Strong pinning and vortex energy distributions in single-crystalline Ba(Fe1-xCox)2As2

被引：38

作者：

Demirdis, S. ^{[1
,2
]}

van der Beek, C. J. ^{[1
,2
]}

Fasano, Y. ^{[3
,4
]}

Cejas Bolecek, N. R. ^{[3
,4
]}

Pastoriza, H. ^{[3
,4
]}

Colson, D. ^{[5
]}

Rullier-Albenque, F. ^{[5
]}

机构：

[1] Ecole Polytech, CNRS, UMR 7642, Solides Irradies Lab, F-91128 Palaiseau, France

[2] Ecole Polytech, CEA DSM IRAMIS, F-91128 Palaiseau, France

[3] Ctr Atom Bariloche, Lab Bajas Temp, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[4] Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[5] CEA DSM IRAMIS, Serv Phys Etat Condense, F-91198 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 09期

关键词：

SUPERCONDUCTOR; PENETRATION;

D O I：

10.1103/PhysRevB.84.094517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The interrelation between heterogeneity and flux pinning is studied in Ba(Fe(1-)xCo(x))(2)As-2 single crystals with widely varying Co content x. Magnetic Bitter decoration of the superconducting vortex ensemble in crystals with x = 0.075 and x = 0.1 reveals highly disordered vortex structures. The width of the Meissner belt observed at the edges of the crystals, and above the surface steps formed by cleaving, as well as the width of the intervortex distance distribution, indicate that the observed vortex ensemble is established at a temperature just below the critical temperature T-c. The vortex interaction energy and pinning force distributions extracted from the images strongly suggest that the vortex lattice disorder is attributable to strong pinning due to spatial fluctuations of T-c and of the superfluid density. Correlating the results with the critical current density yields a typical length scale of the relevant disorder of 40-60 nm.

引用

页数：8

共 28 条

[1] SYNTHETIC HIGH-FIELD, HIGH-CURRENT SUPERCONDUCTOR [J].

BEAN, CP ;

DOYLE, MV ;

PINCUS, AG .

PHYSICAL REVIEW LETTERS, 1962, 9 (03) :93-&

[2] Superconductor disks and cylinders in an axial magnetic field. I. Flux penetration and magnetization curves [J].

Brandt, EH .

PHYSICAL REVIEW B, 1998, 58 (10) :6506-6522

[3] STUDIES OF HTSC CRYSTAL MAGNETIZATION FEATURES USING INDICATOR MAGNETOOPTIC FILMS WITH INPLANE ANISOTROPY [J].

DOROSINSKII, LA ;

INDENBOM, MV ;

NIKITENKO, VI ;

OSSIPYAN, YA ;

POLYANSKII, AA ;

VLASKOVLASOV, VK .

PHYSICA C, 1992, 203 (1-2) :149-156

[4] Vortex imaging in Co-doped BaFe2As2 [J].

Eskildsen, M. R. ;

Vinnikov, L. Ya. ;

Veshchunov, I. S. ;

Artemova, T. M. ;

Blasius, T. D. ;

Densmore, J. M. ;

Dewhurst, C. D. ;

Ni, N. ;

Kreyssig, A. ;

Bud'ko, S. L. ;

Canfield, P. C. ;

Goldman, A. I. .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2009, 469 (9-12) :529-534

[5] Vortices in superconducting Ba(Fe0.93Co0.07)2As2 studied via small-angle neutron scattering and Bitter decoration [J].

Eskildsen, M. R. ;

Vinnikov, L. Ya. ;

Blasius, T. D. ;

Veshchunov, I. S. ;

Artemova, T. M. ;

Densmore, J. M. ;

Dewhurst, C. D. ;

Ni, N. ;

Kreyssig, A. ;

Bud'ko, S. L. ;

Canfield, P. C. ;

Goldman, A. I. .

PHYSICAL REVIEW B, 2009, 79 (10)

[6] Commensurability and stability in nonperiodic systems [J].

Fasano, Y ;

De Seta, M ;

Menghini, M ;

Pastoriza, H ;

de la Cruz, F .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2005, 102 (11) :3898-3902

[7] Local Quasiparticle Density of States of Superconducting SmFeAsO1-xFx Single Crystals: Evidence for Spin-Mediated Pairing [J].

Fasano, Y. ;

Maggio-Aprile, I. ;

Zhigadlo, N. D. ;

Katrych, S. ;

Karpinski, J. ;

Fischer, O. .

PHYSICAL REVIEW LETTERS, 2010, 105 (16)

[8] Magnetic-decoration imaging of structural transitions induced in vortex matter [J].

Fasano, Yanina ;

Menghini, Mariela .

SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 2008, 21 (02)

[9] Jc Scaling and Anisotropies in Co-Doped Ba-122 Thin Films [J].

Haenisch, Jens ;

Iida, Kazumasa ;

Haindl, Silvia ;

Kurth, Fritz ;

Kauffmann, Alexander ;

Kidszun, Martin ;

Thersleff, Thomas ;

Freudenberger, Jens ;

Schultz, Ludwig ;

Holzapfel, Bernhard .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 2011, 21 (03) :2887-2890

[10] Symmetry and disorder of the vitreous vortex lattice in overdoped BaFe2-xCoxAs2: Indication for strong single-vortex pinning [J].

Inosov, D. S. ;

Shapoval, T. ;

Neu, V. ;

Wolff, U. ;

White, J. S. ;

Haindl, S. ;

Park, J. T. ;

Sun, D. L. ;

Lin, C. T. ;

Forgan, E. M. ;

Viazovska, M. S. ;

Kim, J. H. ;

Laver, M. ;

Nenkov, K. ;

Khvostikova, O. ;

Kuehnemann, S. ;

Hinkov, V. .

PHYSICAL REVIEW B, 2010, 81 (01)

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