Doping-induced phase transitions in polycrystalline la 0.49Sr 0.51(Mn 1-xNb x)O 3

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

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Abstract

Observations of temperature dependences of ac susceptibility X ac, resistivity (ρ) and dc magnetization M for polycrystalline La 0.49Sr 0.51(Mn 1-xNb x)O 3 (x = 0, 0.05, 0.15, and 0.25) show that due to substitution of Mn 4+ by diamagnetic Nb 5+, there appear to be (i) the decrease of X ac as T > T N, (ii) the occurrence of a maximum (insulator-metal-like transition) for ρ near T C, (iii) the decline of M as x > 0.05, and (iv) the lowering of T C. The results might be ascribed to: (i) the rearrangement of Mn 3+ and Mn 4+ ions, (ii) the decrease of the number of Mn 3+ and Mn 4+ 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 Nb 5+ ions for Sr 2+ ions.

Original languageEnglish (US)
Pages (from-to)938-941
Number of pages4
JournalChinese Physics Letters
Volume22
Issue number4
DOIs
StatePublished - Apr 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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