Divergence of the quadrupole-strain susceptibility of the electronic nematic system YbRu 2 Ge 2 .

Autor:	Rosenberg EW; Department of Applied Physics, Stanford University, Stanford, CA 94305; erosenbe@stanford.edu irfisher@stanford.edu., Chu JH; Department of Physics, University of Washington, Seattle, WA 98195., Ruff JPC; Cornell High Energy Synchrotron Source, Cornell University, Ithaca, NY 14853., Hristov AT; Department of Physics, Stanford University, Stanford, CA 94305., Fisher IR; Department of Applied Physics, Stanford University, Stanford, CA 94305; erosenbe@stanford.edu irfisher@stanford.edu.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2019 Apr 09; Vol. 116 (15), pp. 7232-7237. Date of Electronic Publication: 2019 Mar 21.
DOI:	10.1073/pnas.1818910116
Abstrakt:	Ferroquadrupole order associated with local [Formula: see text] atomic orbitals of rare-earth ions is a realization of electronic nematic order. However, there are relatively few examples of intermetallic materials which exhibit continuous ferroquadrupole phase transitions, motivating the search for additional materials that fall into this category. Furthermore, it is not clear a priori whether experimental approaches based on transport measurements which have been successfully used to probe the nematic susceptibility in materials such as the Fe-based superconductors will be as effective in the case of [Formula: see text] intermetallic materials, for which the important electronic degrees of freedom are local rather than itinerant and are consequently less strongly coupled to the charge-carrying quasiparticles near the Fermi energy. In the present work, we demonstrate that the intermetallic compound [Formula: see text] exhibits a tetragonal-to-orthorhombic phase transition consistent with ferroquadrupole order of the Yb ions and go on to show that elastoresistivity measurements can indeed provide a clear window on the diverging nematic susceptibility in this system. This material provides an arena in which to study the causes and consequences of electronic nematicity. Competing Interests: The authors declare no conflict of interest. (Copyright © 2019 the Author(s). Published by PNAS.)
Databáze:	MEDLINE
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