Damping of the de Haas-van Alphen oscillations in the superconducting state of MgB2 -: art. no. 144501

被引：15

作者：

Fletcher, JD

Carrington, A

Kazakov, SM

Karpinski, J

机构：

[1] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[2] Swiss Fed Inst Technol, Festkorperphys Lab, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.70.144501

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The de Haas-van Alphen (dHvA) signal arising from orbits on the pi Fermi surface sheet of the two-gap superconductor MgB2 has been observed in the vortex state below H-c2. An extra attenuation of the dHvA signal, beyond those effects described in the conventional Lifshitz-Kosevich expression, is seen due to the opening of the superconducting gap. Our data show that the pi band gap is still present up to H-c2. The data are compared to current theories of dHvA oscillations in the superconducting state which allow us to extract estimates for the evolution of the pi band gap with magnetic field. Contrary to results for other materials, we find that the most recent theories dramatically underestimate the damping in MgB2.

引用

页码：144501 / 1

页数：9

共 56 条

[1] Anisotropy of the superconducting state properties and phase diagram of MgB2 by torque magnetometry on single crystals [J].

Angst, M ;

Puzniak, R ;

Wisniewski, A ;

Roos, J ;

Keller, H ;

Miranovic, P ;

Jun, J ;

Kazakov, SM ;

Karpinski, J .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2003, 385 (1-2) :143-153

[2] Temperature and field dependence of the anisotropy of MgB2 -: art. no. 167004 [J].

Angst, M ;

Puzniak, R ;

Wisniewski, A ;

Jun, J ;

Kazakov, SM ;

Karpinski, J ;

Roos, J ;

Keller, H .

PHYSICAL REVIEW LETTERS, 2002, 88 (16) :1670041-1670044

[3] Quantum oscillations in URu2Si2 [J].

Bergemann, C ;

Julian, SR ;

McMullan, GJ ;

Howard, BK ;

Lonzarich, GG ;

Lejay, P ;

Brison, JP ;

Flouquet, J .

PHYSICA B, 1997, 230 :348-350

[4] 2-BAND SUPERCONDUCTIVITY IN NB-DOPED SRTIO3 [J].

BINNIG, G ;

BARATOFF, A ;

HOENIG, HE ;

BEDNORZ, JG .

PHYSICAL REVIEW LETTERS, 1980, 45 (16) :1352-1355

[5] Heat conduction in the vortex state of NbSe2:: Evidence for multiband superconductivity -: art. no. 117003 [J].

Boaknin, E ;

Tanatar, MA ;

Paglione, J ;

Hawthorn, D ;

Ronning, F ;

Hill, RW ;

Sutherland, M ;

Taillefer, L ;

Sonier, J ;

Hayden, SM ;

Brill, JW .

PHYSICAL REVIEW LETTERS, 2003, 90 (11) :4

[6] Specific heat of single crystal MgB2:: A two-band superconductor with two different anisotropies -: art. no. 257001 [J].

Bouquet, F ;

Wang, Y ;

Sheikin, I ;

Plackowski, T ;

Junod, A ;

Lee, S ;

Tajima, S .

PHYSICAL REVIEW LETTERS, 2002, 89 (25)

[7] Phenomenological two-gap model for the specific heat of MgB [J].

Bouquet, F ;

Wang, Y ;

Fisher, RA ;

Hinks, DG ;

Jorgensen, JD ;

Junod, A ;

Phillips, NE .

EUROPHYSICS LETTERS, 2001, 56 (06) :856-862

[8] THEORY OF DENSITY OF STATES OF PURE TYPE-2 SUPERCONDUCTORS IN HIGH MAGNETIC FIELDS [J].

BRANDT, U ;

PESCH, W ;

TEWORDT, L .

ZEITSCHRIFT FUR PHYSIK, 1967, 201 (03) :209-&

[9]

BUGOSLAVSKY Y, 2003, CONDMAT0307540

[10] Determination of the Fermi surface of MgB2 by the de Haas-van Alphen effect -: art. no. 037003 [J].

Carrington, A ;

Meeson, PJ ;

Cooper, JR ;

Balicas, L ;

Hussey, NE ;

Yelland, EA ;

Lee, S ;

Yamamoto, A ;

Tajima, S ;

Kazakov, SM ;

Karpinski, J .

PHYSICAL REVIEW LETTERS, 2003, 91 (03)

← 1 2 3 4 5 6 →