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Charge inhomogeneities in the colossal magnetoresistant manganites from the local atomic structure

机译：来自局部原子结构的巨磁阻锰中的电荷不均匀

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We have measured atomic pair distribution functions (PDF) of La{sub}(1-x)Ca{sub}xMnO{sub}3 using high energy x-ray diffraction. This approach yields accurate PDFs with very high real-space resolution. It also avoids potential pitfalls from the more usual neutron measurements that magnetic scattering is present in the measurement, that the neutron scattering length of manganese is negative leading to partial cancellation of PDF peaks, and that inelasticity effects might distort the resulting PDF. We have used this to address the following questions which do not have a satisfactory answer: (1) What are the amplitudes and natures of the local Jahn-Teller and polaronic distortions in the CMR region. (2) Is the ground-state of the ferromagnetic metallic phase delocalized or polaronic. (3) As one moves away from the ground-state, by raising temperature or decreasing doping, towards the metal insulator transition, how does the state of the material evolve?
机译：我们使用高能X射线衍射测量了LA {Sub}（1-x）CA {Sub} {Sub} {Sub} 3的原子对分布函数（PDF）。这种方法产生精确的PDF，具有非常高的真实空间分辨率。它还避免了从更常见的中子测量结果中避免潜在的缺陷，即在测量中存在磁散射，锰的中子散射长度是负导致PDF峰的部分消除，并且内部效应可能扭曲所得的PDF。我们已经使用它来解决以下问题，这些问题没有满意的答案：（1）CMR区域中当地jahn-externer和极性扭曲的幅度和自然是什么。 （2）是铁磁金属相移层或极性的地位。 （3）随着一个远离地面状态，通过升温或掺杂掺杂，朝金属绝缘体转变，材料的状态如何发展？

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