Layer-preferential substitutions and magnetic properties of pyrrhotite-type Fe7-yMyX(8) chalcogenides (X = S, Se; M = Ti, Co) / Baranov N. V.,Ibrahim P. N. G.,Selezneva N. V.,Gubkin A. F.,Volegov A. S.,Shishkin D. A.,Keller L.,Sheptyakov D.,Sherstobitova E. A. // JOURNAL OF PHYSICS-CONDENSED MATTER. - 2015. - V. 27, l. 28.

ISSN/EISSN:

0953-8984 / 1361-648X

Type:

Article

Abstract:

A comparative study of four series of pyrrhotite-type chalcogenide compounds Fe7-yMyX8 (X = S, Se) with substitution of Ti or Co for iron has been performed by means of x-ray and neutron powder diffraction, and by magnetization measurements. In Fe7-yMyX8 compounds having a ferrimagnetic order at y = 0, the substitution of either Ti or Co for iron is observed to result in a monotonous decrease of the magnetic ordering temperature, while the resultant magnetization shows a non-monotonous behavior with a minimum around y = 1.0-1.5 in all the Fe7-yMyX8 families except Fe7-yCoySe8. Suppression of a magnetically ordered state with substitutions in Fe7-yMyX8 is ascribed to nearly zero values of Ti and Co magnetic moments, while the non-monotonous changes of the resultant magnetization are explained by the compensation of the sublattice magnetizations due to the non-random substitutions in alternating metallic layers. The difference in the cation partitioning observed in Fe7-yTiyX8 and Fe7-yCoyX8 is attributed to the difference in the spatial extension of Ti and Co 3d orbitals. High coercive field values (20-24 kOe) observed at low temperatures in the Ti-containing compounds Fe7-yTiyX8 with y >= 3 are suggested to result from the enhancement of Fe orbital moment due to the Ti for Fe substitution.

Author keywords:

pyrrhotite; superstructure; non-random substitution; ferrimagnetic order; magnetization; coercive field; neutron diffraction IRON SELENIDE FE7SE8; NIAS-TYPE STRUCTURE; NEUTRON-DIFFRACTION; COMPENSATION TEMPERATURE; PHASE-TRANSITIONS; COERCIVE FORCE; FE; SUPERCONDUCTIVITY; COMPOUND; PRESSURE

DOI:

10.1088/0953-8984/27/28/286003

Web of Science ID:

ISI:000357498200012

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL 22
Publisher	IOP PUBLISHING LTD
Address	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
Language	English
Article-Number	286003
EISSN	1361-648X
Keywords-Plus	IRON SELENIDE FE7SE8; NIAS-TYPE STRUCTURE; NEUTRON-DIFFRACTION; COMPENSATION TEMPERATURE; PHASE-TRANSITIONS; COERCIVE FORCE; FE; SUPERCONDUCTIVITY; COMPOUND; PRESSURE
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	baranov@imp.uran.ru
ResearcherID-Numbers	Gubkin, Andrey/J-3240-2013 Sheptyakov, Denis/F-5333-2016 Baranov, Nikolai/J-5042-2013 Sherstobitova, Elena/J-8072-2013 Shishkin, Denis/K-5766-2013
ORCID-Numbers	Gubkin, Andrey/0000-0002-4280-7561 Sheptyakov, Denis/0000-0002-3001-6586 Baranov, Nikolai/0000-0002-9720-5314 Sherstobitova, Elena/0000-0002-4443-1318 Shishkin, Denis/0000-0001-5225-3120
Funding-Acknowledgement	Ministry of Education and Science of Russia {[}1362]; Russian Foundation for Basic Research {[}13-02-00364, 13-02-96038]; program of UB of RAS {[}15-17-2-22]; Government of Sverdlovsk region
Funding-Text	This work is partly based on experiments performed at the Swiss spallation neutron source SINQ, Paul Scherrer Institute, Villigen, Switzerland. This work was supported by the Ministry of Education and Science of Russia (project No 1362), by the Russian Foundation for Basic Research (projects No 13-02-00364 and 13-02-96038), by the program of UB of RAS (project No 15-17-2-22) and by the Government of Sverdlovsk region.
Number-of-Cited-References	50
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	32
Journal-ISO	J. Phys.-Condes. Matter
Doc-Delivery-Number	CM2GP