Magnetic phase transitions, short-range correlations and spin fluctuations in (Gd1-xYx)(3)Co / Baranov NV,Yermakov AA,Markin PE,Possokhov UM,Michor H,Weingartner B,Hilscher G,Kotur B // JOURNAL OF ALLOYS AND COMPOUNDS. - 2001. - V. 329, l. 1-2. - P. 22-30.

ISSN/EISSN:

0925-8388 / нет данных

Type:

Article

Abstract:

The variation of lattice parameters, magnetic, transport and thermodynamic properties were investigated in the pseudobinary system (Gd1-xYx)(3)Co. A field-induced phase transition from the antiferromagnetic to the ferromagnetic state is observed below the Neel temperature, which is accompanied by giant magnetoresistance for x <0.8. The electronic specific heat coefficient, gamma, for Y3Co is found to be significantly lower (15 mJ mol(-1) K-2) than for the isostructural Gd3Co compound ( 109-170 mJ mol(-1) K-2). This remarkable difference in the gamma values is ascribed to a significant spin fluctuation contribution of the d-electron subsystem which is induced by the Gd-subsystem. With increasing yttrium. content the gamma value changes non-monotonously yielding a maximal value as high as 350 mJ mol(-1) K-2 at x=0.8 where also a peak of the residual resistivity is observed. For lower Y content (x <0.4) the magnetic contribution to the entropy S-m deviates significantly from the theoretical value S-m(max) = 3R(1-x)ln 8 even at temperatures of about two times T-N. The discrepancy between S-m and S-m(max) in the paramagnetic region as well as the saturation of the electrical resistivity at T >T-N in Gd,Co is attributed to the presence of Short-range correlations between Gd-moments and to spin fluctuations in the d-electron subsystem well above the ordering temperature. (C) 2001 Elsevier Science B.V. All rights reserved.

Author keywords:

rare earth compounds; magnetically ordered materials; electric transports; magnetoresistance; specific heat R3NI

DOI:

10.1016/S0925-8388(01)01585-7

Web of Science ID:

ISI:000171818000007

Соавторы в МНС:

Другие поля

Поле	Значение
Month	NOV 14
Publisher	ELSEVIER SCIENCE SA
Address	PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Language	English
Keywords-Plus	R3NI
Research-Areas	Chemistry; Materials Science; Metallurgy \& Metallurgical Engineering
Web-of-Science-Categories	Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy \& Metallurgical Engineering
ResearcherID-Numbers	Baranov, Nikolai/J-5042-2013 Markin, Pavel/K-7088-2013
ORCID-Numbers	Baranov, Nikolai/0000-0002-9720-5314 Markin, Pavel/0000-0002-9537-2303 Michor, Herwig/0000-0003-1642-5946 Possokhov, Yuri/0000-0002-3570-4337
Number-of-Cited-References	25
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	8
Journal-ISO	J. Alloy. Compd.
Doc-Delivery-Number	486KY