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  Composition dependence of the magnetic properties of Ge-doped CeCu2Si2

Berisso, M. G., Pedrazzini, P., Deppe, M., Trovarelli, O., Geibel, C., & Sereni, J. G. (2002). Composition dependence of the magnetic properties of Ge-doped CeCu2Si2. Physica B, 320(1-4), 380-383. doi:10.1016/S0921-4526(02)00753-6.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-3137-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0017-D35C-9
Genre: Journal Article

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 Creators:
Berisso, M. G., Author
Pedrazzini, P., Author
Deppe, M.1, Author              
Trovarelli, O.1, Author              
Geibel, C.2, Author              
Sereni, J. G., Author
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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Free keywords: non-Fermi liquid; cerium systems
 Abstract: Due to the proximity of CeCu2Si2 to a quantum critical point, the ground state of this compound is extremely sensitive to sample preparation conditions. Small excess of one component can lead to magnetic or superconducting behaviors. We found that in the alloy CeCu2(Si1-xGex)(2) a small excess of Ge enhances the homogeneity range allowing a precise investigation of stoichiometric effects on the physical properties. In this system, Ge doping produces an increment of the antiferromagnetic transition temperature T-N, while the superconducting one decreases. Particularly, it was found that at x = 0.1 both phases coexist at low temperature. In order to investigate the stability of these phases against changes of the Ce-ligands composition, we prepared a series of CeCu2+y(Si0.9Ge0.1)2-x, samples (0less than or equal toyless than or equal to0.10) and investigated their specific heat and electrical resistivity. We observed that the substitution of Si/Ge by Cu increases the characteristic temperature and weakens the magnetic contribution without modifying TN. A further transition, of the first order character, is observed at lower temperature. (C) 2002 Elsevier Science B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2002-07
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 16311
ISI: 000177607700103
DOI: 10.1016/S0921-4526(02)00753-6
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Title: Physica B
  Alternative Title : Physica B
Source Genre: Journal
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Pages: - Volume / Issue: 320 (1-4) Sequence Number: - Start / End Page: 380 - 383 Identifier: ISSN: 0921-4526