Existence of anisotropic spin fluctuations at low temperature in the normal phase of the superconducting ferromagnet UCoGe
Existence of anisotropic spin fluctuations at low temperature in the normal phase of the superconducting ferromagnet UCoGe
复制标题
超导铁磁体UCoGe正相低温下各向异性自旋涨落的存在
DOI：
10.1103/physrevb.89.041108
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Brison JP
中科院分区：
文献类型：
--
作者：
Taupin M;Howald L;Aoki D;Flouquet J;Brison JP
对超导铁磁体UCoGe在磁场作用下的低温热导率进行了测量。除了电子准粒子热导率之外，还检测到对热输运的其他贡献：它们对磁场的幅度和方向敏感，并且在低温下，它们表现出与热流方向的强各向异性。我们确定这些贡献所产生的磁场波动。在三维弱铁磁体的热输运上检测到这种波动是非常罕见的，如果不是唯一的，并保证了UCoGe的磁性的强烈巡回字符。
Thermal conductivity measurements have been performed on the superconducting ferromagnet UCoGe down to very low temperature and under magnetic field. In addition to the electronic quasiparticle thermal conductivity, additional contributions to the thermal transport are detected: they are sensitive to the amplitude and direction of the magnetic field and at low temperature, they display a strong anisotropy with the heat current direction. We identify these contributions as arising from magnetic fluctuations. Detection of such fluctuations on the thermal transport in 3D weak ferromagnets is very rare if not unique and pledges for a strongly itinerant character of the magnetism of UCoGe.