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

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 anom...

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Veröffentlicht in:Physical review letters 2016-03, Vol.116 (12), p.127001-127001
Hauptverfasser: Chen, Jiasheng, Semeniuk, Konstantin, Feng, Zhuo, Reiss, Pascal, Brown, Philip, Zou, Yang, Logg, Peter W, Lampronti, Giulio I, Grosche, F Malte
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Sprache:eng
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Zusammenfassung: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.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.116.127001