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  Two-Channel Kondo Physics due to As Vacancies in the Layered Compound ZrAs1.58Se0.39

Cichorek, T., Bochenek, L., Schmidt, M., Czulucki, A., Auffermann, G., Kniep, R., et al. (2016). Two-Channel Kondo Physics due to As Vacancies in the Layered Compound ZrAs1.58Se0.39. Physical Review Letters, 117(10): 106601, pp. 1-6. doi:10.1103/PhysRevLett.117.106601.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-9AF6-B Version Permalink: http://hdl.handle.net/21.11116/0000-0000-FC7D-9
Genre: Journal Article

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 Creators:
Cichorek, T.1, Author
Bochenek, L.1, Author
Schmidt, M.2, Author              
Czulucki, A.3, Author              
Auffermann, G.4, Author              
Kniep, R.5, Author              
Niewa, R.1, Author
Steglich, F.6, Author              
Kirchner, S.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
3Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
4Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863432              
5Rüdiger Kniep, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863437              
6Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: We address the origin of the magnetic-field-independent -vertical bar A vertical bar T-1/2 term observed in the low-temperature resistivity of several As-based metallic systems of the PbFCl structure type. For the layered compound ZrAs1.58Se0.39, we show that vacancies in the square nets of As give rise to the low-temperature transport anomaly over a wide temperature regime of almost two decades in temperature. This low-temperature behavior is in line with the nonmagnetic version of the two-channelKondo effect, whose origin we ascribe to a dynamic Jahn-Teller effect operating at the vacancy-carrying As layer with a C-4 symmetry. The pair-breaking nature of the dynamical defects in the square nets of As explains the lowsuperconducting transition temperature T-c approximate to 0.14 K of ZrAs1.58Se0.39 compared to the free-of-vacancies homologue ZrP1.54S0.46 (T-c approximate to 3.7 K). Our findings should be relevant to a wide class of metals with disordered pnictogen layers.

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Language(s): eng - English
 Dates: 2016-09-022016-09-02
 Publication Status: Published in print
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 117 (10) Sequence Number: 106601 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1