Journal Article

PUBDB-2023-07280

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Role of cationic size mismatch and effect of disorder in mixed valent manganites

Khatun, A.Extern* ; Aich, P.Extern* ; Topwal, D. (Corresponding author)Extern*

2023
American Inst. of Physics New York, NY

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Please use a persistent id in citations: doi:10.1063/9.0000526  doi:10.3204/PUBDB-2023-07280

Abstract: Comparative studies of structure, magnetism, and magnetoresistance (MR) have been carried out in A-site ordered NdBaMn$_2$O$_6$ (O-NB), A-site disordered NdBaMn$_2$O$_6$ (D-NB) and A-site disordered NdCaMn2O6 (D-NC). O-NB, where A-site cations, Nd$^{3+}$ and Ba$^{2+}$ (of different ionic sizes) are arranged periodically, undergoes structural transition with temperature, while no structural change is present in D-NB where A-site cations are arranged randomly. However, structural transitions are observed in D-NC where Nd$^{3+}$ and Ca$^{2+}$ have similar ionic sizes. Magnetization (M) data shows O-NB has AFM ground state associated with a lower structurally symmetric phase and an FM ground state is observed for D-NB with higher structural symmetry. However, AFM ground state is observed in D-NC similar to that of O-NB. Both the disorder systems exhibit semiconductive transport characteristics over the entire temperature range. The resistivity data of disorder compounds have been fitted with different theoretical models to elucidate the conduction process in these systems. Further, MR studies depict a three times higher value of MR in both disorder compounds compared to that of order one. However, the behavior of MR with H is different for D-NB and D-NC, implying a different origin of this large MR in these compounds. We believe that the different magnetic ground state of D-NB and D-NC is the possible origin of their distinct MR behavior to the magnetic field.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. INDIA-DESY - INDIA-DESY Collaboration (2020_Join2-INDIA-DESY) (2020_Join2-INDIA-DESY)

Experiment(s):

1. PETRA Beamline P02.1 (PETRA III)

Appears in the scientific report 2023

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