TRANSITION FROM THE TUNNELING REGIME TO POINT CONTACT AND PROXIMITY-INDUCED JOSEPHSON EFFECT IN LEAD NORMAL-METAL NANOJUNCTIONS

被引：36

作者：

AGRAIT, N

RODRIGO, JG

VIEIRA, S

机构：

[1] Laboratorio de Bajas Temperaturas, Departamento de Fisica de la Materia Condensada, Universidad Autonoma de Madrid

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.46.5814

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the transition from the tunneling regime to point contact with a low-temperature scanning tunneling microscope, when one of the electrodes is a normal metal (Au, Pt-Rh) and the other is a superconductor (Pb). Continuous variation of the junction resistance, spanning more than six orders of magnitude, results in the observation of the superconducting gap, Andreev reflection, and for low resistance, a zero-bias sharp peak. Detailed study of the conductance curves and comparison with results for junctions composed of two superconducting electrodes support the interpretation of this feature as a second-order proximity-induced Josephson effect (PJE).

引用

页码：5814 / 5817

页数：4

共 21 条

[1] VERTICAL INERTIAL PIEZOELECTRIC TRANSLATION DEVICE FOR A SCANNING TUNNELING MICROSCOPE [J].

AGRAIT, N .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1992, 63 (01) :263-264

[2] SPATIALLY RESOLVED LOW-TEMPERATURE SPECTROSCOPY ON NIOBIUM BULK SAMPLES [J].

BERTHE, R ;

HARTMANN, U ;

HEIDEN, C .

JOURNAL OF MICROSCOPY-OXFORD, 1988, 152 :831-839

[3] METALLIC TO TUNNELING TRANSITION IN CU-NB POINT CONTACTS [J].

BLONDER, GE ;

TINKHAM, M .

PHYSICAL REVIEW B, 1983, 27 (01) :112-118

[4] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[5] SPATIAL VARIATIONS IN THE SUPERCONDUCTIVITY OF NB3SN MEASURED BY LOW-TEMPERATURE TUNNELING MICROSCOPY [J].

DELOZANNE, AL ;

ELROD, SA ;

QUATE, CF .

PHYSICAL REVIEW LETTERS, 1985, 54 (22) :2433-2436

[6] POINT-CONTACT SPECTROSCOPY [J].

DUIF, AM ;

JANSEN, AGM ;

WYDER, P .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1989, 1 (20) :3157-3189

[7] CONTACT RESISTANCE IN THE SCANNING TUNNELING MICROSCOPE AT VERY SMALL DISTANCES [J].

FERRER, J ;

MARTINRODERO, A ;

FLORES, F .

PHYSICAL REVIEW B, 1988, 38 (14) :10113-10115

[8]

GESCHKENBEIN VB, 1988, SOV PHYS JETP, V67, P362

[9] TEMPERATURE-DEPENDENCE OF THE CRITICAL JOSEPHSON CURRENT IN SUPERCONDUCTOR INSULATOR NORMAL-METAL PROXIMITY JUNCTIONS NEAR TC [J].

HAN, S ;

WOLF, EL .

PHYSICAL REVIEW B, 1987, 35 (10) :4669-4672

[10] OBSERVATION OF NEGATIVE S-WAVE PROXIMITY EFFECT IN SUPERCONDUCTING UBE13 [J].

HAN, S ;

NG, KW ;

WOLF, EL ;

MILLIS, A ;

SMITH, JL ;

FISK, Z .

PHYSICAL REVIEW LETTERS, 1986, 57 (02) :238-241

← 1 2 3 →