Spin State Crossover in Co3BO5 | Sciact - CRIS-system of Boreskov Institute of Catalysis

Spin State Crossover in Co3BO5 Full article

Journal

Physical Review B (started in 2016)
ISSN: 2469-9950 , E-ISSN: 2469-9969

Output data

Year: 2021, Volume: 103, Number: 9, Article number : 094445, Pages count : 19 DOI: 10.1103/physrevb.103.094445

Tags

CRYSTAL-STRUCTURE; MAGNETIC-PROPERTIES; SINGLE-CRYSTAL; LUDWIGITE; COBALT; IRON; CONDUCTIVITY; MOSSBAUER; MANGANESE; Co3O2BO3

Authors

Kazak N.V. ¹ , Platunov M.S. ¹ , Knyazev Yu.V. ¹ , Molokeev M.S. ¹ , Gorev M.V. ¹ , Ovchinnikov S.G. ¹ , Pchelkina Z.V. ^2,3 , Gapontsev V.V. ³ , Streltsov S.V. ^2,3 , Bartolomé J. ⁴ , Arauzo A. ^4,5 , Yumashev V.V. ⁶ , Gavrilkin S.Yu. ⁷ , Wilhelm F. ⁸ , Rogalev A. ⁸

Affiliations

1	Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
2	M.N. Miheev Institute of Metal Physics UB RAS, 620137 Ekaterinburg, Russia
3	Ural Federal University, 620002 Ekaterinburg, Russia
4	Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza and Departamento de Física de la Materia Condensada, 50009 Zaragoza, Spain
5	Servicio de Medidas Físicas, Universidad de Zaragoza, 50009 Zaragoza, Spain
6	Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
7	P.N. Lebedev Physical Institute of RAS, 119991 Moscow, Russia
8	ESRF-The European Synchrotron, 71 Avenue des Martyrs CS40220, F-38043 Grenoble Cedex 9, France

We have investigated the spin and oxidation states of Co in Co3BO5 using x-ray magnetic circular dichroism (XMCD) and dc magnetic susceptibility measurements. At low temperatures, XMCD experiments have been performed at the Co K-edge in Co3BO5 and Co2FeBO5 single crystals in the fully ferrimagnetically ordered phase. The Co (K-edge) XMCD signal is found to be related to the Co2+ magnetic sublattices in both compounds, providing strong experimental support for the low-spin (LS) Co3+ scenario. The paramagnetic susceptibility is highly anisotropic. An estimation of the effective magnetic moment in the temperature range 100–250 K correlates well with two Co2+ ions in the high-spin (HS) state and some orbital contribution, while Co3+ remains in the LS state. The crystal structure of the Co3BO5 single crystal has been solved in detail at the T range 296–703 K. The unit cell parameters and volume show anomalies at 500 and 700 K. The octahedral environment of the Co4 site strongly changes with heating. The generalized gradient approximation with Hubbard U correction calculations have revealed that, at low-temperatures, the system is insulating with a band gap of 1.4 eV, and the Co2+ ions are in the HS state, while Co3+ are in the LS state. At high temperatures (T > 700 K), the charge ordering disappears, and the system becomes metallic with all Co ions in 3d7 electronic configuration and HS state.

Kazak N.V. , Platunov M.S. , Knyazev Y.V. , Molokeev M.S. , Gorev M.V. , Ovchinnikov S.G. , Pchelkina Z.V. , Gapontsev V.V. , Streltsov S.V. , Bartolomé J. , Arauzo A. , Yumashev V.V. , Gavrilkin S.Y. , Wilhelm F. , Rogalev A.
Spin State Crossover in Co3BO5

Physical Review B (started in 2016). 2021. V.103. N9. 094445 :1-19. DOI: 10.1103/physrevb.103.094445 WOS Scopus РИНЦ ANAN OpenAlex

Full text from publisher

Submitted:	Sep 15, 2020
Published print:	Mar 1, 2021
Accepted:	Mar 8, 2021
Published online:	Mar 31, 2021

Web of science:	WOS:000646429500002
Scopus:	2-s2.0-85103836992
Elibrary:	46762848
Chemical Abstracts:	2021:884394 \| 175:58286
OpenAlex:	W3086175402

DB	Citing
Web of science	23
Scopus	24
OpenAlex	23