Universität zu Köln

Yogi, Arvind Kumar, Yaresko, Alexander, Sathish, C. I., Sim, Hasung, Morikawa, Daisuke ORCID: 0000-0001-8110-7499, Nuss, Juergen ORCID: 0000-0002-0679-0184, Tsuda, Kenji ORCID: 0000-0001-9414-2891, Noda, Yukio, Khomskii, Daniel I. and Park, Je-Geun ORCID: 0000-0002-3930-4226 (2022). Coexisting Z-type charge and bond order in metallic NaRu2O4. Commun. Mater., 3 (1). LONDON: SPRINGERNATURE. ISSN 2662-4443

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Abstract

How particular bonds form in quantum materials has been a long-standing puzzle. Two key concepts dealing with charge degrees of freedom are dimerization (forming metal-metal bonds) and charge ordering. Since the 1930s, these two concepts have been frequently invoked to explain numerous exciting quantum materials, typically insulators. Here we report dimerization and charge ordering within the dimers coexisting in metallic NaRu2O4. By combining high-resolution x-ray diffraction studies and theoretical calculations, we demonstrate that this unique phenomenon occurs through a new type of bonding, which we call Z-type ordering. The low-temperature superstructure has strong dimerization in legs of zigzag ladders, with short dimers in legs connected by short zigzag bonds, forming Z-shape clusters: simultaneously, site-centered charge ordering also appears. Our results demonstrate the yet unknown flexibility of quantum materials with the intricate interplay among orbital, charge, and lattice degrees of freedom. Combined dimerization and charge ordering are rare to observe in the chemical bonding of a material. Here, a metal-metal phase transition is observed in NaRu2O4, in which site-centered charge ordering coexists with dimerization.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Yogi, Arvind Kumar UNSPECIFIED UNSPECIFIED UNSPECIFIED Yaresko, Alexander UNSPECIFIED UNSPECIFIED UNSPECIFIED Sathish, C. I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sim, Hasung UNSPECIFIED UNSPECIFIED UNSPECIFIED Morikawa, Daisuke UNSPECIFIED orcid.org/0000-0001-8110-7499 UNSPECIFIED Nuss, Juergen UNSPECIFIED orcid.org/0000-0002-0679-0184 UNSPECIFIED Tsuda, Kenji UNSPECIFIED orcid.org/0000-0001-9414-2891 UNSPECIFIED Noda, Yukio UNSPECIFIED UNSPECIFIED UNSPECIFIED Khomskii, Daniel I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Park, Je-Geun UNSPECIFIED orcid.org/0000-0002-3930-4226 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-687501
DOI:	10.1038/s43246-022-00224-8
Journal or Publication Title:	Commun. Mater.
Volume:	3
Number:	1
Date:	2022
Publisher:	SPRINGERNATURE
Place of Publication:	LONDON
ISSN:	2662-4443
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language HIGH-PRESSURE SYNTHESIS; CRYSTAL-STRUCTURE; PARAMETERS; TRANSITION; MAGNETISM; ELECTRONS; SPINEL Multiple languages Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68750