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Spin Gap in β-TeVO4: a Quantum Monte Carlo Study

  • Condensed Matter
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Abstract

In this paper, we proposed a two-leg spin ladder model for the description of magnetic properties of the β-TeVO4 compound. Quantum Monte Carlo (QMC) simulation was applied to describe the temperature-dependent magnetic susceptibility data for low temperatures. The two-leg spin ladder model presents a spin gap, and we suggests that β-TeVO4 compound presents such a spin gap also, and therefore, the model proposed here can be experimentally tested by measuring the spin gap of the compound. The susceptibility phase diagram has a rounded peak in the vicinity of T ≈ 12.2 K and obeys Troyer’s law for low temperatures and Curie’s law for high temperatures. We also study the susceptibility diagram in low temperatures and found the spin gap Δ = 8.06 K. The linearization of the equation for susceptibility in low temperatures allows us to obtain the spin gap value, and such a linearization was made with the data from the QMC simulation. In all the results, there is a very good agreement with the experimental data. We also show that the spin gap is null and the susceptibility is proportional to T for low temperatures when relatively high values of the ladders’ coupling is considered. The theoretical results are compared with other studies as well as applied to describe the susceptibility phase diagram of consolidated spin ladder compound, C9H18N2CuBr4.

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Acknowledgments

We would like to thank the anonymous referees for very helpful comments and suggestions.

Funding

This work was supported by the following Brazilian financial agencies: Capes, Petrobras, CNPq, Fapitec, and PAP-PQ/IFTO.

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Authors and Affiliations

  1. Coordenadoria de Licenciatura em Física, Instituto Federal de Sergipe, Lagarto, SE, 49400-000, Brazil

    Augusto S. Freitas

  2. Coordenadoria de Eletromecânica, Instituto Federal de Sergipe, Lagarto, SE, 49400-000, Brasil

    Michael S. Reis & J. Espínola

  3. Departamento Física, Universidade Federal do Recôncavo Baiano, Araguaína, BA, Brasil

    M. A. Gomes

  4. Departamento de Física, Universidade Federal do Tocantins, Araguaína, TO, CEP 77824-838, Brasil

    C. A. da Silva

  5. Coordenação de Pesquisa e Extensão, Instituto Federal do Tocantins, Colinas do Tocantins, TO, 77760-000, Brazil

    L. S. Silva

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  1. Augusto S. Freitas
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  2. Michael S. Reis
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  3. J. Espínola
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  4. M. A. Gomes
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Correspondence to L. S. Silva.

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Freitas, A.S., Reis, M.S., Espínola, J. et al. Spin Gap in β-TeVO4: a Quantum Monte Carlo Study. Braz J Phys 50, 225–229 (2020). https://doi.org/10.1007/s13538-020-00739-w

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