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- W1984640495 abstract "The complex charge ordering phenomena for polycrystalline La1−xSrxFeO3 (1/3≤x≤2/3) have been studied by measuring the low temperature magnetization, resistivity and the longitudinal ultrasonic velocity (Vl). At low doping levels (1/3≤x≤0.5), a dramatic velocity increase is observed below 210 K, and the relative stiffening of Vl is proportional to the Sr concentration. The analysis suggests that this feature may correspond to the short-range charge ordering state of Fe3+ and Fe4+. At high doping levels (0.5<x≤2/3), the resistivity shows a sharp increase around 200 K, and the relative stiffening of Vl decreases with increasing x. This implies that the charge disproportionation transition occurs. In particular, the Vl of La1/3Sr2/3FeO3 undergoes another softening transition below 181 K, which is attributed to the breathing-type distortion of Fe–O octahedron in the sequence...Fe3+Fe5+Fe3+.... The detailed form of the sound velocity anomalies in La1−xSrxFeO3 (x = 1/3,2/3) is different, revealing the presence of complex charge ordering phenomena. To complete the ultrasonic characterization in La1−xSrxFeO3, sound measurements were performed on La0.1Sr0.9FeO3, whose ground state is a typical antiferromagnetic order, and the anomaly is small." @default.
- W1984640495 created "2016-06-24" @default.
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- W1984640495 date "2008-02-20" @default.
- W1984640495 modified "2023-10-16" @default.
- W1984640495 title "An ultrasonic study on complex charge ordering phenomena for La<sub>1−<i>x</i></sub>Sr<sub><i>x</i></sub>FeO<sub>3</sub>" @default.
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- W1984640495 doi "https://doi.org/10.1088/0953-8984/20/11/115211" @default.
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