Candidate spin-liquid ground state in CsNdSe2 with an effective spin-1/2 triangular lattice

Xing, Jie; Mu, Sai; Choi, Eun Sang; Jin, Rongying

doi:10.1038/s43246-024-00483-7

Title: Candidate spin-liquid ground state in CsNdSe₂ with an effective spin-1/2 triangular lattice

Journal Article · 04 April 2024 · Communications Materials

DOI: https://doi.org/10.1038/s43246-024-00483-7 · OSTI ID:2337802

Xing, Jie ^[1]; Mu, Sai ^[2]; Choi, Eun Sang ^[3];

^[2]

Univ. of South Carolina, Columbia, SC (United States); University of South Carolina
Univ. of South Carolina, Columbia, SC (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)

Rare-earth-based triangular lattice materials are extremely attractive for studying unconventional magnetism. Here, we report the magnetic properties of layered CsNdSe₂ based on direct current (DC) and alternating current (AC) susceptibility measurements down to 0.04 K. While the AC susceptibility at the zero DC field shows a broad hump below 0.5 K, there is no sign of any long-range magnetic ordering. Quantitative analysis of the DC magnetic susceptibility gives the negative Curie-Weiss (CW) temperature θ_CW < 0 in all directions, indicating antiferromagnetic interaction between Nd ions. Of particular interest is the low temperature magnetic susceptibility, which reflects the effective spin-1/2 state with $$\theta^a_{\text {cw}}/\theta^c_{\text {cw}}$$ > 3. The estimated exchange interactions are J_a/k_B= 1.42 K (in-plane) and J_c/k_B= 0.44 K (out-of-plane), pointing to the anisotropic magnetism. First-principles calculations that include spin-orbit coupling and Coulomb correlations reveal multiple states with zero net magnetization for CsNdSe₂. Both experiment and simulation strongly suggest CsNdSe₂ has the spin liquid ground state with effective spin-1/2. Application of a magnetic field can induce long-range antiferromagnetic ordering with the maximum transition temperature around 0.3 K, in further support of the zero-field spin liquid state.

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Research Organization:: Univ. of South Carolina, Columbia, SC (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: SC0024501

OSTI ID:: 2337802

Journal Information:: Communications Materials, Journal Name: Communications Materials Journal Issue: 1 Vol. 5; ISSN 2662-4443

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Candidate spin-liquid ground state in CsNdSe₂ with an effective spin-1/2 triangular lattice