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MA: Fachverband Magnetismus
MA 57: Posters Magnetism II
MA 57.26: Poster
Donnerstag, 19. März 2020, 15:00–18:00, P3
Cation order control of magnetism in double perovskite system — •Supriyo Majumder, M. Tripathi, R. J. Choudhary, and D. M. Phase — UGC-DAE CSR, University campus, Indore-452001, India
The mislocation of transition metal ions in double perovskite (DP) A 2 B ′ B ″ O 6 structures from ideal alternating site occupancy, known as anti-site disordering, have a huge bearing on physical properties. With this motive, we have controlled the B-site disorders and investigated consequent signatures on magnetic ground state of R 2 NiMnO 6 (R= rare earth) DP systems. Ordered RNMO is commonly believed to show two distinct magnetic phase transitions viz, PM-FM transition at T C due to Ni2+-O-Mn4+ super exchange interaction and at T f due to coupling of R spins with Ni-Mn network. In addition, anomalous inverted cusp trend in M(T), two step reversibility loop behavior in M(H) and drastic reduction of M S etc. were observed in the disordered system. Presence of intrinsic anti-site disorder results in an additional AFM coupling, mediated by Ni 2+ -O-Ni 2+ and Mn4+-O-Mn4+ pairs and consequently the competition between long range FM ordering with short scale AFM interaction governs the complex magnetic behavior in RNMO. The present study provides a pathway to control magnetism by proper tunning of cation ordering in DP system.