聚合物
材料科学
凝聚态物理
散射
电子
电导率
自旋极化
导电聚合物
共轭体系
电子转移
自旋(空气动力学)
化学物理
化学
复合材料
光学
物理化学
物理
热力学
量子力学
作者
Feng Luo,Wei Song,Zhe‐Ming Wang,Chun‐Hua Yan
摘要
A series of polyparaphenyl derivatives with different conductivities have been synthesized to fabricate three kinds of polymer-embedded La0.7Ca0.3MnO3 (LCMO) composites by mixing different weight fractions of polymers and LCMO. X-ray diffraction and Fourier transform infrared spectra show the coexistence of the LCMO particles and polymers and no chemical reactions between each other. By adjusting the conductivity and π electron polarization of polymers, spin-polarized electron transfer from the surfaces of LCMO magnetic particles through the interfacial coupling into polymers can be tuned, leading to the tunable negative and positive magnetoresistances in these composites. This abnormal positive MR can be mainly attributed to the spin-polarized electron tunneling weakening and magnetic scattering enhancement on polarized π electrons through the LCMO/polymer interfaces.
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