Heat Capacity and Mössbauer Study of Self-Flux Grown FeTe Single Crystal
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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.
KeywordsIron-based superconductors FeTe crystal growth Heat capacity Mössbauer spectroscopy
Authors would like to thank the director of NPL-CSIR India for his intense interest in the present work.
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
- 20.Zhang, S.B., Sun, Y.P., Zhu, X.D., Zhu, X.B., Wang, B.S., Li, G., Lei, H.C., Luo, X., Yang, Z.R., Song, W.H., Dai, J.M.: Supercond. Sci. Technol. 22, 050020 (2009)Google Scholar