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          Institute: MPI für Chemische Physik fester Stoffe     Collection: publications 2013     Display Documents



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ID: 671351.0, MPI für Chemische Physik fester Stoffe / publications 2013
Unconventional magnetism in multivalent charge-ordered YbPtGe2 probed by 195Pt and 171Yb-NMR
Authors:Sarkar, R.; Gumeniuk, R.; Leithe-Jasper, A.; Schnelle, W.; Grin, Y.; Geibel, C.; Baenitz, M.
Language:English
Date of Publication (YYYY-MM-DD):2013-11-01
Title of Journal:Physical Review B
Volume:88
Issue / Number:20
Start Page:201101-1
End Page:201101-5
Sequence Number of Article:201101
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Ina Werner
Affiliations:MPI für chemische Physik fester Stoffe
Identifiers:ISI:000326506200001 [ID No:1]
ISSN:1098-0121 [ID No:2]
DOI:10.1103/PhysRevB.88.201101
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