TWO-GAP NATURE OF THE BULK SUPERCONDUCTOR (Mg1-xAlx)B2 WITH LOW (x ≤ 0.07)Al DOPING-Reference-Cited by-同舟云学术

TWO-GAP NATURE OF THE BULK SUPERCONDUCTOR (Mg1-xAlx)B2 WITH LOW (x ≤ 0.07)Al DOPING

Published:2007-07-30 Issue:18n19 Volume:21 Page:3314-3316
ISSN:0217-9792
Container-title:International Journal of Modern Physics B
language:en
Short-container-title:Int. J. Mod. Phys. B

Author:

PARK MIN-SEOK¹,KIM JUNG-DAE¹,LEE HYE-GYONG¹,KIM HEON-JUNG¹,LEE SUNG-IK¹,JUNG MYUNG-HWA²,JO YOUNGHUN²

Affiliation:

1. National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

2. Quantum Material Laboratory, Korea Basic Science Institute, Daejeon 305-333, Republic of Korea

Abstract

We have investigated the two-gap nature of bulk ( Mg 1-x Al x) B 2 for 0 ≤ x ≤ 0.07 by studying the upper critical field Hc2(T). The Hc2(T) is analyzed based on the dirty-limit two-gap model. While the effective diffusivities of the π-band [Formula: see text] decreased gradually, those of the σ-band [Formula: see text] were relatively unchanged, which indicated that unlike the 2 dimensional σ-band, the isotropic π-band is seriously affected by the Al doping. The upward curvature of Hc2(T) near Tc is also explained by the dirty-limit two-gap model.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

Link

https://www.worldscientific.com/doi/pdf/10.1142/S0217979207044445

Reference11 articles.

1. Superconductivity at 39 K in magnesium diboride

2. Superconductivity of Metallic Boron inMgB2

3. Two-Band Superconductivity inMgB2

4. Thermal conductivity of single-crystallineMgB2

5. Effect of two bands on the scaling of critical current density inMgB2thin films