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Malone, L.*; 松田 達磨; Antunes, A.*; Knebel, G.*; Taufour, V.*; 青木 大*; Behnia, K.*; Proust, C.*; Flouquet, J.*
Physical Review B, 83(24), p.245117_1 - 245117_5, 2011/06
被引用回数:16 パーセンタイル:55.50(Materials Science, Multidisciplinary)Measurements of the thermoelectric coefficients of URuSi in a high magnetic field could imply topological Fermi surface changes even deep inside the hidden order state. A change is observed in the thermopower as a function of the field applied parallel to the easy axis of magnetization, which could signify a change in the Fermi surface characteristics. The maximum of the thermopower coincides with previously measured anomalies in resistivity at = 23T. We analyze our results in terms of a Lifshitz transition in URuSi originating from the hidden order Pauli depairing on a given subband.
岡崎 竜二*; 笠原 裕一*; 宍戸 寛明*; Konczykowski, M.*; Behnia, K.*; 芳賀 芳範; 松田 達磨; 大貫 惇睦; 芝内 孝禎*; 松田 祐司*
Physical Review Letters, 100(3), p.037004_1 - 037004_4, 2008/01
被引用回数:28 パーセンタイル:76.29(Physics, Multidisciplinary)We find that in ultraclean heavy-fermion superconductor URuSi ( K) a distinck flux line lattice melting transition with outstanding characters occurs well below the mean-field upper critical fields. We show that a very small number of carriers with heavy mass in this system results in exceptionally large thermal fluctuations even at subkelvin temperatures, which are witnessed by a sizable region of the flux line liquid phase. The uniqueness is further highlighted by an enhancement of the quasiparticle mean free path below the melting transition, implying a possible formation of a quasiparticle Bloch state in the periodic flux line lattice.
笠原 裕一*; 岩澤 卓矢*; 宍戸 寛明*; 芝内 孝禎*; Behnia, K.*; 芳賀 芳範; 松田 達磨; 大貫 惇睦; Sigrist, M.*; 松田 祐司*
Physical Review Letters, 99(116), p.116402_1 - 116402_4, 2007/09
被引用回数:179 パーセンタイル:96.87(Physics, Multidisciplinary)We show that the charge and thermal transport measurements on ultraclean crystals of URuSi reveal a number of unprecedented superconducting properties. The uniqueness is best highlighted by the peculiar field dependence of thermal conductivity including the first order transition at with a reduction of entropy flow. This is a consequence of multi-band superconductivity with compensated electronic structure in the hidden order state of this system. We provide strong evidence for a new type of unconventional superconductivity with two distinct gaps having different nodal topology.