Observation of lattice softening at $T_{\rm c}$ in the FeSe$_{0.5}$Te$_{0.5}$ superconductor

Details Observation of lattice softening at $T_{\rm c}$ in the FeSe$_{0.5}$Te$_{0.5}$ superconductor Observation of lattice softening at $T_{\rm c}$ in the FeSe$_{0.5}$Te$_{0.5}$ superconductor

2010-08-10

arxiv.org/abs/1008.1680v1

Physics

Condensed Matter

Superconductivity

6 figures

Scientific paper

Polycrystalline samples of FeSe$_{0.5}$Te$_{0.5}$ were synthesized using a conventional solid-state reaction method. The onset of bulk superconductivity transition was confirmed by SQUID magnetometry at 12.5~K. $^{57}$Fe M\"ossbauer spectra in transmission geometry were recorded at temperatures between 6.0 and 320 K. Both the isomer shift and the total absorption started to drop about $T_c$, indicating a softening of the lattice. The drop is estimated to correspond to at least 60~K from the original Debye temperature $\theta_{\rm D}\approx 460$~K. Seebeck measurements indicate that the samples are $n$-type conductors at low temperatures with a cross-over to $p$-type conductivity around 135 K. The zero Seebeck coefficient is seen below $10.6$~K.

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