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

MPS-Authors
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Sarkar,  R.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Gumeniuk,  R.
Roman Gumeniuk, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Leithe-Jasper,  A.
Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle,  W.
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin,  Y.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel,  C.
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baenitz,  M.
Michael Baenitz, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

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.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-1E2A-2
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.