Crossover form dominant magnon drag to phonon drag in bismuth rich La0.85Na0.15MnO3manganite

Lozil Denzil Mendonca, Mamatha D. Daivajna

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The thermoelectric power (TEP) or seebeck coefficient (S) characteristic of bismuth substituted La0.85-xBixNa0.15MnO3 manganites (x = 0, 0.1, 0.2, 0.25, and 0.3) were studied to understand the effect of bismuth on influencing the conduction of charge carries in large bandwidth manganite La0.85Na0.15MnO3. A pragmatic equation S = S0 + S1T + S3/2T3/2 + S3T3 + S4T4 was exploited to obtain the contributions to thermopower at low temperature ferromagnetic state of the specimen. Both electrons and holes involve in conduction at different regime of temperature from 14K to 295K. A large increase of maximum TEP, Smax changing from 3 μV.K-1 to 67 μV.K-1 was realized at 30% substitution of Bi. This large increase in the TEP value is due to the appearance of phonon drag effect at low temperature in Bismuth rich La0.85Na0.15MnO3. The signature of both magnon drag and phonon drag is seen at low temperature. At high temperature small polarons are governing the conduction in the investigated specimen. Bismuth substitution in soft ferromagnetic manganites such as La0.85Na0.15MnO3 increases the activation energy thereby improving the TEP.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
EditorsAjay Kumar Mishra, Mohit Tyagi, D. V. Udupa, Sanjeeb Kumar Rout
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735447646
Publication statusPublished - 12-01-2024
Event66th DAE Solid State Physics Symposium, DAE-SSPS 2022 - Ranchi, India
Duration: 18-12-202222-12-2022

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference66th DAE Solid State Physics Symposium, DAE-SSPS 2022

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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