Charge freezing in the zigzag chain PrBa2Cu4O8 cuprate.
Charge freezing in the zigzag chain PrBa2Cu4O8 cuprate.
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电荷冻结在锯齿状链 PrBa2Cu4O8 铜酸盐中。
DOI：
10.1103/physrevlett.90.147004
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发表时间：
2003
影响因子：
8.6
通讯作者：
S. Horii
中科院分区：
文献类型：
--
作者：
S. Fujiyama;M. Takigawa;S. Horii
我们报道了PrBa2Cu4O8的核四极共振（NQR）研究，这是一种准一维导体，具有近四分之一填充带。原子核自旋-晶格弛豫率1/T1在100k附近出现明显的峰值，这是由电场梯度波动引起的。在50 K附近的不同温度下，自旋回波衰减率1/T2出现了相似的峰值。这些结果和低温下NQR谱的展宽表明，电子源或离子源的慢电荷波动在低温下逐渐冻结。
We report nuclear quadrupole resonance (NQR) studies on the chain Cu sites of PrBa2Cu4O8, a quasi-one-dimensional conductor with a nearly quarter-filled band. The nuclear spin-lattice relaxation rate 1/T1 shows a pronounced peak near 100 K caused by fluctuations of electric field gradient. Similar peak was observed for the spin-echo decay rate 1/T2, however, at a different temperature near 50 K. These results and broadening of the NQR spectrum at low temperatures indicate that slow charge fluctuations of either electronic or ionic origin freeze gradually at low temperatures.