Publication Date:
2018-08-08
Description:
Author(s): Arvind Yogi, C. I. Sathish, Hasung Sim, Matthew J. Coak, Y. Noda, and Je-Geun Park Synthesis of complex materials can lead to discoveries of novel emergent phenomena as well as innovative applications. Combined electrical resistivity, specific heat, susceptibility, and single-crystal x-ray diffraction studies reveal that Na 2 . 7 Ru 4 O 9 undergoes a unique unconventional charge-ordering transition at room temperature while retaining metallicity. This electronic transition drives an intricate trigonal distortion in the RuO 6 octahedron, which possibly enhances the localized 4 d Ru electrons. Furthermore, from the intermediate phase to the low-temperature phase, the structure shows large Na ion displacements along the crystallographic b direction by about 1/4 from its normal site. The authors suggest that these effects are at the origin of the first-order phase transition and provide an unprecedented ionic displacement driven charge ordering in Na 2 . 7 Ru 4 O 9 . [Phys. Rev. B 98, 085113] Published Tue Aug 07, 2018
Keywords:
Electronic structure and strongly correlated systems
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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