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  Unconventional magnetism in multivalent charge-ordered YbPtGe2 probed by 195Pt and 171Yb-NMR

Sarkar, R., Gumeniuk, R., Leithe-Jasper, A., Schnelle, W., Grin, Y., Geibel, C., et al. (2013). Unconventional magnetism in multivalent charge-ordered YbPtGe2 probed by 195Pt and 171Yb-NMR. Physical Review B, 88(20): 201101, pp. 201101-1-201101-5. doi:10.1103/PhysRevB.88.201101.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1E2A-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1E2B-F
Genre: Journal Article

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 Creators:
Sarkar, R.1, Author              
Gumeniuk, R.2, Author              
Leithe-Jasper, A.3, Author              
Schnelle, W.4, Author              
Grin, Y.5, Author              
Geibel, C.6, Author              
Baenitz, M.7, Author              
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Roman Gumeniuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863421              
3Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              
4Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
5Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863413              
6Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
7Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863471              

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 Abstract: Detailed Pt-195 and Yb-171 nuclear magnetic resonance (NMR) studies on the heterogeneous mixed valence system YbPtGe2 are reported. The temperature dependence of the Pt-195-NMR shift K-195(T) indicates the opening of an unusual magnetic gap below 200 K. K-195(T) was analyzed by a thermal activation model which yields an isotropic gap Delta/k(B) approximate to 200 K. In contrast, the spin-lattice relaxation rate (195)(1/T-1) does not provide evidence for the gap. Therefore, an intermediate-valence picture is proposed while a Kondo-insulator scenario can be excluded. Moreover, (195)(1/T-1) follows a simple metallic behavior, similar to the reference compound YPtGe2. A well-resolved NMR line with small shift is assigned to divalent Yb-171. This finding supports the proposed model with two subsets of Yb species (di- and trivalent) located on the Yb2 and Yb1 site of the YbPtGe2 lattice.

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Language(s): eng - English
 Dates: 2013-11-01
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: eDoc: 671351
ISI: 000326506200001
DOI: 10.1103/PhysRevB.88.201101
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Title: Physical Review B
Source Genre: Journal
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Pages: - Volume / Issue: 88 (20) Sequence Number: 201101 Start / End Page: 201101-1 - 201101-5 Identifier: ISSN: 1098-0121