Single-ion properties of the transverse-field Ising model material CoNb2O6

Ringler, J. A.; Kolesnikov, A. I.; Ross, K. A.

doi:10.1103/physrevb.105.224421

Title: Single-ion properties of the transverse-field Ising model material CoNb₂O₆

Journal Article · 27 June 2022 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.105.224421 · OSTI ID:1876266

^[1];

^[2]; Ross, K. A. ^[3]

Colorado State University, Fort Collins, CO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Colorado State University, Fort Collins, CO (United States); Canadian Institute for Advanced Research, Toronto (Canada)

We report CoNb₂O₆ is one of the few materials that is known to approximate the one-dimensional transverse-field Ising model (1D-TFIM) near its quantum critical point. It has been inferred that Co²⁺ acts as a pseudospin 1/2 with anisotropic exchange interactions that are largely Ising-like, enabling the realization of the TFIM. However, the behavior of CoNb₂O₆ is known to diverge from the ideal TFIM under transverse magnetic fields that are far from the quantum critical point, requiring the consideration of additional anisotropic, bond-dependent (Kitaev-like) terms in the microscopic pseudospin-1/2 Hamiltonian. These terms are expected to be controlled in part by single-ion physics, namely the wave function for the pseudospin-1/2 angular momentum doublet. Here, we present the results of both inelastic neutron scattering measurements and electron paramagnetic resonance spectroscopy on CoNb₂O₆, which elucidate the single-ion physics of Co²⁺ in CoNb₂O₆ for the first time. We find that the system is well-described by an intermediate spin-orbit coupled Hamiltonian, and the ground state is a well-isolated Kramers doublet with an anisotropic g tensor. We provide the approximate wave functions for this doublet, which we expect will be useful in theoretical investigations of the anisotropic exchange interactions.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0018972

OSTI ID:: 1876266

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 22 Vol. 105; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Single-ion properties of the transverse-field Ising model material CoNb₂O₆