Electronic properties of single-crystalline Fe$_{1.05}$Te and Fe$_{1.03}$Se$_{0.30}$Te$_{0.70}$

Details Electronic properties of single-crystalline Fe$_{1.05}$Te and Fe$_{1.03}$Se$_{0.30}$Te$_{0.70}$ Electronic properties of single-crystalline Fe$_{1.05}$Te and Fe$_{1.03}$Se$_{0.30}$Te$_{0.70}$

2008-11-10

arxiv.org/abs/0811.1489v1

Phys. Rev. B 79, 140509(R) (2009)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We report on a comprehensive study of the transport, specific heat, magnetic susceptibility and optical spectroscopy on single crystal of Fe$_{1.05}$Te. We confirm that Fe$_{1.05}$Te undergoes a first-order phase transition near 65 K. However, its physical properties are considerably different from other parent compounds of FeAs-based systems, presumably attributed to the presence of excess Fe ions. The charge transport is rather incoherent above the transition, and no clear signature of the gap is observed below the transition temperature. Strong impurity scattering effect exists also in Se-doped superconducting sample Fe$_{1.03}$Se$_{0.30}$Te$_{0.70}$, leading to a relatively low T$_c$ but a rather high upper critical field.

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