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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Fe-based Superconductors

TT 34.5: Vortrag

Mittwoch, 29. März 2023, 12:30–12:45, HSZ 103

The low-temperature specific heat and thermal expansion of YFe2Ge2 — •Pavlo Khanenko1,2, Jiasheng Chen2, Jacintha Banda1, Thomas Luehmann1, F. Malte Grosche2, and Manuel Brando11Max Planck Institute for Chemical Physics of Solids, Germany — 2Cavendish Laboratory, University of Cambridge, Cambridge, UK

We present specific heat and thermal expansion coefficient measurements of the layered iron-based superconductor YFe2Ge2 down to 40 mK and in magnetic field. A new generation of crystals [1] with residual resistivity ratios larger than 500 and Tc = 1.2 K have been investigated. These crystals display a sharp superconducting anomaly in both specific heat and thermal expansion. From the jump magnitudes and using the Ehrenfest relation we derive a small positive pressure dependence of Tc, dTc/dp = 24.4  mK/GPa. Despite the high purity of the crystals, the residual Sommerfeld coefficient is relatively large γ0 ≈ 40 mJ/K2mol, i.e., less than about half of the value in the normal state (100 mJ/K2mol). The field dependences of γ0(B) and its respective coefficient in thermal expansion α0(B) are analyzed within the frame of two gap scenario.

[1] J. Chen et al., Phys. Rev. Lett. 125, 237002 (2020)

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