论文标题
在强相关超导体UTE2的元磁过渡时Fermi-Surface重建的证据
Evidence of Fermi-Surface Reconstruction at the Metamagnetic Transition of the Strongly Correlated Superconductor UTe2
论文作者
论文摘要
报告了沿硬磁场$ b $轴的磁场，热电功率（$ s $）和霍尔效应（$ r_ \ mathrm {h} $）测量在磁场上使用磁场。 $ h_ \ mathrm {m} = h^b_ \ mathrm {c2} = 35 $ 〜t的第一阶性质在$ s $和$ s $和$ r_ \ mathrm {h h} $上产生巨大后果。与通过$ h_ \ mathrm {m} $，$ s（h）$在正常状态下特定热量的场依赖性相反，与$ h_ \ mathrm {m {m} $不对称。这意味着在$ h_ \ mathrm {m} $上的Ferromagnetic（FM）波动与Fermi-Surface重建之间存在很强的相互作用。 $ r_ \ mathrm {h} $很好地描述了连贯温度高于连贯温度$ t_ \ mathrm {m} $的散射，大致对应于易感性的最高温度$ t_ {χ_\ mathrm {max max}}} $ and coerhent skew skew skew sekew sekew sekew seking sekew spepations seking seking specters severting。两者，$ s（h）$和普通霍尔系数$ r_0 $，$ h_ \ mathrm {m} $且在低温下的不连续场依赖性提供了福特级别频段结构发生变化的证据。
Thermoelectric power ($S$) and Hall effect ($R_\mathrm{H}$) measurements on the paramagnetic superconductor UTe$_2$ with magnetic field applied along the hard magnetization $b$-axis are reported. The first order nature of the metamagnetic transition at $H_\mathrm{m}=H^b_\mathrm{c2}=35$~T leads to drastic consequences on $S$ and $R_\mathrm{H}$. In contrast to the field dependence of the specific heat in the normal state through $H_\mathrm{m}$, $S(H)$ is not symmetric with respect to $H_\mathrm{m}$. This implies a strong interplay between ferromagnetic (FM) fluctuations and a Fermi-surface reconstruction at $H_\mathrm{m}$. $R_\mathrm{H}$ is very well described by incoherent skew scattering above the coherence temperature $T_\mathrm{m}$ corresponding roughly to the temperature of the maximum in the susceptibility $T_{χ_\mathrm{max}}$ and coherent skew scattering at lower temperatures. The discontinuous field dependence of both, $S(H)$ and the ordinary Hall coefficient $R_0$, at $H_\mathrm{m}$ and at low temperature, provides evidence of a change in the band structure at the Fermi level.
