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Heat Capacity and Mössbauer Study of Self-Flux Grown FeTe Single Crystal

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Abstract

We report mainly the heat capacity and Mössbauer study of self-flux grown FeTe single crystal, which is a ground state compound of the Fe chalcogenides superconducting series i.e. FeTe1−x(Se/S) x The as grown FeTe single crystal is large enough to the tune of a few centimetres and the same crystallizes in tetragonal structure having space group of P4/nmm. FeTe shows the structural/magnetic phase transition at 70 K in both magnetic and resistivity measurements. Heat capacity measurement also confirms the coupled structural/magnetic transition at the same temperature. The Debye model fitting of low temperature (below 70 K) heat capacity exhibited Debye temperature (𝜃 D ) to be 324 K. Mössbauer spectra are performed at 300 and 5 K. The 300-K spectra showed two paramagnetic doublets and the 5-K spectra exhibited hyperfine magnetic sextet with an average hyperfine field of 10.6 Tesla matching with the results of Yoshikazu Mizuguchi et al.

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Acknowledgements

Authors would like to thank the director of NPL-CSIR India for his intense interest in the present work.

Funding

This research work is financially supported by the DAESRC outstanding investigator award scheme on search for new superconductors. P.K. Maheshwari also thanks CSIR, India for his research fellowship and AcSIR-NPL for his 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 & V. P. S. Awana

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

    P. K. Maheshwari

  3. UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore, 425001, India

    V. Raghavendra Reddy

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  1. P. K. Maheshwari
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  2. V. Raghavendra Reddy
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  3. V. P. S. Awana
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Correspondence to V. P. S. Awana.

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Maheshwari, P.K., Reddy, V.R. & Awana, V.P.S. Heat Capacity and Mössbauer Study of Self-Flux Grown FeTe Single Crystal. J Supercond Nov Magn 31, 1659–1663 (2018). https://doi.org/10.1007/s10948-018-4649-0

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