Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 54: Fe-based Superconductors

TT 54.7: Vortrag

Donnerstag, 19. März 2020, 11:00–11:15, HSZ 201

Unconventional superconductivity and electronic structure of ultra-pure single crystal YFe2Ge2 — •Jiasheng Chen1, Jordan Baglo1,2, Keiron Murphy1, Devashibhai Adroja3, Pabitra Biswas3, Jacintha Banda4, Manuel Brando4, and Malte Grosche11Cavendish Laboratory, Cambridge, UK — 2Université de Sherbrooke, Canada — 3ISIS Neutron and Muon Source Science, RAL, UK — 4MPI CPfS, Dresden, Germany

The layered iron-based superconductor YFe2Ge2 exhibits an unusually high Sommerfeld coefficient of ∼ 100 mJ/molK2 and a T3/2 temperature dependence of electrical resistivity at low temperature [1-3], indicating strong electronic correlations. While superconductivity in YFe2Ge2 is widely observed below Tc ∼ 1.9 K in electric transport measurements, it is strongly suppressed by lattice disorder [1-3], hinting at an unconventional pairing mechanism.

Our new generation of single crystals reach residual resistivity ratios (RRR) in excess of 650. These crystals display a sharp superconducting heat capacity anomaly just below 1.2 K. For the first time, they enable detailed thermodynamic and spectroscopic studies of the normal and superconducting states of YFe2Ge2. These include low temperature heat capacity measurements, the resolution of key aspects of the electronic structure of YFe2Ge2 by quantum oscillation techniques and the determination of the penetration depth by muon spin rotation measurements.

[1] Y. Zou et al., PSS-RRL 8, 928 (2014)

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

[3] J. Chen et al., PRB, 99, 020501(R) (2019)

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