Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 3: Correlated Electrons - Heavy Fermions
TT 3.1: Talk
Friday, March 4, 2005, 10:15–10:30, TU H3027
Multiband Superconductivity in the heavy fermion PrOs4 Sb12 — •Gabriel Seyfarth1, Jean-Pascal Brison1, Marie-Aude Méasson2, Jacques Flouquet2, Koichi Izawa3, Y. Matsuda3, H. Sugawara4, and H. Sato4 — 1CRTBT-CNRS, 38042 Grenoble, France — 2CEA-Grenoble, 38054 Grenoble, Fance — 3ISSP, Chiba 277-8581, Japan — 4Tokyo Metropolitan University, Tokyo 192-0397, Japan
In our contribution we show that several experimental measurements indicate that the superconducting phase of PrOs4Sb12 [1] involves quasiparticles of different effective masses and different gap amplitudes, i.e. it has a multiband character, like it is observed in the archetype of this class of superconductors, MgB2 [3]. These evidences come a) from Hc2(T) calculations (published in [5]) that reproduce the small positive curvature at low fields, assuming the existence of two different electronic bands, b) from Andreev-reflection measurements in Au-PrOs4Sb12 junctions and c) from the low field dependence of thermal transport measurements in the superconducting phase at very low temperatures (50mK). They are supported by dHvA measurements [6], which reveal a large spread of effective masses on the different sheets of the Fermi surface of this strongly correlated system. The discussion will include other experimental results which were interpreted in terms of unconventional superconductivity [2],[4].
References :
[1] E. D. Bauer (2002) Phys. Rev. B 65 100506 [2] E. Chia (2003) PRL 91 247003 [3] F. Giubileo (2001) PRL 87 177008 [4] K. Izawa (2003) PRL 90 117001 [5] M.-A. Measson (2004) Phys. Rev. B 70 064516 [6] H. Sugawara (2003) Acta Physica Polonica B 34 1125