title: Metallic state in cubic FeGe beyond its quantum phase transition.
abstract: We report on results of electrical resistivity and structural investigations on the cubic modification of FeGe under high pressure. The long-wavelength helical order (T(C) = 280 K) is suppressed at a critical pressure p(c) approximately 19 GPa. An anomaly at T(X)(p) and strong deviations from a Fermi-liquid behavior in a wide pressure range above p(c) suggest that the suppression of T(C) disagrees with the standard notion of a quantum critical phase transition. The metallic ground state persisting at high pressure can be described by band-structure calculations if zero-point motion is included. The shortest FeGe interatomic distance display discontinuous changes in the pressure dependence close to the T(C)(p) phase line.
authors.affiliation: DPMC, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genève 4, Switzerland.
authors.forename: P
authors.initials: P
authors.lastname: Pedrazzini
authors.forename: H
authors.initials: H
authors.lastname: Wilhelm
authors.forename: D
authors.initials: D
authors.lastname: Jaccard
authors.forename: T
authors.initials: T
authors.lastname: Jarlborg
authors.forename: M
authors.initials: M
authors.lastname: Schmidt
authors.forename: M
authors.initials: M
authors.lastname: Hanfland
authors.forename: L
authors.initials: L
authors.lastname: Akselrud
authors.forename: H Q
authors.initials: HQ
authors.lastname: Yuan
authors.forename: U
authors.initials: U
authors.lastname: Schwarz
authors.forename: Yu
authors.initials: Y
authors.lastname: Grin
authors.forename: F
authors.initials: F
authors.lastname: Steglich