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CONDENSED MATTER
EPR-determined anisotropy of the $g$-factor and magnetostriction of a Cu$_2$MnBO$_5$ single crystal with a ludwigite structure
A. A. Doubrovskiya,
M. V. Rautskiia,
E. M. Moshkinaa,
I. V. Yatsykb,
R. M. Ereminab a Kirensky Institute of Physics, Federal Research Center KRC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
b Zavoisky Physical–Technical Institute, Russian Academy of Sciences, Kazan, Russia
Abstract:
Electron paramagnetic resonance (EPR) and magnetostriction of the Cu
$_2$MnBO
$_5$ single crystal have been studied. The EPR spectrum consists of a single Lorentzian line due to the exchange-coupled system of spins of Cu
$^{2+}$ and Mn
$^{3+}$ ions. It has been established experimentally that the
$g$-factor in the paramagnetic region is strongly anisotropic and anomalously small, which is not typical of the exchange-coupled system of spins of Cu
$^{2+}$ and Mn
$^{3+}$ ions. At a temperature of
$150$ K, the
$g$-factors along the crystallographic
$a$,
$b$, and
$c$ axes are
$2.04$,
$1.96$, and
$1.87$, respectively. Such small effective
$g$-factor values can be due to the effect of the anisotropic Dzyaloshinskii–Moriya exchange interaction between the spins of Cu
$^{2+}$ and Mn
$^{3+}$ ions directed along the
$a$ axis. The presence of two Cu
$^{2+}$ and Mn
$^{3+}$ Jahn-Teller ions occupying four nonequivalent positions in the crystal is responsible for the absence of the inversion center. It is found that the behavior of the magnetostriction of Cu
$_2$MnBO
$_5$ is not typical of transition-metal crystals but is closer to the behavior of crystals containing rare-earth ions.
Received: 19.10.2017
DOI:
10.7868/S0370274X17230059