PMID: 22587277May 17, 2012Paper

Twofold spontaneous symmetry breaking in the heavy-fermion superconductor UPt3

Physical Review Letters
Y MachidaK Machida

Abstract

The field-orientation dependent thermal conductivity of the heavy-fermion superconductor UPt3 was measured down to very low temperatures and under magnetic fields throughout the distinct superconducting phases: B and C phases. In the C phase, a striking twofold oscillation of the thermal conductivity within the basal plane is resolved reflecting the superconducting gap structure with a line of node along the a axis. Moreover, we find an abrupt vanishing of the oscillation across a transition to the B phase, as a clear indication of a change of gap symmetries. We also identify extra two line nodes below and above the equator in both B and C phases. From these results together with the symmetry consideration, the gap function of UPt3 is determined as a E(1u) representation characterized by a combination of two line nodes at the tropics and point nodes at the poles.

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Citations

Dec 4, 2015·Scientific Reports·Julien Garaud, Egor Babaev
Apr 4, 2017·Reports on Progress in Physics·Masatoshi Sato, Yoichi Ando
Aug 3, 2016·Reports on Progress in Physics·Toshiro SakakibaraKazushige Machida
Mar 11, 2017·Physical Review Letters·Fabian LambertIlya Eremin
Jun 27, 2018·Science Advances·Yo MachidaKamran Behnia
Jun 27, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·T Mizushima, K Machida
Dec 3, 2016·Physical Review Letters·Takuya Nomoto, Hiroaki Ikeda
Mar 3, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Takeshi MizushimaKazushige Machida

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