Pedrazzini, P., H. Wilhelm, D. Jaccard, T. Jarlborg, M. Schmidt, M. Hanfland, L. Akselrud, H. Q. Yuan, U. Schwarz, Yu. Grin et al. "Metallic State in Cubic FeGe Beyond Its Quantum Phase Transition." Physical Review Letters 98 (2007): 047204.
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 (TC=280K) is suppressed at a critical pressure pc≈19GPa. 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.