Thermal Expansion of CeCu2(Si1-xGex)2

Thermal Expansion of CeCu2(Si1-xGex)2

We report low-temperature thermal expansion measurements on CeCu2(Si1-xGex)2 single crystals with 0.01 x 0.45. The results evidence a new magnetic phase diagram more complex than previously obtained. In addition to the antiferromagnetic transition TN (x), a first order transition T1(x) within the ma...

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Veröffentlicht in:Low Temperature Physics: Part B (AIP Conference Proceedings Volume 850) 2006-01, Vol.850, p.1165-1166
Hauptverfasser: Oeschler, Niels, Deppe, Micha, Gegenwart, Philipp, Geibel, Christoph, Steglich, Frank
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creator Oeschler, Niels
Deppe, Micha
Gegenwart, Philipp
Geibel, Christoph
Steglich, Frank
description We report low-temperature thermal expansion measurements on CeCu2(Si1-xGex)2 single crystals with 0.01 x 0.45. The results evidence a new magnetic phase diagram more complex than previously obtained. In addition to the antiferromagnetic transition TN (x), a first order transition T1(x) within the magnetic state is observed in the whole doping range studied. For x = 0.25, a tetracritical point is found at which TN(x) and T1(x) merge together. Furthermore, the analysis of the Gruneisen parameter suggests that at this concentration a transition from rather localized f electrons for x > 0.25 to composite heavy fermions for x < 0.25 occurs. This strongly supports the itinerant spin-density-wave scenario for the quantum-critical point observed in CeCu2Si2.
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