(American Physical Society, 2007-01-00) Pedrazzini, P.; Wilhelm, H.; Jaccard, D.; Jarlborg, T.; Schmidt, M.; Hanfland, M.; Akselrud, L.; Yuan, H. Q.; Schwarz, U.; Grin, Yu.; Steglich, F.; Gerencia Física. Departamento Materia Condensada. División Bajas Temperaturas
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.
