Irreversibility of the magnetic state of Tm1-xTbxCo2 revealed by specific heat, electrical resistivity, and neutron diffraction measurements / Baranov NV,Yermakov AA,Pirogov AN,Proshkin AV,Gvasaliya SN,Podlesnyak A // PHYSICAL REVIEW B. - 2006. - V. 73, l. 10.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

The substitution of Tb for Tm in the Laves phase compound TmCo2 leads to appearance of a magnetic moment on the Co atoms through the metamagnetic transition in the itinerant d-electron subsystem and gives rise to long-range ferrimagnetic order in Tm1-xTbxCo2 at x >= 0.15. The magnetic state of the compound Tm0.9Tb0.1Co2, i.e., just below the critical Tb concentration, is characterized by the presence of large regions with short-range magnetic order and localized spin fluctuations (LSFs) induced in the Co 3d-electron subsystem by the fluctuating f-d exchange due to the Tm-Tb substitution. The peculiar magnetic state of this compound is strongly influenced by an external magnetic field which produces a first-order magnetic phase transition to a long-range ferrimagnetic state with the magnetic moment on the Co atoms up to (0.7-0.8)mu(B). This field-induced transition in Tm0.9Tb0.1Co2 is found to be irreversible. It is accompanied by a giant and irreversible reduction of the electrical resistivity (Delta rho/rho similar to-45\%), specific heat (by about 3.7 times at 2 K), and intensity of magnetic neutron scattering. Such behavior is associated with the field-induced metamagnetic transition in the itinerant d-electron subsystem mediated by the f-d exchange. Significantly enhanced values of the residual resistivity and the coefficient gamma of the T-linear contribution to the specific heat in the compound with x=0.1 as well as their unusual behavior with temperature and under application of the magnetic field is ascribed to the presence of LSF.

Author keywords:

ELECTRONIC SPECIFIC-HEAT; METAMAGNETIC TRANSITION; PHYSICAL-PROPERTIES; PHASE-TRANSITIONS; LAVES PHASE; RARE-EARTH; TMCO2; ORDER; CO; ONSET

DOI:

10.1103/PhysRevB.73.104445

Web of Science ID:

ISI:000236467200093

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAR
Publisher	AMERICAN PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	104445
Keywords-Plus	ELECTRONIC SPECIFIC-HEAT; METAMAGNETIC TRANSITION; PHYSICAL-PROPERTIES; PHASE-TRANSITIONS; LAVES PHASE; RARE-EARTH; TMCO2; ORDER; CO; ONSET
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	nikolai.baranov@usu.ru
ResearcherID-Numbers	Baranov, Nikolai/J-5042-2013 Podlesnyak, Andrey/A-5593-2013 Pirogov, Alexander/K-8115-2013 Proshkin, Alexey/J-7180-2013
ORCID-Numbers	Baranov, Nikolai/0000-0002-9720-5314 Podlesnyak, Andrey/0000-0001-9366-6319 Pirogov, Alexander/0000-0001-7321-1245 Proshkin, Alexey/0000-0002-2631-6834
Number-of-Cited-References	42
Usage-Count-Since-2013	17
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	028DN