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Magnetic phase transitions leading to Griffith’s singularity with electrical and dielectric anomalies in transport properties of LaMnO3+δ

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Abstract

The polycrystalline LaMnO3+δ has been investigated and studied in detail for its structural, magnetic, electrical transport and dielectric properties. Perovskite manganites like LaMnO3+δ is intrinsically inhomogeneous and exhibit disorders, which lead to different types of critical phenomenon. The magnetization measurement suggests the occurrence of Griffith’s phase (means no clear phase separation in this region) like phenomenon arising above critical temperature TC. This is also reflected as a small hump in electrical resistivity measurement about the same temperature as observed in magnetization measurements. The occurrence of Griffith’s phase-like phenomenon arising above the critical temperature TC in LaMnO3+δ manganites is found due to the quenched disorder in the co-operative interactions of the frustrated magnetic spins. The analysis of electrical resistivity measurements further suggests that the transport properties in this region follows Shklovskii–Efros variable range hopping (SE-VRH) mechanism, as the sample encompass disorder and frustration. The Magneto-resistance (MR) at different temperatures measured with respect to the applied magnetic field further concludes the characteristic dependent on Brillouin function. The Dielectric measurements carried out on the sample exhibits multiple relaxation behavior, which is understood using combined Debye-Maxwell Wagner relaxor dynamics.

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Acknowledgements

This research was supported in part by the International Centre for Theoretical Sciences (ICTS) during a visit for the program—Novel phases of quantum matter (Code: ICTS/topmatter2019/12). I am greatly indebted to DAE-BRNS for junior research fellowship (JRF) and senior research fellowship (SRF) (2011–2015), Maharaja Research Foundation (MRF) for the extended SRF research 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 thank Dr Kalavathi of IGCAR, Kalpakkam, for the XRD measurements. I gratefully acknowledge Dr D Das and Mr P V Rajesh of UGC-DAE CSR, Kolkata, for the DC magnetization measurements. I am also extremely grateful to Dr Rajeev Rawat and Mr Sachin of UGC-DAE CSR, Indore, for electrical resistivity measurements. I am also grateful to Dr S K Deshpande of UGC-DAE CSR, Mumbai, for dielectric measurements. Finally, I thank Dr Ravi L Hadimani, Virginia Commonwealth University, USA and Dr David C Jiles, FRS, Palmer Endowed Department Chair in Electrical and Computer Engineering, Iowa State University, USA, for their continuous support and inspirations.

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

    V Punith Kumar

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Kumar, V.P. Magnetic phase transitions leading to Griffith’s singularity with electrical and dielectric anomalies in transport properties of LaMnO3+δ. Bull Mater Sci 44, 136 (2021). https://doi.org/10.1007/s12034-021-02426-1

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