This article is cited in
31 papers
CONDENSED MATTER
Magnetization, magnetoelectric polarization, and specific heat of HoGa$_3$(BO$_3$)$_4$
N. V. Volkova,
I. A. Gudima,
E. V. Eremina,
A. I. Begunovb,
A. A. Demidovb,
K. N. Boldyrevc a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
b Bryansk State Technical University
c Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow
Abstract:
A comprehensive experimental and theoretical study of magnetic, magnetoelectric, thermal, and spectroscopic characteristics of HoGa
$_3$(BO
$_3$)
$_4$ gallium borate single crystals has been performed. A large magnetoelectric effect exceeding its values found in all iron and aluminum borates except HoAl
$_3$(BO
$_3$)
$_4$ has been observed. The magnetoelectric polarization of HoGa
$_3$(BO
$_3$)
$_4$ equals
$\Delta P_{ba}(B_a)\approx-1020\,$C/m
$^2$ at
$T = 5$ K in a magnetic field of
$9$ T. The theoretical treatment based on the crystal field model for rare-earth ions provides a unified approach for the consistent interpretation of all measured characteristics. The crystal-field parameters are determined. The temperature (in the
$3$–
$300$ K range) and magnetic field (up to
$9$ T) dependences of the magnetization, the Schottky anomaly in the temperature dependence of the specific heat, and its shift in the field
${\mathbf B}\|{\mathbf c}$ are described. To compare the thermal properties of HoGa
$_3$(BO
$_3$)
$_4$ with those of HoAl
$_3$(BO
$_3$)
$_4$ exhibiting record values of the polarization, the specific heat of HoAl
$_3$(BO
$_3$)
$_4$ at various B values and the temperature dependence of the polarization
$\Delta P_b(T)$ in the applied magnetic field of
$9$ T have been measured.
Received: 08.11.2013
DOI:
10.7868/S0370274X14020039