Adiabatic and non-adiabatic hopping conduction in La-Pb-Mn-O type system

A. Banerjee, S. Pal, E. Rozenberg, B. K. Chaudhuri

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Magnetic field dependent resistivity (ρ) and Seebeck coefficient (S) of La1-xPbxMnO3 (x=0.0-0.5), prepared by sol-gel method, have been reported. One set (LaMnO3+δ) sample, termed as LCON, was found to show insulator (semiconductor) to metal transition (MIT) around Tp∼265 K and the other set (LaMnO3), termed as LSEM, did not show such transition. Tp shifts to the lower temperature under magnetic field. It has been shown, for the first time, that both in presence or in absence of magnetic field, two different transport mechanisms (adiabatic and non-adiabatic) are followed, respectively, by LSEM and LCON (for T>Tp). Like resistivity, S of the sample was also found to depend on the applied magnetic field particularly around Tp. The samples showing no MIT indicated larger Debye temperatures and electron-phonon interaction constants (γp) than those of the sample showing MIT. Both ρ and S of La1-xPbxMnO3 (x=0.0-0.5) behave similarly to those of LCON.

Original languageEnglish
Pages (from-to)85-88
Number of pages4
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - 9 Aug 2001
EventProceedings of the International on Magnetic Materials - Calcutta, India
Duration: 17 Oct 200019 Oct 2000


  • Giant magnetoresistance
  • Hopping conduction
  • Sol-gel

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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