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arXiv 0902.1382cond-mat.str-elcond-mat.supr-con
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铜氧化物中斜条纹的不可逆性和自旋激发

Incommensurability and spin excitations of diagonal stripes in cuprates

G. Seibold, J. Lorenzana

摘要:

基于含时Gutzwiller近似,我们研究了强欠掺杂铜酸镧中对角无公度自旋散射起源于反铁磁畴壁(条纹)的可能性。对对角相中条纹的动态自旋响应的计算产生了特征沙漏色散,其中低能Goldstone和高能分支在反铁磁波矢Q_{AF}的特征能量Ecross处交叉。高能量部分接近母体反铁磁体。我们的研究结果表明,强烈欠掺杂铜酸镧的非弹性中子散射实验可以被理解为由于大量的混乱的键中心和网站中心条纹配置的混合物。

英文摘要:

Based on the time-dependent Gutzwiller approximation we study the possibility that the diagonal incommensurate spin scattering in strongly underdoped lanthanum cuprates originates from antiferromagnetic domain walls (stripes). Calculation of the dynamic spin response for stripes in the diagonal phase yields the characteristic hour glass dispersion with the crossing of low energy Goldstone and high-energy branches at a characteristic energy Ecross at the antiferromagnetic wave-vector Q_{AF}. The high energy part is close to the parent antiferromagnet. Our results suggest that inelastic neutron scattering experiments on strongly underdoped lanthanum cuprates can be understood as due to a mixture of bond centered and site centered stripe configurations with substantial disorder.

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