Oxygen-isotope effect on the In-plane penetration depth in underdoped La2-xSrxCuO4 single crystals
Oxygen-isotope effect on the In-plane penetration depth in underdoped La2-xSrxCuO4 single crystals
复制标题
氧同位素对欠掺杂La2-xSrxCuO4单晶面内穿透深度的影响
DOI：
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发表时间：
1999
影响因子：
8.6
通讯作者：
K. Kishio
中科院分区：
文献类型：
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作者：
J. Hofer;K. Conder;Takao Sasagawa;Guo;M. Willemin;H. Keller;K. Kishio
本文报道了欠掺杂La_（2-x）Sr_xCuO_4单晶中氧同位素效应（OIE）对面内穿透深度λ（ab）（0）的测量。采用高灵敏度的磁转矩传感器，其分辨率为10（-12）Nm，用于质量约为10 g的微晶的磁测量。发现λ（-2）（ab）（0）的OIE对于x = 0.080为-10（2）%，对于x = 0.086为-8（1）%。它主要来自于面内有效质量m（*）（ab）的氧质量依赖性。这些结果表明晶格振动对高温超导性的发生是重要的。
We report measurements of the oxygen-isotope effect (OIE) on the in-plane penetration depth lambda(ab)(0) in underdoped La2-xSrxCuO4 single crystals. A highly sensitive magnetic torque sensor with a resolution of Deltatau approximately 10(-12) N m was used for the magnetic measurements on microcrystals with a mass of approximately 10 &mgr;g. The OIE on lambda(-2)(ab)(0) is found to be -10(2)% for x = 0.080 and -8(1)% for x = 0.086. It arises mainly from the oxygen-mass dependence of the in-plane effective mass m(*)(ab). The present results suggest that lattice vibrations are important for the occurrence of high temperature superconductivity.