National High Magnetic Field Laboratory, 1800 E. Paul Dirac Dr, Tallahassee, Florida 32310-3706, USA.
1] National High Magnetic Field Laboratory, 1800 E. Paul Dirac Dr, Tallahassee, Florida 32310-3706, USA [2] Department of Physics, Florida State University, 77 Chieftan Way, Tallahassee, Florida 32306-4350, USA.
Nat Commun. 2015 Mar 11;6:6518. doi: 10.1038/ncomms7518.
Bogolyubov quasiparticles move in a practically uniform magnetic field in the vortex state of high-temperature cuprate superconductors. When set in motion by an externally applied heat current, the quasiparticles' trajectories may bend, causing a temperature gradient perpendicular to the heat current and the applied magnetic field, resulting in the thermal Hall effect. Here we relate this effect to the Berry curvature of quasiparticle magnetic sub-bands, and calculate the dependence of the intrinsic thermal Hall conductivity on superconductor's temperature, magnetic field and the amplitude of the d-wave pairing. The intrinsic contribution to thermal Hall conductivity displays a rapid onset with increasing temperature, which compares favourably with existing experiments at high magnetic field on the highest purity samples. Because such temperature onset is related to the pairing amplitude, our finding may help to settle a much-debated question of the bulk value of the pairing strength in cuprate superconductors in magnetic field.
玻戈留波夫准粒子在高温铜氧化物超导体的涡旋态中在近乎均匀的磁场中运动。当外部施加热流使其运动时，准粒子的轨迹可能会弯曲，导致垂直于热流和外加磁场的温度梯度，从而产生热霍尔效应。在这里，我们将这种效应与准粒子磁子带的贝里曲率联系起来，并计算了本征热霍尔电导率对超导体温度、磁场和 d 波配对振幅的依赖关系。本征热霍尔电导率随温度的升高呈快速上升，与在最高纯度样品上磁场较高时的现有实验结果相比非常吻合。由于这种温度起始与配对幅度有关，我们的发现可能有助于解决在磁场中铜氧化物超导体的配对强度的体值的一个备受争议的问题。
