Electron spin resonance above Tc in layered manganites

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.63.174413
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume63
Issue17
Pages174413–; # of pages: 1
AbstractWe have performed electron spin resonance (ESR) and dc magnetization measurements on single crystals of La2(1-x)Sr1+2xMn2O7 up to 800 K with special emphasis on the x=0.4 composition. The ESR linewidth shows behavior similar to that observed in the three-dimensional perovskites and above ?500 K can be described by a universal expression ?Hpp(T)=[C/T?(T)]?Hpp(?). The linewidth and the resonance field become anisotropic below ?500 K. The anisotropy in the resonance field is proportional to the magnetization M, and we concluded that it is intrinsic to the system. We show that demagnetization effects can explain only part of the anisotropy. The remainder arises from short-range uniaxial terms in the Hamiltonian that are associated with the crystal field and Dzialozhinsky-Moriya interactions. The anisotropy in the linewidth is attributed to the easy-plane ferromagnetic ordering, which also arises from the short-range anisotropy.
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LanguageEnglish
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NPARC number12327737
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Record identifierb85daa13-6c42-4ca4-94e5-babda0709e03
Record created2009-09-10
Record modified2016-05-09
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