Anomalous magnetic properties of RCrTiO5 (R= Dy and Ho) compounds

摘要: We have investigated the nature of magnetic ground state of RCrTiO 5 (R= Dy and Ho) through dc magnetization and heat capacity measurements. Due to the strong competition between the Cr 3+ and R 3+ sublattice moments, several intriguing phenomena have been observed when the magnetic state is probed at low field. In both the systems, the Cr 3+ sublattice undergoes a long-range antiferromagnetic ordering below∼ 139 K with a weak ferromagnetic (FM) moment perpendicular to c axis as evident from the hysteresis in M (H) curve. At low fields (150 Oe), the zero-field-cooled magnetization shows that the FM component of Cr 3+ spin and R 3+ moments align in the opposite direction with respect to each other and the net moment aligns in the opposite direction to the applied field in the temperature range 136–16 K for DyCrTiO 5 and below 128 K for HoCrTiO 5. For both the samples, the strong coupling …