Electronic phase separation in the hexagonal perovskite ${\mathrm{Ba}}_{3}{\mathrm{SrMo}}_{2}{\mathrm{O}}_{9}$

Electronic phase separation in the hexagonal perovskite ${Ba}_{3} {SrMo}_{2} O_{9}$

S. Simpson, S. Fop, H. A. Hopper, G. B. G. Stenning, C. Ritter, and A. C. Mclaughlin

Phys. Rev. Materials 6, 024401 – Published 3 February 2022

Abstract

Competition between exotic magnetic and electronic ground states underpins the properties of strongly correlated transition metal oxides and can result in electronic phase separation (EPS). The 6H-perovskite ${Ba}_{3} {SrMo}_{2} O_{9}$ exhibits no magnetic order down to 1.6 K and EPS is observed at 230 K. The ground state of this material contains a complex mixture of spin-singlet ${Mo}_{2} O_{9}$ dimers and quasimolecular ${Mo}_{2} O_{9}$ clusters. Segregation in ${Ba}_{3} {SrMo}_{2} O_{9}$ emerges due to competition between direct Mo–Mo bonding and Mo–O–Mo magnetic superexchange, comprising an unusual mechanism of EPS in transition-metal oxides.

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Received 25 June 2021
Revised 2 December 2021
Accepted 7 January 2022

DOI:https://doi.org/10.1103/PhysRevMaterials.6.024401

Physics Subject Headings (PhySH)

Crystal structure Exchange interaction Exotic phases of matter Phase separation Quantum phase transitions Second order phase transitions

Crystal structures Crystallography Magnetization measurements Neutron diffraction

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Simpson¹, S. Fop¹, H. A. Hopper¹, G. B. G. Stenning², C. Ritter³, and A. C. Mclaughlin^1,*

¹Chemistry Department, University of Aberdeen, Meston Walk, Aberdeen, AB24 3UE, United Kingdom
²ISIS Experimental Operations Division, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, OX11 0QX, United Kingdom
³Institut Laue Langevin, 71 Avenue des Martyrs, BP 156, F-38042 Grenoble Cedex 9, France

^*a.c.mclaughlin@abdn.ac.uk

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Vol. 6, Iss. 2 — February 2022

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Physical Review Materials

Electronic phase separation in the hexagonal perovskite Ba3SrMo2O9

S. Simpson, S. Fop, H. A. Hopper, G. B. G. Stenning, C. Ritter, and A. C. Mclaughlin

Phys. Rev. Materials 6, 024401 – Published 3 February 2022

Abstract

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Electronic phase separation in the hexagonal perovskite ${Ba}_{3} {SrMo}_{2} O_{9}$