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Crossover in Low-temperature Ground State of Fe(Se,Te) Compounds

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Abstract

We present a comparative study of the transport properties of FeSe\({}_{1-x}\)Te\({}_{x}\) crystals with x in the range of \(0.3-0.4\) and pure FeSe crystals. For all the studied samples, there is an anomaly in \(\rho (T)\) dependence, which apparently corresponds to a structural transition. However, the shape of this anomaly for compounds with \(x\approx 0.3-0.4\) differs significantly from the shape of the anomaly near the nematic transition in pure FeSe. Besides, the resistivity at low temperatures for crystals with \(x\approx 0.3-0.4\) is proportional to the square of the temperature, while for pure FeSe in the temperature range below the structural transition it is almost linearly dependent on temperature. This difference in transport properties indicates a change in the ground state and the existence of a quantum criticality, possibly related to the magnetic and non-magnetic types of electronic ordering. In addition, the phase diagram of FeSe\({}_{1-x}\)Te\({}_{x}\) at low x eventually resembles the part of the well-known phase diagram of FeSe under pressure, where the region of nematic ordering directly borders the region of magnetic ordering.

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Funding

This work has been supported by the Russian Foundation for Basic Research through Grant 20-02-00561A and by the Interdisciplinary Scientific and Educational School of Moscow State University “Photonic and Quantum Technologies. Digital Medicine,” and the research infrastructure of the “Educational and Methodical Center of Lithography and Microscopy,” M.V. Lomonosov, Moscow State University was used. Crystal growth has been supported by the Kazan Federal University Strategic Academic Leadership Program (PRIORITY-2030) and by President Grant to the leading scientific schools of the Russian Federation through Project NSh-2394.2022.1.5. OSV acknowledges the financial support by Russian Science Foundation through the project 22-42-08002. ANV acknowledges the financial support by the Megagrant 075-15-2021-604 of the Government of Russian Federation.

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Authors and Affiliations

  1. Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia

    Y. A. Ovchenkov, O. S. Volkova & A. N. Vasiliev

  2. Institute of Experimental Mineralogy RAS, Chernogolovka, 123456, Russia

    D. A. Chareev

  3. Ural Federal University, Ekaterinburg, 620002, Russia

    D. A. Chareev

  4. Kazan Federal University, Kazan, 420008, Russia

    D. A. Chareev

  5. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, 119991, Russia

    D. E. Presnov

  6. National University of Science and Technology ‘MISIS’, Moscow, 119049, Russia

    O. S. Volkova & A. N. Vasiliev

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  1. Y. A. Ovchenkov
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  2. D. A. Chareev
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Correspondence to Y. A. Ovchenkov.

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Ovchenkov, Y.A., Chareev, D.A., Presnov, D.E. et al. Crossover in Low-temperature Ground State of Fe(Se,Te) Compounds. J Supercond Nov Magn 36, 183–188 (2023). https://doi.org/10.1007/s10948-022-06437-9

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