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Towards strongly correlated semimetals: U2Ru2Sn and Eu8Ga16Ge30

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Paschen,  S.
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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Tran,  V. H.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Rabis,  A.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Carrillo-Cabrera,  W.
Chemical Metal Science, 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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Strydom,  A. M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Paschen, S., Baenitz, M., Tran, V. H., Rabis, A., Steglich, F., Carrillo-Cabrera, W., et al. (2002). Towards strongly correlated semimetals: U2Ru2Sn and Eu8Ga16Ge30. Journal of Physics and Chemistry of Solids, 63(6-8), 1183-1188. doi:10.1016/S0022-3697(02)00160-9.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-314B-F
Abstract
We present results of transport, magnetic, and calorimetric measurements on two f-electron based compounds: U2Ru2Sn and Eu8Ga16Ge30. We show that U2Ru2Sn shares several properties with the strongly correlated sernimetal CeNiSn. These analogies suggest that in U2Ru2Sn a narrow energy gap (or pseudogap) opens which is one order of magnitude larger than the one of CeNiSn. The two modifications of the clathrate Eu8Ga16Ge30 behave as local-moment ferromagnetic metals with relatively low Curie temperatures and small charge-carrier concentrations. The thermal conductivity is low and glass-like, as expected for 'filled-cage' systems. If, by modification of the Ga-Ge cages, a 'Kondo insulating' ground state could be realized, a high thermoelectric figure of merit associated with the (pseudo)gap opening would be expected. (C) 2002 Elsevier Science Ltd. All rights reserved.