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Critical magnetic inhomogeneities and crossover electrical transport properties in La0.4Bi0.6Mn0.99Ga0.01O3 manganite

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Abstract

The polycrystalline compound La0.4Bi0.6Mn0.99Ga0.01O3 has been studied for its interesting structural, magnetic and electrical transport properties. The compound has been synthesized using nitrate reaction route with the incorporation of controllable temperature cycling method. The phase purity of the studied compound has been verified from the X-ray diffraction and Reitveld refinement technique/analysis. The microstructural studies of the synthesized compound suggest proper crystalline shapes and elemental confirmation of the composition. The magnetization measurements carried out on the studied compound reveal that at low temperature, the magnetic spins exhibit glassy behavior and near phase transition temperature the inhomogeneity due to the critical frustrations. Further from the AC susceptibility measurements the low temperature magnetic spin interaction is found to be a manifestation of re-entrant spin glass like behavior, and from critical analysis, the magnetic inhomogeneity at phase transitions has been evidenced. The transport properties from the conductivity measurements carried out on the studied compound are understood based on the polaronic hopping model. Further at temperatures greater than the Debye temperature, the polaronic conduction follows small polaronic hopping mechanism and at temperatures less than the Debye temperature the polaronic conduction crossover to Mott’s variable range hopping mechanism. The magneto-conductivity measurements studied for the compound reveal the quadratic dependencies above the magnetic critical temperatures, where scattering mechanism is due to the phonon–polaron interactions.

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Acknowledgements

This research was supported in part by the International Centre for Theoretical Sciences (ICTS) via the program—Novel Phases of Quantum Matter (Code: ICTS/topmatter2019/12). I am greatly indebted to DAE-BRNS, Government of India for junior research fellowship (JRF) and senior research fellowship (SRF) (2011–2015), Maharaja Research Foundation (MRF) for the extended SRF fellowship (2015–2017) and Indian Institute of Science, Bangalore, for project research fellowship (2017-2018) under Dr. Srimanta Middey (IISC Startup, Capital and Revenue Manpower Grant: 78-0103-0020-01-436). I am extremely grateful to Dr. Rajeev Rawat and Mr. Sachin of UGC-DAE CSR, Indore for conductivity measurements. I am also grateful to Dr. T. K. Nath, Department of Physics and Astronomy, Indian Institute of Technology, Kharagpur for the Ac Susceptibility measurements. Finally, I thank Dr. Ravi L. Hadimani, Virginia Commonwealth University, USA and Dr. David C. Jiles, FRS, Palmer Endowed Departmental Chair in Electrical and Computer Engineering, Iowa State University, USA for their continuous support.

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  1. Department of Physics, Acharya Institute of Graduate Studies, Bangalore, Karnataka, 560107, India

    V. Punith Kumar

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Kumar, V.P. Critical magnetic inhomogeneities and crossover electrical transport properties in La0.4Bi0.6Mn0.99Ga0.01O3 manganite. Indian J Phys 96, 1393–1404 (2022). https://doi.org/10.1007/s12648-021-02090-5

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