Abstract
The structural study of Sr 0.9Ce 0.1Mn 1– y Cr y O 3 ( y = 0 , 0.05, and 0.10) has been carried out by X-ray diffraction. For undoped sample Sr 0.9Ce 0.1MnO 3, it undergoes a first-order structural transition accompanied by Jahn–Teller (JT) transition at T JT = 320 K . The JT transition temperature is reduced in Cr-doped samples, becoming T JT = 260 K for y = 0.10 . The tetragonal I 4 / m c m structure is characterized by the JT distortion in MnO 6 octahedra with the distortion mode Q 3 . With increasing Cr doping content, the deformation of MnO 6 octahedra is weakened, showing that Cr doping destabilizes the JT effect. In addition, elastic properties measurement indicates that a large softening of Young's modulus occurs in the vicinity of T JT , which has been interpreted in terms of the strong electron–phonon coupling originating from the JT effect.
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