Detection of gap in the low-frequency AFMR mode and magnetic phase transitions in Gd2CuO4
A. I. ZvyaginPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. A. StepanovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovВ. А. ПащенкоPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovM. I. KobetsPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. S. PanfilovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovS. N. BariloPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovD. I. ZhigunovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
Resonance and magnetic measurements of Gd2CuO4 single crystals have been made at low temperatures including the region of magnetic ordering of the gadolinium subsystem. It is found that there is a gap ω10/2π ≃ 10 GHz (T = 4.2 K) in the low frequency AFMR mode, and the magnetic structure of Gd2CuO4 in weak magnetic fields undergoes an orientation phase transition (Hc ≃ 3.5 kOe) according to the AFMR data, Hc1 ≃ 2 kOe and Hc2 ≃ 5.5 kOe according to the magnetic measurement data for different magnetic field orientations in the (a, b plane).
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