Disappearance of Ising nature in Ca₃ZnMnO₆ studied by high-field ESR

Abstract

High-field electron spin resonance measurements of an antiferromagnet Ca3ZnMnO6 isostructure, with the Ising-chain multiferroic Ca3CoMnO6, have been carried out. Two distinct resonance modes were observed below TN = 25 K, which is well explained by conventional antiferromagnetic resonance theory with easy-plane anisotropy. The zero-field spin gap is derived to be about 166 GHz, originating from the easy-plane anisotropy and exchange interaction. Our result suggests that the Dzyaloshinsky-Moriya interaction, which may induce spin canting, is absent. Disappearance of Ising anisotropy in Ca3ZnMnO6 suggests that the Co(4+) ion, as well as the Co-Mn superexchange, plays an important role for the Ising nature in Ca3CoMnO6.

Strong ferromagnetism induced by canted antiferromagnetic order in double perovskite iridates(La1−xSrx)2ZnIrO6Zhu1, Lu2, Wei3 et al. 2015Phys. Rev. B525120View full textAdd to dashboardCite

“…Ir 4+ ions form a quasi-FCC lattice in La 2 ZnIrO 6 , therefore some frustration may also exist, as observed in some other 5d double perovskite compounds [55,56]. It is possible that the zero-field resonance frequency matches with the microwave frequency in the short-range ordered state and it deviates slightly when the temperature is decreased [50,57], leading to a suppression of signal. Frequency-dependent AFM resonance measurements will be carried out in the near future to verify this scenario.…”

First principles study of the electronic structure and magnetic properties of spin chain compounds: Ca3ZnMnO6and Ca3ZnCoO6

“…The compound Ca 3 ZnMnO 6 shows long range antiferromagnetic order at low temperature (∼10 K) [14]. A recent high field ESR study suggest absence of Ising like behavior for this system [15]. The experimental results for Ca 3 ZnCoO 6 show a ferromagnetic, nonlinear field dependence of magnetization below 90 K, with a hysteresis appearing just below 25 K [14].…”