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Competing interactions and magnetic frustration in Yb4LiGe4

By S. M. Disseler, J. N Svensson, S. C. Peter, C. P. Byers, C. Baines, A. Amato, Sean Giblin, P. Carretta and M. J. Graf

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

Topics: QC
Publisher: American Physical Society
Year: 2011
OAI identifier: oai:http://orca.cf.ac.uk:41518
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