Conventional and inverse magnetocaloric and electrocaloric effects of a
mixed spin-(1/2, 1) Heisenberg dimer
- URL: http://arxiv.org/abs/2311.17478v1
- Date: Wed, 29 Nov 2023 09:38:20 GMT
- Title: Conventional and inverse magnetocaloric and electrocaloric effects of a
mixed spin-(1/2, 1) Heisenberg dimer
- Authors: Hana Vargov\'a and Jozef Stre\v{c}ka
- Abstract summary: The analyzis of two basic magnetocaloric characteristics, the adiabatic change of temperature and the isothermal entropy change, are exactly calculated.
It is found that the application of an electric field during the adiabatic demagnetization process may lead to an enhancement of cooling performance.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The mixed spin-(1/2, 1) Heisenberg dimer accounting for two different Land\'e
$g$-factors is exactly examined in presence of external magnetic and electric
field by considering exchange as well as uniaxial single-ion anisotropies.
Rigorously calculated ground-state phase diagrams affirm existence of three
different types of zero-temperature phase transitions accompanied with a
non-zero value of a residual entropy. Presence of a magnetoelectric effect
accounted within Katsura-Nagaosa-Balatsky mechanism is demonstrated through the
analyzis of the magnetization and dielectric polarization in response to both
external fields. The analyzis of two basic magnetocaloric characteristics, the
adiabatic change of temperature and the isothermal entropy change, achieved
upon variation of external fields, are exactly calculated in order to
investigate the (multi)caloric behavior. The obtained results confirm existence
of both conventional as well as inverse magnetocaloric effects. Utilizing the
refrigeration capacity coefficient it is found that the application of an
electric field during the adiabatic demagnetization process may lead to an
enhancement of cooling performance in the region of conventional magnetocaloric
effect. On the other hand, a sufficiently large electric field can reduce an
inverse caloric effect provided that the electric-field-induced transition from
the fully to partially polarized state is realized.
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