Quasi-Two-Dimensional Antiferromagnetic Spin Fluctuations in the Spin-Triplet Superconductor Candidate CeRh2As2

Chen, Tong; Siddiquee, Hasan; Xu, Qiaozhi; Rehfuss, Zack; Gao, Shiyuan; Lygouras, Chris; Drouin, Jack; Morano, Vincent; Avers, Keenan E.; Schmitt, Christopher J.; Podlesnyak, Andrey; Paglione, Johnpierre; Ran, Sheng; Song, Yu; Broholm, Collin

doi:10.1103/physrevlett.133.266505

Title: Quasi-Two-Dimensional Antiferromagnetic Spin Fluctuations in the Spin-Triplet Superconductor Candidate CeRh₂As₂

Journal Article · 30 December 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.133.266505 · OSTI ID:2491434

^[1]; Siddiquee, Hasan ^[2]; Xu, Qiaozhi ^[2];

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^[3]; Schmitt, Christopher J. ^[4];

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Johns Hopkins Univ., Baltimore, MD (United States)
Washington Univ., St. Louis, MO (United States)
Univ. of Maryland, College Park, MD (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Zhejiang Univ., Hangzhou (China)

The tetragonal heavy-fermion superconductor CeRh₂⁢As₂ (T_c = 0.3 K) exhibits an exceptionally high critical field of 14 T for B ∥ c. It undergoes a field-driven first-order phase transition between superconducting states, potentially transitioning from spin-singlet to spin-triplet superconductivity. To further understand these superconducting states and the role of magnetism, we probe spin fluctuations in CeRh₂⁢As₂ using neutron scattering. Here, we find dynamic (π, π) antiferromagnetic (AFM) spin correlations with an anisotropic quasi-two-dimensional correlation volume. Our data place an upper limit of 0.31 μ_B on the staggered magnetization of corresponding Néel orders at T = 0.08 K. Density functional theory calculations, treating Ce 4⁢ƒ electrons as core states, show that the AFM wave vector connects significant areas of the Fermi surface. Our findings indicate that the dominant excitations in CeRh₂⁢As₂ for ℏω⁢ < 1.2 meV are magnetic and suggest that superconductivity in CeRh_2⁢As₂ is mediated by AFM spin fluctuations associated with a proximate quantum critical point.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation (GBMF); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725; SC0019154; SC0019331; SC0024469

OSTI ID:: 2491434

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 133; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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