Raman study of YBa2Cu3O7-x single crystals grown by a pulling technique: Overdoped, underdoped, and nonsuperconducting state.
Raman study of YBa2Cu3O7-x single crystals grown by a pulling technique: Overdoped, underdoped, and nonsuperconducting state.
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通过提拉技术生长的 YBa2Cu3O7-x 单晶的拉曼研究：过掺杂、欠掺杂和非超导状态。
DOI：
10.1103/physrevb.51.1346
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Tanaka
中科院分区：
文献类型：
--
作者：
Misochko;Tajima;Miyamoto;Kobayashi;Kagiya;Watanabe;Koshizuka;Tanaka
我们测量了三个YBa 2 Cu 3 O 7−x单晶在高掺杂水平（x→0）、中掺杂水平（x 0.5）和低掺杂水平（x 0.15）下的拉曼散射。在x→0时，发现了完全对称对角声子和非对角声子，但没有任何无序诱导模式，而在其他两种晶体中，只有对角散射表现出可观的强度。在室温下，当x→0时，顶端氧声子的高频达到517 cm−1，这是通过牵引技术生长的晶体的标志。
We have measured the Raman scattering from three single crystals of YBa 2 Cu 3 O 7− x at high, x→ 0, intermediate, x≊ 0.5, and low doping level, x≊ 0.15. Both fully symmetrical diagonal and off-diagonal phonons without any disorder induced modes have been identified for x→ 0, whereas only diagonal scattering showed substantial strength in the other two crystals. The high frequency of the apical oxygen phonon, reaching 517 cm− 1 at room temperature for x→ 0, has been found to be a hallmark of the crystals grown by a pulling technique.