Metallic State in Cubic FeGe Beyond Its Quantum Phase Transition

2006/06/19 by P. Pedrazzini, H. Wilhelm, D. Jaccard +13 · 2 citations
Physics and Astronomy · #Condensed matter physics #Magnetic properties of thin films #Materials science #Phase (matter) #Phase transition #Physics #Quantum #Quantum critical point #Quantum mechanics #Quantum phase transition #Rare-earth and actinide compounds #Semiconductor materials and interfaces #State (computer science) #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.98.047204

published as Phys. Rev. Lett. 98, 047204 (2007) · 4 pages, 4 figures

arxiv created 2006/06/19 · openalex publication_date 2007/01/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

Citations

• First-Order Transition from a Kondo Insulator to a Ferromagnetic Metal in Single CrystallineFeSi1−xGex
• Probing the extended non-Fermi liquid regimes of MnSi and Fe
• First-Order Transition between a Small Gap Semiconductor and a Ferromagnetic Metal in the Isoelectronic AlloyFeSi1−xGex

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