[en] 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 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 Co2+ ion in octahedral coordination with average effective g-factor g=2.40±0.05 at room temperature and show strong divergence of 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 the magnetic phase diagram for the new honeycomb-lattice delafossite.
Disciplines :
Physics
Author, co-author :
Zvereva, E.A.; Faculty of Physics, Moscow State University, 119991 Moscow, Russia
Stratan, M.I.; Faculty of Physics, Moscow State University, 119991 Moscow, Russia
Ushakov, A.V.; Institute of Metal Physics, S. Kovalevskoy St. 18, 620990 Ekaterinburg, Russia
Nalbandyan, V.B.; Chemistry Faculty, Southern Federal University, 344090 Rostov-on-Don, Russia
Shukaev, I.L.; Chemistry Faculty, Southern Federal University, 344090 Rostov-on-Don, Russia
Silhanek, Alejandro ; Université de Liège > Département de physique > Physique expérimentale des matériaux nanostructurés
Abdel-Hafiez, M.; Institute of Physics, Goethe University Frankfurt, 60438 Frankfurt/M, Germany
Streltsov, S.V.; Institute of Metal Physics, S. Kovalevskoy St. 18, 620990 Ekaterinburg, Russia
Vasiliev, A.N.; Faculty of Physics, Moscow State University, 119991 Moscow, Russia
Language :
English
Title :
Orbitally induced hierarchy of exchange interactions in zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6
Publication date :
2016
Journal title :
Journal of the Chemical Society. Dalton Transactions
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