Phase relations and superconductivity in the Fe-7(Se1-yTey)(8) system: Effect of phase coexistence / Baranov N. V.,Abouhaswa A. S.,Selezneva N. V.,Kazantsev V. A.,Ibrahim P. N. G. // SOLID STATE SCIENCES. - 2016. - V. 61, l. . - P. 136-145.

ISSN/EISSN:

1293-2558 / 1873-3085

Type:

Article

Abstract:

The effect of the Te for Se substitution in the Fe7Se8 compound having a layered NiAs-type structure has been studied by means of X-ray diffraction, scanning electron microscopy, thermal expansion, electrical resistivity and magnetization measurements. The growth of Te tellurium content in Fe-7(Se1-yTey)(8) above y similar to 0.15 is found to result in the phase segregation; besides the NiAs-type phase the superconducting tetragonal PbO-type phase appears in these samples. It has been observed that the crystal structure and composition of the hexagonal Fe-7(Se, Te)(8) phase (P6(3)/mmc) transforms with increasing Te content to the CdI2-type phase (P (3) over bar m1) and then to the monoclinic Fe-3(Se, Te)(4)-type phase (I12/m1). The concentration intervals in which these NiAs-type phases coexist with the tetragonal phase have been determined. At y >= 0.4, the Fe-7(Se1-yTey)(8) samples show bulk superconductivity with higher superconducting transition temperatures (T-c up to 17.8 K) compared with single-phase samples of Fe(Se, Te). Such an enhancement is suggested to result from the interactions between the superconducting and non-superconducting phases coexisting in Fe-7(Se1-yTey)8. (C) 2016 Elsevier Masson SAS. All rights reserved.

Author keywords:

TRANSITION-METAL DICHALCOGENIDES; MAGNETIC-PROPERTIES; IRON SELENIDE; FE7SE8; CHEMISTRY; FESE; NANOSTRUCTURES; DIFFRACTION; FE3SE4

DOI:

10.1016/j.solidstatesciences.2

Web of Science ID:

ISI:000388091600022

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
EISSN	1873-3085
Keywords-Plus	TRANSITION-METAL DICHALCOGENIDES; MAGNETIC-PROPERTIES; IRON SELENIDE; FE7SE8; CHEMISTRY; FESE; NANOSTRUCTURES; DIFFRACTION; FE3SE4
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical; Physics, Condensed Matter
Author-Email	baranov@imp.uran.ru
ResearcherID-Numbers	Baranov, Nikolai/J-5042-2013 kazantsev, vadim/J-5186-2013
ORCID-Numbers	Baranov, Nikolai/0000-0002-9720-5314 kazantsev, vadim/0000-0003-2407-6280
Funding-Acknowledgement	RFBR {[}16-02-00480, 16-03-00733]; Ministry of Education and Science of Russia {[}1362]; Ural Branch of RAS {[}15-17-2-22]
Funding-Text	The present work was supported by RFBR (projects No 16-02-00480 and No 16-03-00733), by the Ministry of Education and Science of Russia (project No 1362) and by the Ural Branch of RAS (Project No 15-17-2-22). Authors are grateful for Dr. A.S. Volegov for the assistance in the magnetic characterization of synthesized samples.
Number-of-Cited-References	51
Usage-Count-Last-180-days	12
Usage-Count-Since-2013	21
Journal-ISO	Solid State Sci.
Doc-Delivery-Number	EC4IP