Magnetic entropy of UTe

Opletal, P.; 酒井 宏典; 芳賀 芳範; 山本 悦嗣; 神戸 振作; 徳永 陽; 常盤 欣文

no journal, , 

Recently rediscovered orthorhombic UTe exhibits superconductivity at low temperatures below 2 K. The origin of superconductivity is still unknown even though its properties were investigated by different techniques and reported in literature. The origin of superconductivity could be found by investigating physical properties at temperatures above superconductivity. Existence of ferromagnetic fluctuations along the -axis was suggested based on thermodynamic and transport measurements while antiferromagnetic fluctuations were found by inelastic neutron scattering along the -axis. We investigate magnetic properties for all crystallographic axes in fields up to 7 T and temperature interval from 2 K up to 60 K. The obtained data are than evaluated by Maxwell relations between entropy and magnetization to obtain change of magnetic part of entropy in T-H diagram. The entropy for field along the -axis show ferromagnetic behavior with unusual behavior below ~ 7 K, while for field along the -axis we observe antiferromagnetic-like behavior. We discuss our results with consideration of results in literature and propose possible scenarios. The results obtained on superconducting sample are compared to non-superconducting