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24 April 2024 |
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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
; | | Date: |
19 Jun 2006 | | Subject: | Strongly Correlated Electrons | | 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 $p_capprox 19$~GPa. An anomaly in the resistivity data 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 structural disorder due to zero-point motion is included. Discontinuous changes in the pressure dependence of the shortest Fe-Ge interatomic distance occurring close to the $T_C(p)$ phase line could be interpreted as a symmetry-conserving transition of first order. | | Source: | arXiv, cond-mat/0606493 | | Services: | Forum | Review | PDF | Favorites | |
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