TY - JOUR
T1 - Ferromagnetic Spin Fluctuation and Unconventional Superconductivity in Rb2Cr3As3 Revealed by As 75 NMR and NQR
AU - Yang, J.
AU - Tang, Z. T.
AU - Cao, G. H.
AU - Zheng, Guo Qing
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/9/29
Y1 - 2015/9/29
N2 - We report As75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies on the superconductor Rb2Cr3As3 with a quasi-one-dimensional crystal structure. Below T∼100K, the spin-lattice relaxation rate (1/T1) divided by temperature, 1/T1T, increases upon cooling down to Tc=4.8K, showing a Curie-Weiss-like temperature dependence. The Knight shift also increases with decreasing temperature. These results suggest ferromagnetic spin fluctuation. In the superconducting state, 1/T1 decreases rapidly below Tc without a Hebel-Slichter peak, and follows a T5 variation below T∼3K, which points to unconventional superconductivity with point nodes in the gap function.
AB - We report As75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies on the superconductor Rb2Cr3As3 with a quasi-one-dimensional crystal structure. Below T∼100K, the spin-lattice relaxation rate (1/T1) divided by temperature, 1/T1T, increases upon cooling down to Tc=4.8K, showing a Curie-Weiss-like temperature dependence. The Knight shift also increases with decreasing temperature. These results suggest ferromagnetic spin fluctuation. In the superconducting state, 1/T1 decreases rapidly below Tc without a Hebel-Slichter peak, and follows a T5 variation below T∼3K, which points to unconventional superconductivity with point nodes in the gap function.
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U2 - 10.1103/PhysRevLett.115.147002
DO - 10.1103/PhysRevLett.115.147002
M3 - Article
AN - SCOPUS:84944111644
VL - 115
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 14
M1 - 147002
ER -