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Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.29: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Electronic properties across the first-order phase transition in Fe1.05Te — •Sahana Rößler1, Dona Cherian2, Sasidharan Harikrishnan2, Handadi L. Bhat2, Suja Elizabeth2, John A. Mydosh3, Frank Steglich1, and Steffen Wirth11Max Planck Institute for Chemical Physics of Solids, Nöthnizer Straße 40, 01187, Dresden, Germany — 2Department of Physics, Indian Institute of Science, Bangalore 560012, India — 3Kamerlingh Onnes Laboratory, Leiden University, P. O. Box 9504, 2300 RA Leiden, The Netherlands

We present scanning tunneling microscopy and spectroscopic (STM/S) studies on Fe1.05Te single crystals. In this compound, the superconductivity appears upon Se doping and the physical properties are found to be extremely sensitive to non-stoichiometry and disorder [1]. In our FeTe crystals, a first-order phase transition is observed around 57 K in the resistivity, magnetization, and the specific heat measurements. This transition is associated with a structural transition from a tetragonal P4/nmm to a monoclinic P21/m space group. At this temperature, the compound becomes antiferromagnetically ordered and the temperature dependence of the resistivity changes from log (−T) to T2. This observation suggests that the material behaves as a Fermi-liquid metal at low temperatures. Metallic behavior is also confirmed by the IV characteristics of the STM measurements.
S. Rößler et al., Phys. Rev. B, 82 (2010) 144523.

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