Nature of the double superconducting transition in PrOs4Sb12?

We present evidence which casts doubt on the intrinsic nature of the double superconducting transition ( and ) of the filled skutterudite compound PrOs4Sb12. Because of similar behaviors of Tc1 and Tc2, the magnetic field and pressure dependence of the transitions are not conclusive. Further charact...

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Veröffentlicht in:	Physica. B, Condensed matter Condensed matter, 2006-05, Vol.378-80, p.56-57
Hauptverfasser:	MEASSON, M.-A, BRAITHWAITE, D, SALCE, B, FLOUQUET, J, LAPERTOT, G, PECAUT, J, SEYFARTH, G, BRISON, J.-P, SUGAWARA, H, SATO, H
Format:	Artikel
Sprache:	eng
Schlagworte:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Exact sciences and technology Heavy-fermion superconductors Physics Pressure effects Superconducting materials (excluding high-tc compounds) Superconductivity Transition temperature variations
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Beschreibung
Zusammenfassung:	We present evidence which casts doubt on the intrinsic nature of the double superconducting transition ( and ) of the filled skutterudite compound PrOs4Sb12. Because of similar behaviors of Tc1 and Tc2, the magnetic field and pressure dependence of the transitions are not conclusive. Further characterizations show a wide range of values of the ratio of the two specific heat jumps DeltaC(Tc1)/DeltaC(Tc2) on crystals from different batches and even within the same batch. Moreover, one sample exhibits a single sharp transition of 18mK in width at . It has been characterized by specific heat, AC susceptibility and resistivity. A normalized specific heat jump DeltaC(Tc)/C(Tc) of 25% which matches the sum of the two specific heat jumps in the other samples has been obtained.
ISSN:	0921-4526
DOI:	10.1016/j.physb.2006.01.169