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  Contiguous 3d and 4f Magnetism: Strongly Correlated 3d Electrons in YbFe2Al10

Khuntia, P., Peratheepan, P., Strydom, A. M., Utsumi, Y., Ko, K.-.-T., Tsuei, K.-.-D., et al. (2014). Contiguous 3d and 4f Magnetism: Strongly Correlated 3d Electrons in YbFe2Al10. Physical Review Letters, 113(21): 216403, pp. 1-5. doi:10.1103/PhysRevLett.113.216403.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-9C53-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-F40F-C
Genre: Journal Article

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 Creators:
Khuntia, P.1, Author              
Peratheepan, P.2, Author
Strydom, A. M.1, Author              
Utsumi, Y.3, Author              
Ko, K. -T.2, Author
Tsuei, K. -D.2, Author
Tjeng, L. H.4, Author              
Steglich, F.5, Author              
Baenitz, M.6, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
4Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              
5Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              
6Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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 Abstract: We present magnetization, specific heat, and Al-27 NMR investigations on YbFe2Al10 over a wide range in temperature and magnetic field. The magnetic susceptibility at low temperatures is strongly enhanced at weak magnetic fields, accompanied by a ln (T-0/T) divergence of the low-T specific heat coefficient in zero field, which indicates a ground state of correlated electrons. From our hard-x-ray photoemission spectroscopy study, the Yb valence at 50 K is evaluated to be 2.38. The system displays valence fluctuating behavior in the low to intermediate temperature range, whereas above 400 K, Yb3+ carries a full and stable moment, and Fe carries a moment of about 3.1(mu B). The enhanced value of the Sommerfeld-Wilson ratio and the dynamic scaling of the spin-lattice relaxation rate divided by T[(27)(1/T1T)] with static susceptibility suggests admixed ferromagnetic correlations. (27)(1/T1T) simultaneously tracks the valence fluctuations from the 4f Yb ions in the high temperature range and field dependent antiferromagnetic correlations among partially Kondo screened Fe 3d moments at low temperature; the latter evolve out of an Yb 4f admixed conduction band.

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Language(s): eng - English
 Dates: 2014-11-192014-11-21
 Publication Status: Published in print
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 113 (21) Sequence Number: 216403 Start / End Page: 1 - 5 Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1