La(1 - x)Ca(x)MnO3中轨道序诱导的金属 - 绝缘体转变
Orbital-order-induced metal-insulator transition in La(1-x)Ca(x)MnO3.
作者信息
Van Aken Bas B, Jurchescu Oana D, Meetsma Auke, Tomioka Y, Tokura Y, Palstra Thomas T M
机构信息
Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
出版信息
Phys Rev Lett. 2003 Feb 14;90(6):066403. doi: 10.1103/PhysRevLett.90.066403.
We present evidence that the insulator-to-metal transition in La(1-x)Ca(x)MnO3 near x approximately 0.2 is driven by the suppression of coherent Jahn-Teller distortions, originating from d-type orbital ordering. The orbital-ordered state is characterized by large long-range Q2 distortions below T(O'- O*). Above T(O'- O*) we find evidence for coexistence between an orbital-ordered and an orbital-disordered state. This behavior is discussed in terms of electronic phase separation in an orbital-ordered insulating and an orbital-disordered metallic state.
我们给出证据表明，在x约为0.2附近的La(1-x)Ca(x)MnO3中，绝缘体到金属的转变是由源于d型轨道有序化的相干 Jahn-Teller 畸变的抑制所驱动的。轨道有序态的特征是在T(O'- O*)以下存在大的长程Q2畸变。在T(O'- O*)以上，我们发现了轨道有序态和轨道无序态共存的证据。这种行为是根据轨道有序绝缘态和轨道无序金属态中的电子相分离来讨论的。
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