轻掺杂反铁磁有序YBa2Cu3O {6+y}的ARPES谱函数
ARPES Spectral Function in Lightly Doped and Antiferromagnetically Ordered YBa2Cu3O{6+y}
摘要：
当掺杂量低于6%时，YBa_2Cu_3O {6+y}为共线反铁磁体。不考虑掺杂，零温交错磁化强度约为0.6μ B.这是局域自旋的量子涨落所允许的磁化强度的最大值。在这种低掺杂状态下，化合物是在零温度下具有有限电阻率的正常导体。这些实验观测为理论执行电子光谱函数的受控计算创造了独特的机会。在目前的工作中，我们进行此计算的扩展t-J模型的框架内。正如人们所预期的那样，费米表面由中心位于（π/2，π/2）的小孔口袋组成。电子谱函数具有很强的各向异性，最大强度位于袋的内部，而在袋的外部具有很小的强度。我们还发现反铁磁关联作用于双层膜的键-反键劈裂，破坏了它，双层膜的费米面劈裂几乎为零。
英文摘要：
At doping below 6% the bilayer cuprate YBa2Cu3O{6+y} is a collinear antiferromagnet. Independent of doping the value of the staggered magnetization at zero temperature is about 0.6μ_B. This is the maximum value of the magnetization allowed by quantum fluctuations of localized spins. In this low doping regime the compound is a normal conductor with a finite resistivity at zero temperature. These experimental observations create a unique opportunity for theory to perform a controlled calculation of the electron spectral function. In the present work we perform this calculation within the framework of the extended t-J model. As one expects the Fermi surface consists of small hole pockets centered at (π/2,π/2). The electron spectral function is very strongly anisotropic with maximum of intensity located at the inner parts of the pockets and with very small intensity at the outer parts. We also found that the antiferromagnetic correlations act against the bilayer bonding-antibonding splitting destroying it. The bilayer Fermi surface splitting is practically zero.
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