Doping-induced phase transitions in polycrystalline la 0.49Sr0.51(Mn1-xNbx)O3

Wen Jun Liu, Qi Qing Shu, Xiao Cui Ma, S. M. Bhagat, S. E. Lofland, I. O. Troyanchuk

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Observations of temperature dependences of ac susceptibility X ac, resistivity (ρ) and dc magnetization M for polycrystalline La0.49Sr0.51(Mn1-xNbx)O3 (x = 0, 0.05, 0.15, and 0.25) show that due to substitution of Mn4+ by diamagnetic Nb5+, there appear to be (i) the decrease of X ac as T > TN, (ii) the occurrence of a maximum (insulator-metal-like transition) for ρ near TC, (iii) the decline of M as x > 0.05, and (iv) the lowering of TC. The results might be ascribed to: (i) the rearrangement of Mn3+ and Mn 4+ ions, (ii) the decrease of the number of Mn3+ and Mn4+ pairs involved in double exchange interaction, (iii) the delocalization of the electrons and holes, (iv) the reduction of the randomness of the delocalized carrier scattering by thermal spin fluctuation due to magnetic ordering, and (v) the compensation effect of Nb5+ ions for Sr2+ ions.

Original languageEnglish (US)
Pages (from-to)938-941
Number of pages4
JournalChinese Physics Letters
Issue number4
StatePublished - Apr 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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