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Search for a quantum critical end-point in CeRu2(Si1-xGex)2

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Weickert,  F.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Gegenwart,  P.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mydosh,  J. A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Weickert, F., Gegenwart, P., Mydosh, J. A., Steglich, F., Kanadani, C., Tabata, Y., et al. (2005). Search for a quantum critical end-point in CeRu2(Si1-xGex)2. Physica B-Condensed Matter, 359-361, 68-70. doi:10.1016/j.physb.2004.12.059.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-2CD7-D
Abstract
We use high-resolution dilatometry and electrical resistivity down to 20 mK and millitesla magnetic field steps to search for a possible quantum critical (end-) point (QC(E)P) in CeRu22(Si1-x1-xGexx)22 with x=0.00x=0.00 and 0.02 at the metamagnetic transition (MMT), Bm=7.8Bm=7.8 and 6.8 T, respectively. We do not find any evidence for QCEP since (i) the peak height and FWHM of the magnetostrictive anomaly saturate below 0.2 K and (ii) the thermal expansion and the electrical resistivity indicate the formation of a Landau–Fermi liquid (LFL) state below 0.3 K even at B=BmB=Bm. We speculate that the metamagnetic crossover represents a Fermi surface reconstruction that is fully completed below 0.2 K.