Charge-ordering and spin-dimerization transition in CuIr2 S4

Lattice dynamics confirms octamer correlations

verfasst von

V. Gnezdilov, A. Glamazda, V. Tsurkan, P. Lemmens

Abstract

In the spinel CuIr2S4 an exotic, orbitally driven metal-insulator (MI) transition is observed at TMI∼230K. However, spectroscopic investigations presently do not agree with respect to the role of related lattice distortions and dynamic effects. Here, we present a detailed study of single-crystalline CuIr2S4 from different batches comparing detailed high- and low-temperature phonon spectra. An analysis using dynamic lattice calculations confirms a low-temperature collectively distorted structure according to previous synchrotron x-ray studies. The related isomorphic Ir3+ and Ir4+ octamers' formation and spin dimerization agree well with the proposed P1¯ symmetry. Thereby, previous discrepancies are resolved.

Externe Organisation(en)

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Technische Universität Braunschweig
Kharkov National University
Universität Augsburg
Moldova State University

Typ

Artikel

Journal

Physical Review Materials

Band

8

Publikationsdatum

20.09.2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Werkstoffwissenschaften (insg.), Physik und Astronomie (sonstige)

Elektronische Version(en)

https://doi.org/10.1103/physrevmaterials.8.095002 (Zugang: Geschlossen)