ENERGY GAPS AND PHONON STRUCTURES IN TUNNELING SPECTRA OF BI2SR2CA1CU2O8+X AND BI2SR2CA2CU3O10+Y SUPERCONDUCTORS

被引：18

作者：

KOLTUN, R ^{[1
]}

HOFFMANN, M ^{[1
]}

SPLITTGERBERHUNNEKES, PC ^{[1
]}

GUNTHERODT, G ^{[1
]}

MOSHCHALKOV, VV ^{[1
]}

LEONYUK, LI ^{[1
]}

机构：

[1] MOSCOW MV LOMONOSOV STATE UNIV,DEPT PHYS,HIGH TEMPERATURE SUPERCONDUCT LAB,MOSCOW 117234,RUSSIA

来源：

PHYSICA B | 1990年 / 165卷

关键词：

D O I：

10.1016/S0921-4526(09)80369-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Polycrystalline Bi-2212 or Bi-2223 systems and single crystals of the Bi-2212 system were investigated at several temperatures by means of the break-junction and point-contact tunneling techniques, respectively. The measured averaged gap values are 2Δ=65±4 meV in the Bi-2223 and 2Δ=45±5 meV in the Bi-2212 systems, with 2Δ/kBTc =7.3 and 6.8, respectively. A dc-Josephson-type supercurrent could be observed in polycrystalline Bi-2212 samples in addition to the usual gap structure. The point-contact tunneling spectra of Bi-2212 single crystals exhibit structures in the second derivative d2I/dV2 which we interpret as inelastic tunneling processes due to electron-phonon scattering in the barrier region. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.

引用

页码：1567 / 1568

页数：2