Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-06-29
Phys. Rev. Lett. 96, 047008 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, including 4 figures. New results added. Significant changes on the text and Fig. 4
Scientific paper
10.1103/PhysRevLett.96.047008
In the archetypal strongly correlated electron superconductor CeCu$_2$Si$_2$ and its Ge-substituted alloys CeCu$_2$(Si$_{1-x}$Ge$_{x}$)$_2$ two quantum phase transitions -- one magnetic and one of so far unknown origin -- can be crossed as a function of pressure \cite{Yuan 2003a}. 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 $p_{c1}$, $1\leq\alpha\leq 1.5$) $\alpha$ 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 $p_{c2}$, $\alpha\simeq 1$), suggesting critical scattering from local or Q=0 modes, in agreement with a density/valence fluctuation approach.
Deppe Micha
Geibel Ch.
Grosche Malte F.
Sparn G.
Steglich Frank
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