SUPPRESSION OF MAGNETIC-FLUX NOISE IN YBA2CU3O7-X BY A SUPERCURRENT

被引：24

作者：

FERRARI, MJ ^{[1
]}

WELLSTOOD, FC ^{[1
]}

KINGSTON, JJ ^{[1
]}

CLARKE, J ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV MAT SCI, CTR ADV MAT, BERKELEY, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.67.1346

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic-flux noise generated by a patterned film of YBa2Cu3O7-x is reversibly suppressed by the application of a supercurrent. The total noise power decreases by an order of magnitude, in quantitative agreement with a model involving thermally activated vortex hopping between pairs of pinning sites of nearly equal pinning energy. The model yields a force constant of 6 x 10(-5) N/m for a vortex at a typical pinning site, and a hopping distance which increases with temperature from 13 nm at 4.2 K to 64 nm at 60 K. The number density of vortices is at least 0.02-mu-m-2, even in a magnetic field of less than 1-mu-T.

引用

页码：1346 / 1349

页数：4

共 21 条

[1] TUNNEL JUNCTION DC SQUID - FABRICATION, OPERATION, AND PERFORMANCE [J].

CLARKE, J ;

GOUBAU, WM ;

KETCHEN, MB .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1976, 25 (1-2) :99-144

[2]

CLEM JR, UNPUB

[3] ENERGY SCALES FOR NOISE PROCESSES IN METALS [J].

DUTTA, P ;

DIMON, P ;

HORN, PM .

PHYSICAL REVIEW LETTERS, 1979, 43 (09) :646-649

[4] LOW MAGNETIC-FLUX NOISE OBSERVED IN LASER-DEPOSITED INSITU FILMS OF YB2CU3OY AND IMPLICATIONS FOR HIGH-TC SQUIDS [J].

FERRARI, MJ ;

JOHNSON, M ;

WELLSTOOD, FC ;

CLARKE, J ;

INAM, A ;

WU, XD ;

NAZAR, L ;

VENKATESAN, T .

NATURE, 1989, 341 (6244) :723-725

[5] FLUX NOISE AND FLUX CREEP IN YBCO THIN-FILMS [J].

FERRARI, MJ ;

JOHNSON, M ;

WELLSTOOD, FC ;

CLARKE, J ;

ROSENTHAL, PA ;

HAMMOND, RH ;

BEASLEY, MR .

IEEE TRANSACTIONS ON MAGNETICS, 1989, 25 (02) :806-809

[6] DISTRIBUTION OF FLUX-PINNING ENERGIES IN YBA2CU3O7-DELTA AND BI2SR2CACU2O8+DELTA FROM FLUX NOISE [J].

FERRARI, MJ ;

JOHNSON, M ;

WELLSTOOD, FC ;

CLARKE, J ;

MITZI, D ;

ROSENTHAL, PA ;

EOM, CB ;

GEBALLE, TH ;

KAPITULNIK, A ;

BEASLEY, MR .

PHYSICAL REVIEW LETTERS, 1990, 64 (01) :72-75

[7] FLUX NOISE FROM SUPERCONDUCTING YBA2CU3O7-X FLUX TRANSFORMERS [J].

FERRARI, MJ ;

KINGSTON, JJ ;

WELLSTOOD, FC ;

CLARKE, J .

APPLIED PHYSICS LETTERS, 1991, 58 (10) :1106-1108

[8]

FERRARI MJ, UNPUB

[9] VORTEX-GLASS SUPERCONDUCTIVITY - A POSSIBLE NEW PHASE IN BULK HIGH-TC OXIDES [J].

FISHER, MPA .

PHYSICAL REVIEW LETTERS, 1989, 62 (12) :1415-1418

[10] EVIDENCE FOR A VORTEX-GLASS STATE FROM MECHANICAL MEASUREMENTS OF FLUX-LINE-INDUCED ENERGY-DISSIPATION IN YBA2CU3O7-X THIN-FILMS [J].

GREGORY, S ;

ROGERS, CT ;

VENKATESAN, T ;

WU, XD ;

INAM, A ;

DUTTA, B .

PHYSICAL REVIEW LETTERS, 1989, 62 (13) :1548-1551

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