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首页> 外文期刊>Solid State Communications >Positive magnetoresistance feature in ultrathin La_(0.67)Ca_(0.33)MnO_3 films
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Positive magnetoresistance feature in ultrathin La_(0.67)Ca_(0.33)MnO_3 films

机译：La_（0.67）Ca_（0.33）MnO_3超薄膜的正磁阻特性

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摘要

The ultrathin epitaxial La_(0.67)Ca_(0.33)MnO_3 (LCMO) films with thickness from 8 to 50 nm on (001) SrTiO_3 (STO) substrates were prepared and investigated, and the unique MR effects were distinctly observed. The positive magnetoresistance (MR) effects were observed in the high temperature region for all the present ultrathin films. The films with thickness in the range from 17 to 30 nm not only show the positive MR effect at high temperature (>T_(MI )), but also in the low temperature region ( ≤ 96 K for 17 nm, ≤ 108 K for 30 nm). It is suggested that the positive MR effect occurred at low temperature could be attributed to the scattering of the domain wall on charge carriers, while the positive MR effect occurred at temperature higher than T_(MI) is attributed to the transport dominated by the magnetic polarons which formed due to the trap of charge carriers with spin in local distorted lattice in such highly strained ultrathin LCMO films.
机译：制备并研究了在（001）SrTiO_3（STO）衬底上厚度为8至50 nm的超薄外延La_（0.67）Ca_（0.33）MnO_3（LCMO）膜，并观察到了独特的MR效应。对于所有当前的超薄膜，在高温区域均观察到正磁阻（MR）效应。厚度在17至30 nm范围内的薄膜不仅在高温（> T_（MI））上显示出正MR效应，而且在低温区​​域（17 nm≤96 K，30≤108 K）也显示出正的MR效应。纳米）。建议低温下发生的正MR效应可归因于畴壁在电荷载流子上的散射，而温度高于T_（MI）时发生的正MR效应可归因于磁极化子占主导地位的传输。这是由于在这种高度应变的超薄LCMO薄膜中，电荷载流子被捕获在局部扭曲的晶格中而形成的。

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