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    Absence of long-range magnetic order in Fe1−δTe2 (δ ≈ 0.1) crystals

    Jianjun Tian (田建军)1,2,*, V. N. Ivanovski3, M. Abeykoon4, R. M. Martin5, S. Baranets6, C. Martin7, Yu Liu (刘育)1,†, Qianheng Du (杜乾衡)1,8,‡, Aifeng Wang (王爱峰)9 et al.

    Shuzhang Chen (陈漱彰)1,10, Xiao Tong (佟晓)11, Weifeng Zhang (张伟风)2, S. Bobev6, V. Koteski3, and C. Petrovic1,8,10,§

    • 1Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
    • 2Research Center of Topological Functional Materials and Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475004, China
    • 3Department of Nuclear and Plasma Physics, Vinca Institute of Nuclear Sciences, National Institute of the Republic of Serbia, University of Belgrade, 11001 Belgrade, Serbia
    • 4Photon Science Division, National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
    • 5Department of Physics and Astronomy, Montclair State University, Montclair, New Jersey 07043, USA
    • 6Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
    • 7School of Theoretical and Applied Sciences, Ramapo College of New Jersey, Mahwah, New Jersey 07430, USA
    • 8Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11790, USA
    • 9School of Physics, Chongqing University, Chongqing 400044, China
    • 10Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794-3800, USA
    • 11Center of Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA

    • *tjj@henu.edu.cn
    • †Present address: Los Alamos National Laboratory, MS K764, Los Alamos, New Mexico 87545, USA.
    • ‡Present address: Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
    • §petrovic@bnl.gov

    Phys. Rev. B 104, 224109 – Published 27 December, 2021

    DOI: https://doi.org/10.1103/PhysRevB.104.224109

    Abstract

    Transition metal dichalcogenides attract considerable attention due to a variety of interesting properties, including long-range magnetism in nanocrystals. Here we investigate the magnetic, thermal, and electrical properties of an FeTe2 single crystal with iron vacancy defects. Magnetic measurements show a paramagnetic state and the absence of magnetic order with low anisotropy in the magnetic susceptibility. Fe 3d orbitals are well hybridized, contributing to the bad metal electrical resistivity. Observed thermal conductivity values below room temperature are rather low and comparable to those of high-performance thermoelectric materials. Our results indicate that FeTe2 can form in a highly defective marcasite crystal structure which can be exploited in future materials design.

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