Butterflylike specific heat, magnetocaloric effect, and itinerant metamagnetism in (Er,Y)Co-2 compounds / Baranov N. V.,Proshkin A. V.,Czternasty C.,Meissner M.,Podlesnyak A.,Podgornykh S. M. // PHYSICAL REVIEW B. - 2009. - V. 79, l. 18.

ISSN/EISSN:

1098-0121 / нет данных

Type:

Article

Abstract:

The field-induced first-order phase transition in (Er1-xYx)Co-2 with the yttrium concentration x=0.45 is observed to be accompanied by a butterflylike behavior and significant irreversibility of the specific heat. The coefficient gamma of the T-linear specific heat decreases by similar to 48\% under application and removal of a magnetic field up to 20 kOe. This behavior is attributed to the itinerant electron metamagnetism of Co 3d electrons. The isothermal magnetic entropy change Delta S-m in Er0.55Y0.45Co2 includes a large contribution associated with spin fluctuations induced by the f-d exchange interaction in the hybridized 3d-5d-electron subsystem. These spin fluctuations are suggested to contribute substantially to the magnetocaloric effect of the RCo2 type compounds. The maximal Delta S-m value observed for ErCo2 just above the Curie temperature is ascribed to the closeness of the T-C value to the spin-fluctuation temperature T-sf of itinerant Co 3d electrons. The nonmonotonous change in Delta S-m with the Curie temperature of (R1-xRxCo2)-Co-' compounds is explained by the temperature variation in the spin-fluctuation contribution to the magnetocaloric effect.

Author keywords:

Curie temperature; entropy; erbium compounds; magnetocaloric effects; metamagnetism; specific heat; spin fluctuations; yttrium compounds HIGH MAGNETIC-FIELDS; ELECTRON METAMAGNETISM; SPIN FLUCTUATIONS; RCO(2) COMPOUNDS; RCO2 COMPOUNDS; TRANSITION; TEMPERATURE; CAPACITY; SYSTEM; ERCO2

DOI:

10.1103/PhysRevB.79.184420

Web of Science ID:

ISI:000266501200073

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
Article-Number	184420
Keywords-Plus	HIGH MAGNETIC-FIELDS; ELECTRON METAMAGNETISM; SPIN FLUCTUATIONS; RCO(2) COMPOUNDS; RCO2 COMPOUNDS; TRANSITION; TEMPERATURE; CAPACITY; SYSTEM; ERCO2
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	nikolai.baranov@usu.ru
ResearcherID-Numbers	Podlesnyak, Andrey/A-5593-2013 Proshkin, Alexey/J-7180-2013 Baranov, Nikolai/J-5042-2013 C, Y/G-5456-2010 Podgornykh, Sergey/J-3583-2013
ORCID-Numbers	Podlesnyak, Andrey/0000-0001-9366-6319 Proshkin, Alexey/0000-0002-2631-6834 Baranov, Nikolai/0000-0002-9720-5314 Podgornykh, Sergey/0000-0002-4942-4862
Funding-Acknowledgement	RAS {[}01.2.006 13391]; Department of Energy {[}DE-AC05-00OR22725]
Funding-Text	This work was supported by the RAS Program (Project No. 01.2.006 13391). ORNL/SNS is managed by UT-Battelle, LLC, for the U. S. Department of Energy under Contract No. DE-AC05-00OR22725.
Number-of-Cited-References	53
Usage-Count-Since-2013	31
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	451WI