Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.20: Poster
Mittwoch, 28. März 2012, 15:00–19:00, Poster B
Noise spectroscopy of superconducting systems δ′-FeSe and FeSe0.5Te0.5 — •Adham Amyan1, Amir-Abbas Haghighirad1, Pintu Das1, Sahana Rößler2, Steffen Wirth2, Dona Cherian3, Suja Elizabeth3, Wolf Aßmus1, and Jens Müller1 — 1Physikalisches Institut, Goethe-Universität Frankfurt, Frankfurt am Main, Germany — 2Max-Planck-Institute for Chemical Physics of Solids, Dresden, Germany — 3Dep. of Physics, Indian Institute of Science, Bangalore, India
One of the most recent interesting and surprising phenomena is superconductivity in Fe-based compound (i.e. pnictides and chalcogenides), where FeSe has the most simple structure of the diverse family of these materials. The FeSe1−xTex system shows superconductivity up to Tc∼ 14 K. The Fe planar structure may be crucial for understanding the mechanism of superconductivity in these systems: it was suggested that a low temperature structural distortion is closely associated with the superconductiing properties of this material [1].
We employ fluctuation (noise) spectroscopy to study the intrinsic charge carriers dynamics and their correlation with the structural properties. In both superconducting compounds δ′-FeSe and FeSe0.5Te0.5 we observe a maximum in the normalized noise power spectral density at 107 K and 110 K respectively, where a structural transition from tetragonal to orthorhombic occurs [2].
M. J. Wang et al, PRL 103, 117002 (2009)
M. de Souza et al, Eur. Phys. J. B 77, 101-107 (2010)