SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: Fe-based Superconductors

TT 34.6: Talk

Wednesday, March 29, 2023, 12:45–13:00, HSZ 103

Spin-density-wave order and evidence for superconductivity in single-crystal LuFe₂Ge₂ — •Jiasheng Chen and F. Malte Grosche — Cavendish Laboratory, Cambridge, UK

The discovery of unconventional superconductivity in YFe₂Ge₂ [1, 2] has encouraged the search for more iron-based superconductors in the germanide family. The isostructural and isoelectronic compound, LuFe₂Ge₂, exhibits physical properties that closely resemble those of YFe₂Ge₂. Despite the additional spin-density-wave order observed below 9 K in LuFe₂Ge₂, the overall shape and magnitude of the resistivity and susceptibility above 10 K, and the similarly enhanced Sommerfeld coefficient C/T > 70 mJ/molK² suggest a similar underlying physics in the two systems [3]. Using the liquid transport flux growth method [2], we investigated the effect of changing growth conditions on the crystal quality and on the spin-density-wave order in LuFe₂Ge₂. In the best samples with RRR reaching 170, we observe evidence of superconductivity, making it the second iron-germanide superconductor discovered to date.

[1] J. Chen et al., PRL 116, 127001 (2016)

[2] J. Chen et al., PRL 125, 237002 (2020)

[3] M. Avila et al., J. Magn. Magn. Mater. 270 , 51 (2004)