期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 78, 期 11, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.113709
关键词
unconventional superconductivity; spin-triplet state; upper critical field; quantum criticality; effective mass; ferromagnetism; UCoGe
资金
- French ANR
Magnetoresistivity measurements with fine tuning of the field direction on high quality single crystals of the ferromagnetic superconductor UCoGe show anomalous anisotropy of the upper critical field H-c2. H-c2 for H parallel to b-axis (H-c2(b)) in the orthorhombic crystal structure is strongly enhanced with decreasing temperature with an S-shape and reaches nearly 20 T at 0 K. The temperature dependence of H-c2(a) shows upward curvature with a low temperature value exceeding 30 T, while upward curvature with a low temperature value exceeding 30 T, while H-c2(a) at OK is very small H-c2(c) at 0K is very small (similar to 0.6T). Contrary to conventional ferromagnets, the decrease of the Curie temperature with increasing field for H parallel to b-axis marked by an enhancement of the effective mass of the conduction electrons appears to be the origin of the S-shaped H-c2(b) curve. These results indicate that the field-induced ferromagnetic instability or magnetic quantum criticality reinforces superconductivity.
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