Abstract:
Electron paramagnetic resonance (EPR) spectra of a GdMnO3/SrTiO$_3$ thin film in the $X$ band have been measured in the temperature interval from $200$ to $450$ K. Signals from two types of paramagnetic centers have been observed in the spectra. The first paramagnetic center is a subsystem of Gd$^{3+}$ ions, in the EPR spectrum of which the fine structure lines are resolved below $350$ K. The second paramagnetic center is a system of manganese and gadolinium ions, in the EPR spectrum of which an exchange-narrowed line is observed with the width $\Delta H$ several times less than the width $\Delta H$ of an exchange-narrowed line observed in the GdMnO$_3$ single crystal. Unusual magnetic properties are due to the mismatch of the lattice parameters of the GdMnO$_3$ thin film and the SrTiO$_3$ substrate.
Citation:
T. P. Gavrilova, R. M. Eremina, I. V. Yatsyk, I. I. Fazlizhanov, A. A. Rodionov, D. V. Mamedov, N. V. Andreev, V. I. Chichkov, Ya. M. Mukovskii, “EPR spectra of a GdMnO3 thin film on a SrTiO$_3$ substrate”, Pis'ma v Zh. Èksper. Teoret. Fiz., 98:7 (2013), 434–438; JETP Letters, 98:7 (2013), 380–383
T. Basu, D. T. Adroja, F. Kolb, H.-A. Krug von Nidda, A. Ruff, M. Hemmida, A. D. Hillier, M. Telling, E. V. Sampathkumaran, A. Loidl, S. Krohns, Phys. Rev. B, 96:18 (2017)