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 Wirth1 — 1Max 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 I−V characteristics of the STM measurements.
S. Rößler et al., Phys. Rev. B, 82 (2010) 144523.