Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102257
Title: Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6
Authors: Zvereva, E. A.
Stratan, M. I.
Ushakov, A. V.
Nalbandyan, V. B.
Shukaev, I. L.
Silhanek, A. V.
Abdel-Hafiez, M.
Streltsov, S. V.
Vasiliev, A. N.
Issue Date: 2016
Publisher: Royal Society of Chemistry
Citation: Orbitally induced hierarchy of exchange interactions in the zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6 / E. A. Zvereva, M. I. Stratan, A. V. Ushakov, et al. — DOI 10.1039/c6dt00516k // Dalton Transactions. — 2016. — Vol. 45. — Iss. 17. — P. 7373-7384.
Abstract: We report the revised crystal structure, static and dynamic magnetic properties of quasi-two dimensional honeycomb-lattice silver delafossite Ag3Co2SbO6. The magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic long range order at low temperatures with Néel temperature TN ∼ 21.2 K. In addition, the magnetization curves revealed a field-induced (spin-flop type) transition below TN in moderate magnetic fields. The GGA+U calculations show the importance of the orbital degrees of freedom, which maintain a hierarchy of exchange interaction in the system. The strongest antiferromagnetic exchange coupling was found in the shortest Co-Co pairs and is due to direct and superexchange interaction between the half-filled xz + yz orbitals pointing directly to each other. The other four out of six nearest neighbor exchanges within the cobalt hexagon are suppressed, since for these bonds the active half-filled orbitals turned out to be parallel and do not overlap. The electron spin resonance (ESR) spectra reveal a broad absorption line attributed to the Co2+ ion in an octahedral coordination with an average effective g-factor g = 2.40 ± 0.05 at room temperature and show strong divergence of the ESR parameters below ∼150 K, which implies an extended region of short-range correlations. Based on the results of magnetic and thermodynamic studies in applied fields, we propose a magnetic phase diagram for the new honeycomb-lattice delafossite. © The Royal Society of Chemistry 2016.
Keywords: ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
CARBON DIOXIDE
COBALT
CRYSTAL STRUCTURE
DEGREES OF FREEDOM (MECHANICS)
ELECTROSPINNING
EXCHANGE INTERACTIONS
HONEYCOMB STRUCTURES
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MAGNETISM
SILVER
SPECIFIC HEAT
TEMPERATURE
ANTIFERROMAGNETIC EXCHANGE COUPLING
ANTIFERROMAGNETIC LONG-RANGE ORDERS
ANTIFERROMAGNETIC STATE
MAGNETIC PHASE DIAGRAMS
OCTAHEDRAL COORDINATION
ORBITAL DEGREES OF FREEDOM
SHORT-RANGE CORRELATIONS
SUPEREXCHANGE INTERACTION
ELECTRON SPIN RESONANCE SPECTROSCOPY
URI: http://hdl.handle.net/10995/102257
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 84969556013
PURE ID: 864790
ISSN: 14779226
DOI: 10.1039/c6dt00516k
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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