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  Abnormal specific heat enhancement and non-Fermi-liquid behavior in the heavy-fermion system U2Cu17-xGax (5 <= x <= 8)

Svanidze, E., Amon, A., Prots, Y., Leithe-Jasper, A., & Grin, Y. (2018). Abnormal specific heat enhancement and non-Fermi-liquid behavior in the heavy-fermion system U2Cu17-xGax (5 <= x <= 8). Physical Review B, 97(11): 115148, pp. 1-9. doi:10.1103/PhysRevB.97.115148.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-23C9-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-23CD-1
Genre: Journal Article

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 Creators:
Svanidze, E.1, Author              
Amon, A.1, Author              
Prots, Yu.2, Author              
Leithe-Jasper, A.3, Author              
Grin, Yu.4, Author              
Affiliations:
1Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863405              
2Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863424              
3Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              
4Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              

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 Abstract: In the antiferromagnetic heavy-fermion compound U2Zn17, the Sommerfeld coefficient. can be enhanced if all Zn atoms are replaced by a combination of Cu and Al or Cu and Ga. In the former ternary phase, glassy behavior was observed, while for the latter, conflicting ground-state reports suggest material quality issues. In this work, we investigate the U2Cu17-xGax substitutional series for 4.5 <= x <= 9.5. In the homogeneity range of the phase with the Th2Zn17-type of crystal structure, all samples exhibit glassy behavior with 0.6 K <= T-f <= 1.8 K. The value of the electronic specific heat coefficient gamma in this system exceeds 900 mJ/mol(U) K-2. Such a drastic effective-mass enhancement can possibly be attributed to the effects of structural disorder, since the role of electron concentration and lattice compression is likely minimal. Crystallographic disorder is also responsible for the emergence of non-Fermi-liquid behavior in these spin-glass materials, as evidenced by logarithmic divergence of magnetic susceptibility, specific heat, and electrical resistivity.

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Language(s): eng - English
 Dates: 2018-03-262018-03-26
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 97 (11) Sequence Number: 115148 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008