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Magnetic properties of S = 1 spin chain in Sr2Ni(SeO3)2Cl2: XY-antiferromagnet at Sakai-Takahashi phase diagramтезисы доклада
- Авторы: KOZLYAKOVA E., MOSKIN A., BERDONOSOV P., GAPONTSEV V., STRELTSOV S., SKOURSKI Y., SPACHMANN S., ELGHANDOUR A., KLINGELER R., VASILIEV A.N.
- Сборник: IV International Baltic Conference on Magnetism 2021 (IBCM-2021) Book of Abstracts
- Тезисы
- Год издания: 2021
- Место издания: Immanuel Kant Baltic Federal University, Kaliningrad, Russia Светлогорск, Калининградская область, Россия
- Первая страница: 145
- Последняя страница: 145
- Аннотация: An experimental realization of the Haldane conjecture of a gapped spin liquid is of greatinterested among condensed matter scientists. The conjecture is implemented in the chains ofHeisenberg integer spins bounded by identical intrachain exchange interactions J and could berealized in uniform quasi-one-dimensional integer spin compounds [1]. The Haldane phase has tocompete with magnetic anisotropy and long-range ordered phases, depending on the ratio ofinterchain J' and intrachain J exchange interactions and uniaxial D and rhombic E single-ionanisotropy. The critical ratios J'/J and D/J for Haldane phase, easy axis long ordered AFM andeasy plane long ordered XY-AFM were first discovered by Sakai and Takahashi [2]. Manycompounds, both organic and inorganic, have been studied to verify this idea, some of them havebeen identified as belonging to the Haldane sector of the Sakai-Takahashi phase diagram.In this work, the position on Sakai-Takahashi phase diagram was determined for the novelinteger spin S = 1 chain compound, strontium nickel selenite chloride Sr2Ni(SeO3)2Cl2. Thepowder sample was obtained by gas transport method. XRD measurements showed that the crystalstructure of the compound contains the NiO4Cl2-octahedra bridged by the SeO3-pyramids intouniform spin chains. These chains are well separated by strontium cations and cavities ofselenium’s lone pair of electrons that could lead to 1D-dimensionality of magnetic subsystem.Physical properties were investigated in magnetization, heat capacity and thermal expansionmeasurements. Pulsed-magnetic-field magnetization measurements up to 45 T were provided byDresden High Magnet Field Lab HLD EMFL. For magnetic structure calculations within the DFTit has been used the GGA+U approach with PBE potential within the VASP code.Thus it was determined that strontium nickel selenite chloride, Sr2Ni(SeO3)2Cl2, is a spin-1chain system which passes through a correlations regime at Tmax ~ 12 K to long-range order at TN= 6 K. The values of J'/J = 0.083 and D/J = 0.357 place this compound into a hitherto unoccupiedXY-AFM sector of the Sakai-Takahashi phase diagram.The authors acknowledge support by the Ministry of Education and Science of the RussianFederation within the framework of the governmental program of Megagrants P-220 and NUST“MISiS” Grant No. K2-2020-039. We also acknowledge the support of the HLD-HZDR memberof the European Magnetic Field Laboratory (EMFL).[1] F.D.M. Haldane, PRL 50, 1153-1156 (1983).[2] T. Sakai & M. Takahashi, PRB 42, 4537-4543 (1990).
- Добавил в систему: Моськин Артем Вячеславович
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | IBCM-2021-Book-of-Abstracts-4.pdf | 37,7 МБ | 24 октября 2021 [ArtemMoskin] |