WEAK PSEUDOGAP BEHAVIOR IN THE UNDERDOPED CUPRATE SUPERCONDUCTORS
WEAK PSEUDOGAP BEHAVIOR IN THE UNDERDOPED CUPRATE SUPERCONDUCTORS
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DOI：
10.1103/physrevlett.80.3839
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发表时间：
1997-08
影响因子：
4
通讯作者：
J. Schmalian;D. Pines;B. Stojković
中科院分区：
文献类型：
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作者：
J. Schmalian;D. Pines;B. Stojković
摘要本文报道了近反铁磁费米液体自旋费米子模型在极限π T比ω sf下的精确解，证明了在ARPES测量中发现的欠掺杂超导体谱密度的广泛高能量特征是由强反铁磁（AF）相关和SDW态的前驱效应决定的。我们证明了弱赝隙（伪标度）行为的起始温度tcr是由AF相关的强度ξ决定的，并且用ξ(tcr)≈2得到了核磁共振实验中低频磁性行为的一般变化，证实了Barzykin和Pines交叉准则。
Abstract We report on an exact solution of the nearly antiferromagnetic Fermi liquid spin fermion model in the limit π T ≫ω sf , which demonstrates that the broad high energy features found in ARPES measurements of the spectral density of the underdoped superconductors are determined by strong antiferromagnetic (AF) correlations and precursor effects of an SDW state. We show that the onset temperature, T cr , of weak pseudogap (pseudoscaling) behavior is determined by the strength, ξ, of the AF correlations, and obtain with ξ( T cr )≈2 the generic changes in low frequency magnetic behavior seen in NMR experiments, confirming the Barzykin and Pines crossover criterion.