title: Anomalously large anisotropic magnetoresistance in a perovskite manganite.
abstract: The signature of correlated electron materials (CEMs) is the coupling between spin, charge, orbital and lattice resulting in exotic functionality. This complexity is directly responsible for their tunability. We demonstrate here that the broken symmetry, through cubic to orthorhombic distortion in the lattice structure in a prototype manganite single crystal, La(0.69)Ca(0.31)MnO(3), leads to an anisotropic magneto-elastic response to an external field, and consequently to remarkable magneto-transport behavior. An anomalous anisotropic magnetoresistance (AMR) effect occurs close to the metal-insulator transition (MIT) in the system, showing a direct correlation with the anisotropic field-tuned MIT in the system and can be understood by means of a simple phenomenological model. A small crystalline anisotropy stimulates a "colossal" AMR near the MIT phase boundary of the system, thus revealing the intimate interplay between magneto- and electronic-crystalline couplings.
authors.affiliation: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang 315201, People's Republic of China.
authors.forename: Run-Wei
authors.initials: RW
authors.lastname: Li
authors.forename: Huabing
authors.initials: H
authors.lastname: Wang
authors.forename: Xuewen
authors.initials: X
authors.lastname: Wang
authors.forename: X Z
authors.initials: XZ
authors.lastname: Yu
authors.forename: Y
authors.initials: Y
authors.lastname: Matsui
authors.forename: Zhao-Hua
authors.initials: ZH
authors.lastname: Cheng
authors.forename: Bao-Gen
authors.initials: BG
authors.lastname: Shen
authors.forename: E Ward
authors.initials: EW
authors.lastname: Plummer
authors.forename: Jiandi
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D016880:Anisotropy; D017610:Calcium Compounds / Q000737:chemistry*; D003198:Computer Simulation; D003460:Crystallization; D017097:Electric Impedance; D008280:Magnetics; D017895:Manganese Compounds / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D010087:Oxides / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D017610:Calcium Compounds; D017895:Manganese Compounds; D010087:Oxides; C494384:manganite; C059910:perovskite; D014025:Titanium
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