Heavy Fermion Superconductor Ce2PdIn8 studied by 115In Nuclear Quadrupole Resonance

10th International Conference on Materials and Mechanisms of Superconductivity

Fukazawa, H.^1 ; Nagashima, R.^1 ; Shimatani, S.^1 ; Kohori, Y.^1 ; Kaczorowski, D.^2

Department of Physics, Graduate School of Science, Chiba University, Chiba 263-8522, Japan^1

Institute of Low Temperature and Structure Research, Polish Academy of Sciences, PO Box 1410, PL-50-950 Wroclaw, Poland^2

关键词: Antiferromagnetics;    Coherence peaks;    Fermi liquid behavior;    Nuclear quadrupole resonance measurements;    Quantum critical points;    Spin lattice relaxation rates;    Superconducting critical temperatures;    Unconventional superconductivity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/449/1/012027/pdf
DOI  :  10.1088/1742-6596/449/1/012027

来源: IOP

【 摘 要 】

We have performed nuclear quadrupole resonance (NQR) measurements on a recently-discovered heavy-fermion superconductor Ce2PdIn8 with superconducting critical temperature Tc 0.64 K. Below coherent temperature Tcoh ∼ 30 K, the spin-lattice relaxation rate 1/T1 decreases with decreasing temperature T and is proportional to T1/2between Tc and Tcoh. This is clearly different from the Fermi-liquid behavior in which the T dependence is proportional to T, and indicates that Ce2PdIn8 is located on the verge of antiferromagnetic quantum critical point from the view point of the NQR. Below Tc, 1/T1 shows no coherence peak and is proportional to T3. This is clear evidence for the realization of unconventional superconductivity with line nodes in this compound.