Specific heat and magnetocaloric effect study of multiple field-induced phase transitions in HoGa2 / Aoki Y,Urakawa J,Sugawara H,Sato H,Markin PE,Bostrem IG,Baranov NV // PHYSICAL REVIEW B. - 2000. - V. 62, l. 13. - P. 8935-8941.

ISSN/EISSN:

2469-9950 / 2469-9969

Type:

Article

Abstract:

Both temperature and field dependences of specific heat C and magnetocaloric effect (MCE) were measured on a HoGa2 single crystal in fields up to 8 T at low temperatures down to 0.1 K. The magnetic fields were applied in the {[}100] direction, for which intermediate magnetic phases appear. Significantly Ho nuclear contribution to C is found to dominate below 1 K and its field-independent character reveals that the value of Ho magnetic moments does not change visibly in the measured field range irrespective of the magnetic phases. From anomalies observed in the C and MCE data, the reported held-vs-temperature phase diagram is corroborated thermodynamically. One of the phase transitions occurring at T-t = 6.6 K in zero field is found to be of first-order transition. Magnetic entropy determined by the MCE measurements shows an enhancement in the intermediate phases and small humps at the phase boundaries. Based on a crystalline-electric-field model, the nuclear specific heat, magnetic entropy of the 4f electrons, and anisotropy in the magnetization;can be explained consistently. Possible origins of the reported giant magnetoresistance caused by the appearance of the intermediate phases will be discussed.

Author keywords:

MAGNETORESISTANCE; SYSTEMS; NDGA2

DOI:

10.1103/PhysRevB.62.8935

Web of Science ID:

ISI:000089733800071

Соавторы в МНС:

Другие поля

Поле	Значение
Month	OCT 1
Publisher	AMER PHYSICAL SOC
Address	ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Language	English
EISSN	2469-9969
Keywords-Plus	MAGNETORESISTANCE; SYSTEMS; NDGA2
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
ResearcherID-Numbers	Baranov, Nikolai/J-5042-2013 Markin, Pavel/K-7088-2013 Aoki, Yuji/E-5494-2015 C, Y/G-5456-2010
ORCID-Numbers	Baranov, Nikolai/0000-0002-9720-5314 Markin, Pavel/0000-0002-9537-2303 Aoki, Yuji/0000-0002-0957-3396
Number-of-Cited-References	17
Usage-Count-Since-2013	6
Journal-ISO	Phys. Rev. B
Doc-Delivery-Number	361QH