Anisotropy of the superconducting upper critical field and antiferromagnetism in pressure-induced superconductor CePt2In7

International Conference on Strongly Correlated Electron Systems 2014

Kurahashi, Shuhei^1 ; Ota, Shunpei^1 ; Tomaru, Shun^1 ; Hirose, Yusuke^2 ; Settai, Rikio^2

Graduate School of Science and Technology, Niigata University, Niigata

950-2181, Japan^1

Department of Physics, Niigata University, Niigata

950-2181, Japan^2

关键词: Antiferromagnets;    Critical pressures;    High magnetic fields;    Pressure induced superconductivity;    Tetragonal crystal structure;    Upper critical fields;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012006/pdf
DOI  :  10.1088/1742-6596/592/1/012006

来源: IOP

【 摘 要 】

CePt2In7is an antiferromagnet with TN=5.4K, which shows pressure-induced superconductivity at transition temperature Tc= 2.1 K around a critical pressure Pc=3.2 GPa. We have investigated an anisotropy of the superconducting upper critical field Hc2in CePt2In7, which posesses two-dimensional tetragonal crystal structure and cylindrical Fermi surfaces elongated along c-axis. At 2.60 GPa, initial slope of Hc2for H[001] is smaller than that for H[100], reflecting the two-dimensional Fermi surface of CePt2In7. However, Pauli paramagnetic suppression is strong for H[100] compared with that for H[001] in high magnetic field, and Hc2(0) for H[001] seems to be larger than that for H[100] at 2.60 GPa in CePt2In7.