论文标题
特异性热对铁磁超导体UCOGE的各向异性场响应在磁场中
Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields
论文作者
论文摘要
磁场角度分辨的比热和磁化测量值是在具有明显各向异性上临界场$ H _ {\ rm C2} $的铁磁超导体Ucoge上进行的。尽管$ h _ {\ rm c2} $沿着$ b $轴沿$ b $轴达到高磁场（$ \ sim 20 $ 〜t），但是当沿着磁场沿着磁性易于$ c $ ac轴应用磁场时，它很小（$ \ sim〜0.6 $ 〜t）。这项研究表明，当磁场从$ a $ a $ a $ a $ a $ a $ a $ a $ a $ a $ a $ a $和$ b $轴的磁场应用于铁磁状态时，特定的热量突然被抑制。状态密度（DOS）的场响应是各向异性的，相对于$ c $轴，其角度依赖性略有奇异。铁磁性状态的Ising型磁各向异性即使在各向异性增强的超导状态下也是主要的。这些事实表明，DOS的抑制可能与超导状态密切相关。从理论上讲，我们将这些发现与Urhge和Ute $ _2 $一起分析了这些发现，从而突出了三种化合物之间的常见和独特功能。
Magnetic-field-angle-resolved specific heat and magnetization measurements were conducted on a ferromagnetic superconductor UCoGe with remarkable anisotropic upper critical field $H_{\rm c2}$. Although $H_{\rm c2}$ reaches a high magnetic field ($\sim 20$~T) along the $b$ axis, it is small ($\sim~0.6$~T) when a magnetic field is applied along the magnetic easy $c$-axis. This study indicates that the specific heat is abruptly suppressed when the magnetic field is applied toward the $c$ axis from the $a$ and $b$ axes in the ferromagnetic state. The field response of density of states (DOS) is anisotropic, relative to the $c$ axis, and its angle dependence is slightly singular. The Ising-type magnetic anisotropy of the ferromagnetic state is dominant even in the anisotropic reinforced superconducting state. These facts indicate that the suppression of DOS may closely relate to the superconducting state. We theoretically analyze these findings together with URhGe and UTe$_2$ by highlighting the common and distinctive features among three compounds.
