Examining the oxygen isotope and magnetic field effect on phase separation in Sm0.5Sr0.5MnO3

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • A. N. Styka
  • Y. Ren
  • O. Yu Gorbenko
  • N. A. Babushkina
  • D. E. Brown

Detail(s)

Original languageEnglish
Article number103520
Journal / PublicationJournal of Applied Physics
Volume100
Issue number10
Publication statusPublished - 2006
Externally publishedYes

Abstract

Magnetic field (MF) dependence of the phase separation (PS) in the manganites Sm0.5 Sr0.5 MnO3 with O 16 and O 18 was studied using high-resolution high-energy x-ray powder diffraction in the temperature range from 4.2 to 240 K and with the MF up to 6 T. Although the two compounds have an identical structure [a paramagnetic (PM) phase with the Pbnm symmetry] at room temperature, they show a significant difference in the PS region below Tps ∼110 K, where the O 16 sample has a structural inhomogeneity in the form of two coexisting ferromagnetic (FM) and antiferromagnetic (AF) phases, while the O 18 -sample phase separates into mixed AF and PM phases. The O 16 → O 18 isotope substitution appears to prevent the formation of the FM phase at low temperature. The application of a magnetic field significantly enhances the FM phase by converting other phases, leading to a homogeneous structure. The effects on the microscopic structure of the oxygen isotope substitution and external magnetic field play the key role in the physics behind the colossal magnetoresistance effect. © 2006 American Institute of Physics.

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Citation Format(s)

Examining the oxygen isotope and magnetic field effect on phase separation in Sm0.5Sr0.5MnO3. / Styka, A. N.; Ren, Y.; Gorbenko, O. Yu et al.
In: Journal of Applied Physics, Vol. 100, No. 10, 103520, 2006.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review