2014/08/31 by Suchita Pandey, Jitender Kumar, A. M. Awasthi +1 · 7 citations
Materials Science · Physics and Astronomy · #Dielectric properties of ceramics #Ferromagnetism #Isostructural #Magnetic and transport properties of perovskites and related materials #Magnetization #Multiferroics and related materials #Paramagnetism #Supercooling #Superheating #Uncorrelated #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/0022-3727/47/43/435303
published in Journal of Physics D Applied Physics 47(43), 435303 (Institute of Physics) · 16 pages, 5 figures, and 39 references
openalex publication_date 2014/10/06 · arxiv created 2017/07/25 · arxiv updated 2017/07/26 · openalex created_date 2017/07/31 · openalex updated_date 2026/08/06
We explore magneto-dielectricity in La 0.53 Ca 0.47 MnO 3 across its paramagnetic (PMI) to ferromagnetic (FMM) isostructural transition at T C ∼ 253 K, by magnetic ( M ), caloric ( W ), dielectric ( ε ′), magnetoresistive (MR), and magnetocapacitance (MC) investigations. A skew-broadened first-order transition character is confirmed via heating/cooling hystereses in M ( T ) and W ( T ), with a superheating temperature T ** next to T C and supercooling temperature T * exhibiting kinetics. Above T C , linearly related MC and MR reflect purely a magnetoresistance effect. Near T C , the high-frequency MC (5 Tesla (T)), far exceeds the magneto-losses, and is uncorrelated with dc MR (5 T) in the FM-ordered state. The intrinsic magneto-dielectricity manifest below T C and above ∼kHz is traced to an intra-granular Maxwell–Wagner-type effect at the interface region of PMI–FMM phase coexistence.