Sep, 2015
Ferromagnetic Spin Fluctuation and Unconventional Superconductivity in Rb2Cr3As3 Revealed by As-75 NMR and NQR
PHYSICAL REVIEW LETTERS
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- ,
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- Volume
- 115
- Number
- 14
- First page
- 147002(1)-147002(5)
- Last page
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1103/PhysRevLett.115.147002
- Publisher
- AMER PHYSICAL SOC
We report As-75 nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) studies on the superconductor Rb2Cr3As3 with a quasi-one-dimensional crystal structure. Below T similar to 100 K, the spin-lattice relaxation rate (1/T-1) divided by temperature, 1/T1T, increases upon cooling down to T-c = 4.8 K, 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/T-1 decreases rapidly below T-c without a Hebel-Slichter peak, and follows a T-5 variation below T similar to 3 K, which points to unconventional superconductivity with point nodes in the gap function.
- Link information
- ID information
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- DOI : 10.1103/PhysRevLett.115.147002
- ISSN : 0031-9007
- eISSN : 1079-7114
- Web of Science ID : WOS:000362095300005