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Structural and Magnetic Properties of Flux-Free Large FeTe Single Crystal

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Abstract

We report synthesis of non-superconducting parent compound of iron chalcogenide, i.e., FeTe single crystal by self-flux method. The FeTe single crystal is crystallized in a tetragonal structure with the P4/nmm space group. The detailed scanning electron microscopy (SEM) results showed that the crystals are formed in slab-like morphology and are near (slight deficiency of Te) stoichiometric with homogenous distribution of Fe and Te. The coupled structural and magnetic phase transition is seen at around 70 K in both electrical resistivity and magnetization measurements, which is hysteric (ΔT = 5 K) in nature with cooling and warming cycles. Magnetic susceptibility (χ−T) measurements showed the magnetic transition to be of antiferromagnetic in nature, which is substantiated by isothermal magnetization (M-H) plots as well. The temperature-dependent electrical resistivity measured in 10-kOe field in both in-plane and out-of-plane field directions showed that the hysteric width nearly becomes double to ΔT = 10 K and is maximum for the out-of-plane field direction for the studied FeTe single crystal. We also obtained a sharp spike-like peak in heat capacity C p (T) measurement due to the coupled structural and magnetic order phase transitions.

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Acknowledgments

The authors would like to thank their Director NPL-CSIR, India, for his intense interest in the present work. This work is financially supported by a DAE-SRC outstanding investigator award scheme on search for new superconductors. P. K. Maheshwari thanks CSIR, India, for the research fellowship and AcSIR-NPL for the Ph.D. registration.

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Authors and Affiliations

  1. CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi, 110012, India

    P. K. Maheshwari, Rajveer Jha, Bhasker Gahtori & V. P. S. Awana

  2. AcSIR-National Physical Laboratory, New Delhi, 110012, India

    P. K. Maheshwari

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  1. P. K. Maheshwari
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  2. Rajveer Jha
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  3. Bhasker Gahtori
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  4. V. P. S. Awana
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Correspondence to V. P. S. Awana.

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Maheshwari, P.K., Jha, R., Gahtori, B. et al. Structural and Magnetic Properties of Flux-Free Large FeTe Single Crystal. J Supercond Nov Magn 28, 2893–2897 (2015). https://doi.org/10.1007/s10948-015-3173-8

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  • DOI: https://doi.org/10.1007/s10948-015-3173-8

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