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- W2317506713 abstract "Magnetic ion spin dynamics has been investigated in the perovskite manganite ${mathrm{Nd}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}{mathrm{MnO}}_{3}$ single crystals at the hole concentrations x of 0.5 and 0.55 by muon spin relaxation $({ensuremath{mu}}^{+}mathrm{SR})$ spectroscopy. We have observed the critical slowing down of Mn ion spin fluctuations on approaching the ferromagnetic ordering at $ensuremath{sim}251mathrm{K}$ in ${mathrm{Nd}}_{0.5}{mathrm{Sr}}_{0.5}{mathrm{MnO}}_{3}.$ The critical paramagnetic spin fluctuations, measured by the muon spin relaxation rate ${ensuremath{lambda}}_{1},$ exhibit a crossover behavior from exchange critical regime to dipolar critical regime. This crossover is explained by considering the suppression of longitudinal and transverse components of spin susceptibility by dipolar interactions closer to ${T}_{C}$ and the dipolar vector ${q}_{D}$ is found to be $0.020(2){mathrm{AA{}}mathrm{}}^{ensuremath{-}1}.$ The dynamic critical exponent $z=2.00(12),$ deduced from muon spin relaxation rates away from ${T}_{C}$ (nonasymptotic regime), agrees with the experimental and the theoretical results of $3d$ dipolar ferromagnets. Critical slowing down is not observed in the $x=0.55$ crystal at the onset of antiferromagnetic ordering at $ensuremath{sim}220mathrm{K}.$ Muon spin relaxation in the $x=0.5$ crystal (above ${T}_{N}ensuremath{approx}160mathrm{K})$ and in the $x=0.55$ crystal (both above and below ${T}_{N})$ is root exponential and indicates nondiffusive relaxation mechanism as is in a magnetic glass. The growth of a glasslike relaxation component concomitant with the magnetic ordering has been observed in both the crystals. We suggest that this glassy component originates from those Mn ions located in local regions containing small and differently sized spin clusters." @default.
- W2317506713 created "2016-06-24" @default.
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- W2317506713 date "2000-02-01" @default.
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- W2317506713 title "Critical spin dynamics in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi>−</mml:mi><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>MnO</mml:mi></mml:…" @default.
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- W2317506713 doi "https://doi.org/10.1103/physrevb.61.4060" @default.
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