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Non-Fermi liquid states in the pressurized CeCu2(Si1-xGex)2 system: two critical points | H Q Yuan
; F M Grosche
; M Deppe
; G Sparn
; C Geibel
; F Steglich
; | Date: |
3 Feb 2006 | Journal: | Phys Rev Lett, 96 (4), 047008 | Abstract: | In the archetypal strongly correlated electron superconductor CeCu2Si2 and its Ge-substituted alloys CeCu2(Si1-xGex)2 two quantum phase transitions--one magnetic and one of so far unknown origin-can be crossed as a function of pressure. We examine the associated anomalous normal state by detailed measurements of the low temperature resistivity (rho) power-law exponent alpha. At the lower critical point (at pcl, 1<or=alpha<or=1.5) alpha depends strongly on Ge concentration x and thereby on disorder level, consistent with a Hlubina-Rice-Rosch scenario of critical scattering off antiferromagnetic fluctuations. By contrast, alpha is independent of x at the upper quantum phase transition (at pc2, alpha approximately equal to 1), suggesting critical scattering from local or q=0 modes, in agreement with a density- or valence-fluctuation approach. | Source: | PubMed, pmid16486879 | Services: | Forum | Review | Favorites |
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