Publications associated with Quantum Matter in High Magnetic Fields

Unconventional Superconductivity in the Layered Iron Germanide YFe(2)Ge(2).

Physical review letters 116 (2016) 127001-

J Chen, K Semeniuk, Z Feng, P Reiss, P Brown, Y Zou, PW Logg, GI Lampronti, FM Grosche

The iron-based intermetallic YFe_{2}Ge_{2} stands out among transition metal compounds for its high Sommerfeld coefficient of the order of 100  mJ/(mol K^{2}), which signals strong electronic correlations. A new generation of high quality samples of YFe_{2}Ge_{2} show superconducting transition anomalies below 1.8 K in thermodynamic, magnetic, and transport measurements, establishing that superconductivity is intrinsic in this layered iron compound outside the known superconducting iron pnictide or chalcogenide families. The Fermi surface geometry of YFe_{2}Ge_{2} resembles that of KFe_{2}As_{2} in the high pressure collapsed tetragonal phase, in which superconductivity at temperatures as high as 10 K has recently been reported, suggesting an underlying connection between the two systems.

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