Correlation between the Doping Dependences of Superconducting Gap Magnitude 2Δ 0 and Pseudogap Temperature T* in High-T c Cuprates
Correlation between the Doping Dependences of Superconducting Gap Magnitude 2Δ 0 and Pseudogap Temperature T* in High-T c Cuprates
复制标题
高温 c 铜氧化物中超导能隙大小 2Δ 0 与赝能隙温度 T* 的掺杂依赖性之间的相关性
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Ido
中科院分区：
文献类型：
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作者：
T. Nakano;N. Momono;M. Oda;M. Ido
在La 2-xSrxCuO 4（La 2 14）和Bi 2 Sr 2 CaCu 2 O 8+δ（Bi 2 2 12）中，电阻率ρ和磁化率χ在T * 以下急剧下降，至少对于Bi 2 2 12，T * 对应于自旋能隙（赝能隙）的起始温度.在每个系统中，T * 与超导能隙大小2Δ 0（T * 2Δ 0 /4.3 k B）成比例，其随着掺杂水平的降低而增加。2Δ 0几乎与Tmax（> T *）成正比，其中Tmax是出现χ宽峰的温度，k B Tmax被认为是有效交换能J eff的度量; 2Δ 0 <$α k B Tmax <$α J eff中的α因子对于La 214和Bi 2212分别接近1和2。
We report that in La 2- x Sr x CuO 4 (La214) and Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212), the resistivity ρ and magnetic susceptibility χ decrease more sharply below T * , corresponding to the onset temperature of a spin gap (pseudogap) at least for Bi2212. In each system, T * scales with the superconducting gap magnitude 2Δ 0 ( T * ∼2Δ 0 /4.3 k B ), which increases as the doping level is lowered. We also report that 2Δ 0 is almost proportional to T max (> T * ), where T max is the temperature exhibiting a broad peak of χ and k B T max has been considered to give the measure of effective exchange energy J eff ; the α factors in 2Δ 0 ∼α k B T max ∼α J eff are nearly one and two for La214 and Bi2212, respectively.