title: Unconventional Superconductivity in the Layered Iron Germanide YFe(2)Ge(2).
abstract: 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.
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
authors.forename: Jiasheng
authors.initials: J
authors.lastname: Chen
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
authors.forename: Konstantin
authors.initials: K
authors.lastname: Semeniuk
authors.affiliation: London Centre of Nanotechnology, University College London, London WC1H 0AH, United Kingdom.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Feng
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
authors.forename: Pascal
authors.initials: P
authors.lastname: Reiss
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
authors.forename: Philip
authors.initials: P
authors.lastname: Brown
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zou
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
authors.forename: Peter W
authors.initials: PW
authors.lastname: Logg
authors.affiliation: Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom.
authors.forename: Giulio I
authors.initials: GI
authors.lastname: Lampronti
authors.affiliation: Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom.
authors.forename: F Malte
authors.initials: FM
authors.lastname: Grosche