F. A. Garcia, P. Marques-Ferreira, J. G. S. Duque, D. J. Garcia, P. G. Pagliuso, N. S. Camilo, A. O. Garcia Rodriguez, R. Lora-Serrano
The magnetic properties of the 12R-type hexagonal Perovskites BaTi1/2Mn1/2O3 and Ba0.9La0.1Ti1/2Mn1/2O3 were investigated by means of DC-magnetization and electron spin resonance (ESR) experiments. The data were collected in the temperature (T) interval 2K<=T<=50K. The ESR measurements were performed at both X-band (9.4 GHz) and Q-band (34.4 GHz) frequencies. Our results suggest that the La-substitution on the Ba site induces a long range antiferromagnetic ordering of the Mn moments at low-temperature (TN = 5 K) which competes with a strong magnetic frustration. Furthermore, we suggest that this frustration is an intrinsic property of the system and is not related with sample inhomogeneities. X-ray diffraction data collected at room temperature have confirmed the formation of the trigonal perovskite phases in both cases.
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http://arxiv.org/abs/1206.3813
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