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29 March 2024
 
  » pubmed » pmid12633389

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Low-temperature specific heat of the heavy-fermion superconductor PrOs4Sb12
R Vollmer ; A Faisst ; C Pfleiderer ; H V Löhneysen ; E D Bauer ; P-C Ho ; V Zapf ; M B Maple ;
Date 7 Feb 2003
Journal Phys Rev Lett, 90 (5), 057001
AbstractWe report the magnetic field dependence of the specific-heat C of single crystals of the first Pr-based heavy-fermion superconductor Pr(Os4Sb12. The variation of C at low temperature and the magnetic phase diagram inferred from C, the resistivity and magnetization provide compelling evidence of a doublet ground state. Two distinct superconducting anomalies in C indicate an unconventional superconducting state, where the splitting may arise from a weak lifting of the ground state degeneracy. In combination this identifies Pr(Os4Sb12 as a strong contender for quadrupolar pairing, i.e., superconductivity that is neither electron-phonon nor magnetically mediated.
Source PubMed, pmid12633389
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