Antiferromagnetic spin fluctuations and superconductivity in NbRh$_2$B$_2$ and TaRh$_2$B$_2$ with a chiral crystal structure

Kazuaki Matano; Ryo Ogura; Mateo Fountainea; Harald O. Jeschke; Shinji Kawasaki; Guo-qing Zheng

doi:10.1103/PhysRevB.104.224508

paper

Antiferromagnetic spin fluctuations and superconductivity in NbRh $_{2}$ B $_{2}$ and TaRh $_{2}$ B $_{2}$ with a chiral crystal structure

arXiv:2110.04958 · doi:10.1103/PhysRevB.104.224508

Abstract

We report the $^{11}$ B nuclear magnetic resonance (NMR) measurements on non-centrosymmetric superconductors NbRh $_{2}$ B $_{2}$ (superconducting transition temperature $T_{c}$ = 7.8 K) and TaRh $_{2}$ B $_{2}$ ( $T_{c}$ = 5.9 K) with a chiral crystal structure. The nuclear spin-lattice relaxation rate $1/ T_{1}$ shows no coherence peak below $T_{c}$ , which suggests unconventional nature of the superconductivity. In the normal state, $1/ T_{1} T$ increases with decreasing temperature $T$ at low temperatures below $T$ = 200 K for TaRh $_{2}$ B $_{2}$ and $T$ = 15 K for NbRh $_{2}$ B $_{2}$ , while the Knight shift remains constant. These results suggest the presence of antiferromagnetic spin fluctuations in both compounds. The stronger spin fluctuations in TaRh $_{2}$ B $_{2}$ compared to NbRh $_{2}$ B $_{2}$ is discussed in the context of spin-orbit coupling.

arXiv comment19 pages, 10 figures

Antiferromagnetic spin fluctuations and superconductivity in NbRh $_{2}$ B $_{2}$ and TaRh $_{2}$ B $_{2}$ with a chiral crystal structure

Abstract

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Antiferromagnetic spin fluctuations and superconductivity in NbRh2​B2​ and TaRh2​B2​ with a chiral crystal structure

Abstract

References in corpus (34)

Cited by in corpus (2)

Antiferromagnetic spin fluctuations and superconductivity in NbRh $_{2}$ B $_{2}$ and TaRh $_{2}$ B $_{2}$ with a chiral crystal structure