Oxygen isotope effect on the effective mass of carriers from magnetic measurements on La2-xSrxCuO4.
Oxygen isotope effect on the effective mass of carriers from magnetic measurements on La2-xSrxCuO4.
复制标题
La2-xSrxCuO4 磁性测量中氧同位素对载流子有效质量的影响。
DOI：
10.1103/physrevb.52.6840
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Morris
中科院分区：
文献类型：
--
作者：
Zhao;M. S. Singh;Sinha;Morris
在{ital x}=0.105、0.110和0.115的细晶解耦La{sub - 2{-}{ital x}}Sr{sub - {ital x}}CuO{sub 4}中研究了氧同位素对{ital T}{sub - {ital c}}和Meissner分数{ital f}的影响。我们发现这些氧同位素效应是相互关联的：{ital d} ln{ital T}{下标{ital c}}/{ital d} ln{ital M}{约}{ital d} ln{ital f}/{ital d} ln{ital M}（其中{ital M}为氧的质量）。我们还发现，在我们的样品中，由于粒间弱链和粒内钉住引起的捕获通量可以忽略不计，并且具有相同{sup 16}O同位素的样品的迈斯纳分数几乎相等。观察到的大氧同位素对{ital T}{sub {ital c}}和迈斯纳分数的影响可以解释为由于{ital m}{sup *}（载流子的有效质量）的氧质量依赖。结果表明，铜超导体中的导电载流子属于极化型。
Oxygen isotope effects on {ital T}{sub {ital c}} and the Meissner fraction {ital f} have been investigated in fine-grained, decoupled La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4} with {ital x}=0.105, 0.110, and 0.115. We find that these oxygen isotope effects are related to each other: {ital d} ln{ital T}{sub {ital c}}/{ital d} ln{ital M}{approx}{ital d} ln{ital f}/{ital d} ln{ital M} (where {ital M} is the mass of oxygen). We also show that the trapped flux due to intergrain weak-link and intragrain flux pinning is negligible in our samples, and that the Meissner fractions for the samples with the same {sup 16}O isotope are nearly equal The observed large oxygen isotope effects on {ital T}{sub {ital c}} and the Meissner fraction can be explained as due to the oxygen-mass dependence of {ital m}{sup *} (effective mass of carriers). The results may suggest that the conducting carriers in the cuprate superconductors are of polaronic type.