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arXiv 1609.02162cond-mat.supr-concond-mat.str-el
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La $_{1.875}$ Ba $_{0.125}$ CuO $_4$中电荷和自旋条纹有序的Cu核磁共振研究

Cu nuclear magnetic resonance study of charge and spin stripe order in La$_{1.875}$Ba$_{0.125}$CuO$_4$

Damjan Pelc, Hans-Joachim Grafe, Genda D. Gu, Miroslav Požek

摘要:

我们提出了一个铜的核磁/四极共振研究的电荷条纹有序相LBCO,与检测以前未观察到的(“擦除”)信号。我们发现,自旋-自旋和自旋-晶格弛豫速率在电荷有序相强烈增强,解释了早期调查中明显的信号下降。这种增强是由磁场而不是电荷波动引起的,最终证实了长期以来怀疑的自旋波动是造成擦除效应的假设。完整的铜信号的观察,使洞察到的条纹有序相的自旋和电荷动力学,并在外部磁场的测量提供的信息的性质和抑制自旋波动与电荷顺序。我们发现玻璃自旋动力学,与以前的工作,和不相称的静电荷秩序与其他铜酸盐化合物的电荷调制幅度相似,这表明电荷条纹的幅度是普遍的铜酸盐。

英文摘要:

We present a Cu nuclear magnetic/quadrupole resonance study of the charge stripe ordered phase of LBCO, with detection of previously unobserved ('wiped-out') signal. We show that spin-spin and spin-lattice relaxation rates are strongly enhanced in the charge ordered phase, explaining the apparent signal decrease in earlier investigations. The enhancement is caused by magnetic, rather than charge fluctuations, conclusively confirming the long-suspected assumption that spin fluctuations are responsible for the wipeout effect. Observation of the full Cu signal enables insight into the spin and charge dynamics of the stripe-ordered phase, and measurements in external magnetic fields provide information on the nature and suppression of spin fluctuations associated with charge order. We find glassy spin dynamics, in agreement with previous work, and incommensurate static charge order with charge modulation amplitude similar to other cuprate compounds, suggesting that the amplitude of charge stripes is universal in the cuprates.

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