Local States of Tellurium in Isolated Helical Chains

J. Staneka, P. Fornalb, S.S. Hafnerc and A. Pfitznerd aInstitute of Physics, Jagiellonian University of Cracow, Reymonta 4, 30-059 Cracow, Poland bInstitute of Physics, Technical University of Cracow, 30-084 Cracow, Poland cCenter of Materials Sciences, University of Marburg, 35032 Marburg, Germany dDepartment of Inorganic Chemistry, University of Siegen, Germany

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The local electronic state of Te in the helical chains of CuXY2(1-x)Te2x (X = Cl, Br; Y = Se, S) were studied using the Mössbauer spectroscopy of 125Te at 10 K and 70 K. The isolated chains of Te in these compounds are less rigid than those in elemental Te. The determined data of quadrupole splitting Δ and Debye temperature ΘD are indicative of strong local ordering of Te in one of the two non-equivalent crystallographic positions. It was not possible to resolve crystallographic positions by the Mössbauer spectroscopy.

DOI: 10.12693/APhysPolA.100.807 PACS numbers: 76.80.+y