HC.

*This work was supported at KSU by the Grant No. NSF-DMR-1505826 and at UCSD by Grant No. NSF-DMR-1206553 and the Grant No. DOE-DE-FG02-04-ER46105.

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Presenters

  • Ram Adhikari

    • Department of Physics, Kent State University
    • Kent State University

Authors

  • Ram Adhikari

    • Department of Physics, Kent State University
    • Kent State University

  • Dom Kunwar

    • Kent State University

  • Inho Jeon

    • University of California, San Diego
    • Physics, University of California, San Diego
    • Department of Physics, University of California, San Diego
    • Materials Science and Engineering, University of California, San Diego
    • Materials Science and Engineering Program and Center for Advanced Nanoscience, University of California, San Diego
    • Materials Science and Engineering Program, and Center for Advanced Nanoscience, Univ of California - San Diego
    • Materials Science and Engineering Program, Univ of California - San Diego
    • University of California-San Diego

  • Shen Ran

    • University of California-San Diego

  • M Brian Maple

    • Department of Physics, University of California, San Diego
    • University of California, San Diego
    • Physics, University of California, San Diego
    • Univ of California - San Diego
    • Department of Physics and Center for Advanced Nanoscience, University of California, San Diego
    • Department of Physics, Center for Advanced Nanoscience,Materials Science and Engineering Program , Univ of California - San Diego
    • Department of Physics, University of California San Diego
    • Physics, Univ of California - San Diego
    • University of California-San Diego
    • UC San Diego
    • Physics, UC San Diego

  • Carmen Almasan

    • Kent State
    • Department of Physics, Kent State University
    • Kent State University