Metallic State in Cubic FeGe Beyond Its Quantum Phase Transition

P. PEDRAZZINI; H. WILHELM; D. JACCARD; T. JARLBORG; M. SCHMIDT; M. HANFLAND; L. AKSELRUD; H. Q. YUAN; U. SCHWARZ; YU. GRIN; F. STEGLICH

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Año: 2007 vol. 98 p. 47204 - 47204

0031-9007

We report on results of electrical resistivity and structural investigations on the cubic modification of FeGe under high pressure. The long-wavelength helical order (TC=280 K) is suppressed at a critical pressure pc=19 GPa. An anomaly at TX(p) and strong deviations from a Fermi-liquid behavior in a wide pressure range above pc suggest that the suppression of TC 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 TC(p) phase line.