Anomalous influence of spin fluctuations on the heat capacity and entropy in a strongly correlated helical ferromagnet MnSi / Povzner A. A.,Volkov A. G.,Nogovitsyna T. A. // PHYSICS OF THE SOLID STATE. - 2017. - V. 59, l. 2. - P. 217-222.

ISSN/EISSN:

1063-7834 / 1090-6460

Type:

Article

Abstract:

The influence of spin fluctuations on the thermodynamic properties of a helical ferromagnet MnSi has been investigated in the framework of the Hubbard model with the electronic spectrum determined from the first-principles LDA + U + SO calculation, which is extended taking into account the Hund coupling and the Dzyaloshinskii-Moriya antisymmetric exchange. It has been shown that the ground state of the magnetic material is characterized by large zero-point fluctuations, which disappear at the temperature T{*} (< T (c) is the temperature of the magnetic phase transition). In this case, the entropy abruptly increases, and a lambdashaped anomaly appears in the temperature dependence of the heat capacity at constant volume (C (V) (T)). In the temperature range T{*} < T < T (c) , thermal fluctuations lead to the disappearance of the inhomogeneous magnetization. The competition between the increase in the entropy due to paramagnon excitations and its decrease as a result of the reduction in the amplitude of local magnetic moments, under the conditions of strong Hund exchange, is responsible for in the appearance of a ``shoulder{''} in the dependence C (V) (T)).

Author keywords:

MONOSILICIDES

DOI:

10.1134/S1063783417020226

Web of Science ID:

ISI:000394986300001

Соавторы в МНС:

Другие поля

Поле	Значение
Month	FEB
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1090-6460
Keywords-Plus	MONOSILICIDES
Research-Areas	Physics
Web-of-Science-Categories	Physics, Condensed Matter
Author-Email	a.a.povzner@urfu.ru
ResearcherID-Numbers	Povzner, Aleksandr/A-4625-2016
Number-of-Cited-References	18
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	4
Journal-ISO	Phys. Solid State
Doc-Delivery-Number	EM0CL