Spatial variations of the superconductor gap structure in MgB2/Al composite

被引：19

作者：

Sharoni, A ^{[1
]}

Millo, O

Leitus, G

Reich, S

机构：

[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[2] Weizmann Inst Sci, Detp Mat & Interfaces, IL-76100 Rehovot, Israel

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2001年 / 13卷 / 22期

关键词：

D O I：

10.1088/0953-8984/13/22/109

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Composites consisting of MgB2 and Al, 11% by volume, undergo a transition-to-superconductivity onset at T-C = 38 K, close to the value reported for pure MgB2. The transition appears to have broadened, as determined by both magnetic and transport measurements, possibly due to the proximity effect and disorder. Spatially resolved tunnelling spectroscopy at 4.2 K shows a distribution of gap structures, from Bardeen-Coopel-Schrieffer-like spectra with 2 Delta /k(B)T(C) = 3.2 to spectra that are typical for proximity superconductors.

引用

页码：L503 / L508

页数：6

共 16 条

[1] Local density of states in a dirty normal metal connected to a superconductor [J].

Belzig, W ;

Bruder, C ;

Schon, G .

PHYSICAL REVIEW B, 1996, 54 (13) :9443-9448

[2] Boron isotope effect in superconducting MgB2 [J].

Bud'ko, SL ;

Lapertot, G ;

Petrovic, C ;

Cunningham, CE ;

Anderson, N ;

Canfield, PC .

PHYSICAL REVIEW LETTERS, 2001, 86 (09) :1877-1880

[3]

CHEN CT, 2001, CONDMAT0104285

[4] DIRECT MEASUREMENT OF QUASIPARTICLE-LIFETIME BROADENING IN A STRONG-COUPLED SUPERCONDUCTOR [J].

DYNES, RC ;

NARAYANAMURTI, V ;

GARNO, JP .

PHYSICAL REVIEW LETTERS, 1978, 41 (21) :1509-1512

[5] Superconducting proximity effect probed on a mesoscopic length scale [J].

Gueron, S ;

Pothier, H ;

Birge, NO ;

Esteve, D ;

Devoret, MH .

PHYSICAL REVIEW LETTERS, 1996, 77 (14) :3025-3028

[6]

Karapetrov G, 2001, PHYS REV LETT, V86, P4374, DOI 10.1103/PhysRevLett.86.4374

[7] Spatially resolved tunneling spectroscopy of superconducting wires with artificial pinning centers [J].

Levi, Y ;

Millo, O ;

Rizzo, ND ;

Prober, DE ;

Motowidlo, LR .

APPLIED PHYSICS LETTERS, 1998, 72 (04) :480-482

[8] Scanning tunneling microscope studies of the superconductor proximity effect [J].

Levi, Y ;

Millo, O ;

Rizzo, ND ;

Prober, DE ;

Motowidlo, LR .

PHYSICAL REVIEW B, 1998, 58 (22) :15128-15134

[9] Evidence for localized high-TC superconducting regions on the surface of Na-doped WO3 [J].

Levi, Y ;

Millo, O ;

Sharoni, A ;

Tsabba, Y ;

Leitus, G ;

Reich, S .

EUROPHYSICS LETTERS, 2000, 51 (05) :564-570

[10] TRANSITION TEMPERATURE OF STRONG-COUPLED SUPERCONDUCTORS [J].

MCMILLAN, WL .

PHYSICAL REVIEW, 1968, 167 (02) :331-&

← 1 2 →