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- W2294779847 abstract "The magnetic field and temperature dependence of the magnetic susceptibility and magnetization is studied for the ferromagnetic layered manganites SrO(La{sub t{minus}x}Sr{sub x}MnO{sub 3}){sub 2} in the composition range x = 0.32-0.40. In the paramagnetic phase, the susceptibility exhibits an anomalous maximum at an intermediate magnetic field value. The size of this field-induced susceptibility enhancement increases dramatically with x from 10% for x = 0.32 to 160% for x = 0.40. The temperature dependence of the effect shows a maximum at T {approx} 1.1 T{sub c} for all x. Quantitative analysis in terms of the Landau theory of phase transitions enables us to identify a distortion of the free energy F in the paramagnetic phase that is associated with the susceptibility anomaly. This free energy distortion corresponds to a magnetic system that approaches a first order magnetic phase transition as the temperature is lowered towards T{sub c}. Such a behavior is indicative of a second, competing order parameter, which is identified as the recently observed charge density wave. In the immediate vicinity of T{sub c}, the anomaly disappears and the system seems to undergo a more conventional second order paramagnetic-ferromagnetic phase transition." @default.
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- W2294779847 date "2000-11-08" @default.
- W2294779847 modified "2023-09-28" @default.
- W2294779847 title "Evidence for competing order parameters in the paramagnetic phase of layered manganites." @default.
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