Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-08-03
in "Properties and Applications of Thermoelectric Materials", edited by V. Zlatic and A. C. Hewson (Springer Science+Business
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 4 figures, Proceedings of the NATO Advanced Research Workshop on Properties and Application of Thermoelectric Materia
Scientific paper
10.1007/978-90-481-2892-1_15
Resistivity measurements have been made on Mn$_{1-x}$Fe$_x$Si single crystals between 2 and 300K for $x$ = 0, 0.05, 0.08, 0.12 and 0.15. Fe doping is found to depress the magnetic ordering temperature from 30K for $x$ = 0 to below 2K for $x$ = 0.15. Although Fe doping results in a large increase of the low-temperature residual resistivity, the temperature dependence of the resistivity above the magnetic transition remains practically unaffected by increasing Fe content. An analysis of the temperature derivative of the resistivity provides strong evidence for the existence of a non-Fermi-liquid ground state near $x$ = 0.15 and thus for a quantum critical point tuned by Fe content.
Adelmann Peter
Grube Kai
Hardy Frederic
Knafo William
Löhneysen Hilbert v.
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