Magnetic and electrical transport of the cation-deficient LaMnO3: Common origin for both Sr-doping and self-doping effects

S. Das; P. Roychowdhury; S. De; A. Roy; S. Chatterjee; K. De

doi:10.1016/j.physb.2018.05.004

Magnetic and electrical transport of the cation-deficient LaMnO₃: Common origin for both Sr-doping and self-doping effects

S. Das, P. Roychowdhury, S. De, A. Roy, S. Chatterjee, K. De

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We have investigated the effect of cation deficiency on the electric and magnetic properties of LaMnO₃ in terms of both substitution of La by a divalent ion (Sr²⁺) and creating La-deficiency. The temperature and magnetic field dependence of electrical resistivity (ρ) and dc magnetization were studied. All the compounds are to be found in rhombohedral structure. The excess oxygen in all compounds was detected through iodometric titration. The metal to semiconducting transition and the paramagnetic to ferromagnetic transition is found to decrease with Mn⁴⁺ for all samples. The occurrence of magnetoresistance (MR) at low temperature and low field for La-deficient compounds is suggested due to the tunneling of electron through the grain boundary (GB). The nonlinear current-voltage (I–V) characteristic for La-deficient compounds indicates inelastic tunneling via localized states dominate the transport mechanism.

Original language	English
Pages (from-to)	17-22
Number of pages	6
Journal	Physica B: Condensed Matter
Volume	544
DOIs	https://doi.org/10.1016/j.physb.2018.05.004
State	Published - 1 Sep 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018

Funding

The authors acknowledge the support from UGC-DAE , Mumbai under CRS Project Ref. No. UDCSR/MUM/CD/CRS-M-254/2017/1024 . The work was supported by UGC major research project no. 42/908/2013 (SR). One of the authors (S.De) wishes to thank to CSIR, India for providing JRF fellowship. We thank Dr. S. Giri and Dr. S. Majumdar for accessing their laboratory in Department of Physics, Indian Association for the Cultivation of Science, India. We are thankful to UGC-DAE CSR, Kolkata, India for providing X-ray diffraction measurement facility. We would also like to thank Dr. B. Sarkar, Bijoy Kumar Singha and Sunanda Chatterjee for their consistent inspiration during paper compilation. The authors acknowledge the support from UGC-DAE, Mumbai under CRS Project Ref. No. UDCSR/MUM/CD/CRS-M-254/2017/1024. The work was supported by UGC major research project no. 42/908/2013 (SR). One of the authors (S.De) wishes to thank to CSIR, India for providing JRF fellowship. We thank Dr. S. Giri and Dr. S. Majumdar for accessing their laboratory in Department of Physics, Indian Association for the Cultivation of Science, India. We are thankful to UGC-DAE CSR, Kolkata, India for providing X-ray diffraction measurement facility. We would also like to thank Dr. B. Sarkar, Bijoy Kumar Singha and Sunanda Chatterjee for their consistent inspiration during paper compilation.

Funders	Funder number
UGC-DAE	UDCSR/MUM/CD/CRS-M-254/2017/1024
Council of Scientific and Industrial Research, India
University Grants Committee	42/908/2013
University Grants Commission- Nepal

Keywords

Electrical transport
Magnetic property
Magnetoresistance
Manganites

Access to Document

10.1016/j.physb.2018.05.004

Cite this

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abstract = "We have investigated the effect of cation deficiency on the electric and magnetic properties of LaMnO3 in terms of both substitution of La by a divalent ion (Sr2+) and creating La-deficiency. The temperature and magnetic field dependence of electrical resistivity (ρ) and dc magnetization were studied. All the compounds are to be found in rhombohedral structure. The excess oxygen in all compounds was detected through iodometric titration. The metal to semiconducting transition and the paramagnetic to ferromagnetic transition is found to decrease with Mn4+ for all samples. The occurrence of magnetoresistance (MR) at low temperature and low field for La-deficient compounds is suggested due to the tunneling of electron through the grain boundary (GB). The nonlinear current-voltage (I–V) characteristic for La-deficient compounds indicates inelastic tunneling via localized states dominate the transport mechanism.",

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