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TT: Fachverband Tiefe Temperaturen

TT 29: Unconventional Superconductors

TT 29.11: Vortrag

Dienstag, 10. März 2026, 12:15–12:30, CHE/0091

Effects of disorder on the superconducting properties of YFe₂Ge₂ — •Mads Hansen¹, Han Zong¹, Jiasheng Chen¹, Romian Grasset², Siham Benhabib³, and Malte Grosche¹ — ¹University of Cambridge, Cambridge, United Kingdom — ²Laboratoire des Solides Irradies, École Polytechnique, CNRS, Institut Polytechnique de Paris, Palaiseau, France — ³Laboratoire de Physique des Solides, Orsay, France

YFe₂Ge₂ has been reported as an unconventional superconductor [1-3]. The non-Fermi liquid behavior observed in the normal state, as well as enhanced magnetic fluctuations [4,5] evidence the strongly correlated nature of the electron system. The pairing mechanism remains unknown, however, theoretical proposals hypothesize two different scenarios: an s^+/− [6] or a triplet pairing wavefunction [7]. We have grown high quality crystals and induced point-like defects at various concentrations, using the electron irradiation facility SIRIUS. Here, we present a study on the effect of disorder on the Sommerfeld coefficient and the transport properties of YFe₂Ge₂ to address the outstanding question of the pairing mechanism.
[1] Y. Zou et al., Phys. Status Solidi RRL 8, 928 (2014)
[2] J. Chen et al., Phys. Rev. Lett. 116, 127001 (2016)
[3] J. Chen et al., Phys. Rev. Lett. 125, 237002 (2020)
[4] N. Sirica et al., Phys. Rev. B 91, 121102 (2015)
[5] H. Wo et al., Phys. Rev. Lett. 122, 217003 (2019)
[6] A. Subedi, Phys. Rev. 89, 024504 (2014)
[7] D. J. Singh, Phys. Rev. B 89, 024505 (2014)

Keywords: Fe-based; Pairing mechanism