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Competing interactions and magnetic frustration in Yb4LiGe4

Disseler, S. M., Svensson, J. N, Peter, S. C., Byers, C. P., Baines, C., Amato, A., Giblin, Sean, Carretta, P. and Graf, M. J. 2011. Competing interactions and magnetic frustration in Yb4LiGe4. Physical Review B Condensed Matter and Materials Physics 84 (17) , 174429.

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Abstract

We have studied polycrystalline Yb4LiGe4, a ternary variant of the R5T4 family of layered compounds characterized by a very strong coupling between the magnetic and crystallographic degrees of freedom. The system is mixed valent, with nonmagnetic Yb2+ and magnetic Yb3+ present, and is characterized by coexisting ferromagnetic (FM) and antiferromagnetic (AFM) correlations. We present measurements of resistivity, AC-susceptibility, specific heat, and muon spin relaxation (μSR), below 1 K. The low temperature measurements suggest a transition to a mesoscopically inhomogeneous magnetically ordered state below 2 K characterized by fluctuations well below the ordering temperature. This unusual state is believed to result from the enhanced two-dimensionality produced by Li substitution and frustration effects inherent in the Yb-sublattice geometry.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: American Physical Society
ISSN: 1098-0121
Last Modified: 04 Jun 2017 04:37
URI: http://orca.cf.ac.uk/id/eprint/41518

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