Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 79: Superconductivity: Fe-based Superconductors - 122

TT 79.11: Vortrag

Donnerstag, 10. März 2016, 18:15–18:30, H21

Electrical transport properties of the unconventional superconductor YFe₂Ge₂ — •Konstantin Semeniuk¹, Jiasheng Chen¹, Zhuo Feng², Philip Brown¹, Yang Zou¹, Giulio Lampronti³, and Malte Grosche¹ — ¹Cavendish Laboratory, University of Cambridge, Cambridge UK — ²London Centre of Nanotechnology, University College London, London UK — ³Dept. of Earth Sciences, University of Cambridge, Cambridge UK

YFe₂Ge₂ is a paramagnetic d-electron system which stands out due to its high Sommerfeld ratio of its specific heat capacity of 100 mJ/(mol K²) and non Fermi-liquid T^3/2 power law temperature dependence of the electrical resistivity. The material was found to be superconducting below about 1.8 K [1].

Advances in YFe₂Ge₂ crystal growth allowed us to obtain high quality samples with residual resistivity ratios of the order of 200. Recent measurements of magnetisation and heat capacity provide further evidence for superconductivity, and the correlation between the transition temperature and the sample quality, the enhanced Sommerfeld coefficient and the anomalous T-dependence of the resistivity indicate that superconductivity in YFe₂Ge₂ is unconventional [2]. We report the results of detailed electrical resistivity measurements on YFe₂Ge₂ as a function of temperature, magnetic field and hydrostatic pressure, which provide further insight into the nature of superconducting and normal states of the material.
Y. Zou et al., Physica Status Solidi (RRL) 8, 928 (2014).
J. Chen et al., arXiv:1507.01436v2.