DETERMINATION OF THE ENERGY-GAP IN YBA2CU3O7-DELTA BY TUNNELING, FAR INFRARED REFLECTION AND ANDREEV REFLECTION

被引：35

作者：

VANBENTUM, PJM

HOEVERS, HFC

VANKEMPEN, H

VANDELEEMPUT, LEC

DENIVELLE, MJMF

SCHREURS, LWM

SMOKERS, RTM

TEUNISSEN, PAA

机构：

[1] Univ of Nijmegen, Netherlands

来源：

PHYSICA C | 1988年 / 153卷 / 02期

关键词：

Electron Tunneling - Energy Gap Determination - Far Infrared Reflection - Yttrium Barium Copper oxide;

D O I：

10.1016/0921-4534(88)90460-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The energy gap of bulk and thin film YBa2Cu3O7-7 has been studied with three independent techniques: Quasiparticle Tunneling in a low temperature scanning tunneling microscope, Andrew Reflection at a normal/superconductor interface and Far Infrared Reflection measurements. The tunneling results are consistent with a BCS density of states for the quasiparticles. In addition, the observation of Andreev Reflection is a clear indication for a zero-momentum (k,-k) pairing. The results yield an average gap-Tc ratio 2Δ/kBTc=3.6±0.6, close to the week-coupling BCS prediction. We discuss the observation of single electron tunneling in small capacitance tunnel junctions on YBa2Cu3O7-δ and of the incremental charging effect on isolated small particles on these materials.

引用

页码：1718 / 1723

页数：6

共 49 条

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