Evolution of interlayer tunneling spectra and superfluid density with doping in Bi2Sr2CaCu2O8+δ

被引：23

作者：

Suzuki, Minoru ^{[1
,2
]}

Hamatani, Takashi ^{[1
]}

Anagawa, Kenkichi ^{[1
]}

Watanabe, Takao ^{[3
]}

机构：

[1] Kyoto Univ, Dept Elect Sci & Engn, Kyoto 6158510, Japan

[2] Kyoto Univ, Photon & Elect Sci & Engn Ctr, Kyoto 6158510, Japan

[3] Hirosaki Univ, Dept Adv Phys, Aomori 0368561, Japan

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 21期

关键词：

HIGH-TEMPERATURE SUPERCONDUCTORS; INTRINSIC JOSEPHSON-JUNCTIONS; T-C SUPERCONDUCTORS; PENETRATION-DEPTH MEASUREMENTS; NORMAL-STATE PROPERTIES; MUON SPIN ROTATION; GRAIN-BOUNDARIES; SINGLE-CRYSTALS; OVERDOPED BI2SR2CACU2O8+DELTA; CUPRATE SUPERCONDUCTORS;

D O I：

10.1103/PhysRevB.85.214529

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Interlayer tunneling spectra, the Josephson critical current density J(c), and the normal tunneling resistance have been measured simultaneously for intrinsic Josephson junctions in Bi2Sr2CaCu2O8+delta over a wide range of doping using a small mesa structure and a short-pulse technique. It is found that J(c) decreases by nearly two orders of magnitude in the underdoped region. Experimental J(c) is found to show a significant deviation from the theoretical estimates. In order to interpret the result, we propose a model in which the superconducting order parameter is inhomogeneous in k space rather than in real space. Based on this model, quasiparticle current-voltage characteristics are calculated, giving a qualitative agreement with the experiment.

引用

页数：10

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