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首页> 外文会议>Symposium on Science and Technology of Magnetic Oxides December 1-4, 1997, Boston, Massachusetts, U.S.A. >Magnetoransport in thin films of La_(n-nx)Ca_(1+nx)MnO_(3n+1) (n chemical bounds 2, 3, and infinity)
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Magnetoransport in thin films of La_(n-nx)Ca_(1+nx)MnO_(3n+1) (n chemical bounds 2, 3, and infinity)

机译：La_（n-nx）Ca_（1 + nx）MnO_（3n + 1）（n个化学界2、3和无穷大）薄膜中的磁运动

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摘要

with a use of the epitaxial a-axis thin films of perovskite series La_(n-nx)Ca_(1+nx)MnO_(3n+1) (n chemical bounds 2, 3, and infinity) with fixed carrier concentration (x chemical bounds 0.3), the transport properties of the series compounds have been examined to be associated with the difference in the number of the MnO_2 layers. Results have indicated that a reduction in the number of layers results in systematic changes in the various features. these include an increase in resistivity, a decrease in resistivity peak temperature T_c~ rho corresponding to the metal-insulator transition, an enhancement of the maximum MR near T_c~ rho , and an increase in low temperature intrinsic MR. In order to explain the variation in these features with the number of MnO_2 lqayers, it is necessary to take both anisotropic c-axis transfer interaction and two-dimensional spin fluctuaton into account.
机译：使用钙钛矿系列La_（n-nx）Ca_（1 + nx）MnO_（3n + 1）（n个化学界2、3和无穷大）的钙钛矿系列外延a轴薄膜，且载流子浓度固定（x边界0.3），已检查了系列化合物的传输性能与MnO_2层数的差异有关。结果表明，层数的减少导致各种特征的系统变化。这些包括电阻率的增加，对应于金属-绝缘体转变的电阻率峰值温度T_c_rho的降低，T_c_rho附近的最大MR的提高以及低温固有MR的提高。为了解释这些特征随MnO_2数量的变化，必须同时考虑各向异性的c轴传递相互作用和二维自旋涨落。

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