Enhancement of Tc in CeIr(In1_xCdx)5 studied by In-NQR

International Conference on Strongly Correlated Electron Systems 2016

Yashima, Mitsuharu^1 ; Tani, Kyohei^1 ; Nishimoto, Kazuhiro^1 ; Mukuda, Hidekazu^1 ; Kitaoka, Yoshio^1 ; Honda, Fuminori^2 ; Settai, Rikio^3 ; O'Nuki, Yoshichika^4

Graduate School of Engineering Science, Osaka University, Osaka, Toyonaka

560-8531, Japan^1

Institute for Materials Research, Tohoku University, Oarai, Ibaraki

311-1313, Japan^2

Department of Physics, Niigata Univ., Ikarashi, Niigata

950-2181, Japan^3

Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus, Nishihara, Okinawa

903-0213, Japan^4

关键词: Ambient pressures;    Antiferromagnetic orderings;    Cd-doped;    Density of state;    Measurements of;    Nuclear spin lattice relaxation rate;    Strong coupling;    Superconducting gaps;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/5/052004/pdf
DOI  :  10.1088/1742-6596/807/5/052004

来源: IOP

【 摘 要 】

We report on superconducting nature under pressure in CeIr(In1-xCdx)5by In-Nuclear-Quadrupole-Resonance (NQR) studies. In CeIr(In0.925Cd0.075)5, the inhomogeneous antiferromagnetic order at TN∼ 2.3 K is induced by Cd-dopants and superconductivity disappears at ambient pressure. However, the measurements of a nuclear-spin-lattice-relaxation rate 1/T1have revealed that the superconductivity suddenly occurs above 2.1 GPa. It is observed that the superconducting gap is enhanced in the Cd-doped sample, indicating that the Cd-doping induces the strong coupling superconductivity leading to the enhancement of Tcin the CeIrIn5system. Furthermore, we found that the residual density of states at the Fermi level increases with increasing pressure, suggesting that the superconducting nature of CeIrIn5is quite different from those of CeCoIn5and CeRhIn5.