Antiferromagnetic spin fluctuations and superconductivity in NbRh2B2 and TaRh2B2 with a chiral crystal structure
Kazuaki Matano, Ryo Ogura, Mateo Fountaine, Harald O. Jeschke, Shinji Kawasaki, Guo-qing Zheng
DOI 10.1103/PhysRevB.104.224508 · Physical Review B
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Abstract
We report the B11 nuclear magnetic resonance measurements on noncentrosymmetric superconductors NbRh2B2 (superconducting transition temperature Tc=7.8 K) and TaRh2B2 (Tc=5.9 K) with a chiral crystal structure. The nuclear spin-lattice relaxation rate 1/T1 shows no coherence peak below Tc, which suggests the unconventional nature of the superconductivity. In the normal state, 1/T1T increases with decreasing temperature T at low temperatures below T=200 K for TaRh2B2 and T=15 K for NbRh2B2, while the Knight shift remains constant. These results suggest the presence of antiferromagnetic spin fluctuations in both compounds. The stronger spin fluctuations in TaRh2B2 compared to NbRh2B2 is discussed in the context of spin-orbit coupling.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbRh2B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | onset |
| TaRh2B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.9 | Pressure not reported | onset |
| NbRh2B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.6 | Pressure not reported | onset |
| TaRh2B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.8 | Pressure not reported | onset |
| Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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