Giant flux creep through the surface barriers and the irreversibility line in high-Tc superconductors

L. Burlachkov; V. B. Geshkenbein; A. E. Koshelev; A. I. Larkin; V. M. Vinokur

doi:10.1016/0921-4534(94)92612-3

Giant flux creep through the surface barriers and the irreversibility line in high-T_c superconductors

L. Burlachkov, V. B. Geshkenbein, A. E. Koshelev, A. I. Larkin, V. M. Vinokur

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Magnetic flux relaxation over the surface barrier in high temperature superconductors are investigated. Vortex dynamics controlled by the penetration both of pancake vortices and vortex lines are discussed. The penetration field H_p for pancakes decays exponentially with temperature. The size of the magnetization loop is determined by the decay of H_p during the process of relaxation, but its shape remains unchanged. The irreversibility line associated with the pancake penetration is given by H_irr ∞ exp(-2T/T_c), and may lie both above and below the melting line.

Original language	English
Pages (from-to)	2783-2784
Number of pages	2
Journal	Physica C: Superconductivity and its Applications
Volume	235-240
Issue number	PART 4
DOIs	https://doi.org/10.1016/0921-4534(94)92612-3
State	Published - Dec 1994

Bibliographical note

Funding Information:
This expressiodni ffersf rom the conventionaelx - pressionfo r the meltingli ne Bm --"~ 8SL02C4 ¢o/T2 by the factoro f lna/~(Hc2/H)/2In4( t/t0)i nstead of the Lindemannfa ctorc~. This impliest hat in YBCO the irreversibilityli ne as definedb y Eq. (7) lies below the meltingl ine since the usual observationfie lds are about 0.1Hc2, and as a resultt he surfaceb arrieri s suppressende ar the melting. On the contraryi n much more anisotropiBc SCCO materialtsh e meltingli ne at high temperaturemsa ybe closet o Hcx and tile irreversibilitlyin e from Eq. (7) can be located abovet he meltingli ne. Thereforein BSCCO the irreversibilitlyin e maya risef romtile surfacep inning rathert hanfrom tile freezingo f tile vortex liquid into a vortexs olid. We discussb rieflyt hef inites izee ffect\ [12\T].h e penetratiofnie ld for the rectangulasra mplew ith the thicknessh <<w , w beingt he transversseiz e is X/'~Hp (note the distinctionfr om the com-monlyu sedd emagnetizatifoanc toro f d/w for the sampleo f the ellipsoidasl hape).T he slopeo f the magnetizatiocnu rvei n the Meissners tateb elow lip is equalt o (H/4r)(w/d). In the field much biggert han the penetratiofnie ld ~Hp the magnetizatioisn M " H~/2H and doesn ot de-pendo n the demagnetizatifoanc tor. We thank Y. Yeahuruna nd E. Zeldovf or en-lighteningd iscussions.W ork supportedin part by the NSF fundedS ciencea ndT echnologCy enter for SuperconductivitCyo, ntractN o. DMR91-20000,a nd by U.S. DOE, BES-MaterialsS ci-ences,c ontractN o. W-31-109-ENG-38. ~EFERENCES 1. V. N Kopylov, et al, PhysicaC 170, 291 (i990).

Funding

This expressiodni ffersf rom the conventionaelx - pressionfo r the meltingli ne Bm --"~ 8SL02C4 ¢o/T2 by the factoro f lna/~(Hc2/H)/2In4( t/t0)i nstead of the Lindemannfa ctorc~. This impliest hat in YBCO the irreversibilityli ne as definedb y Eq. (7) lies below the meltingl ine since the usual observationfie lds are about 0.1Hc2, and as a resultt he surfaceb arrieri s suppressende ar the melting. On the contraryi n much more anisotropiBc SCCO materialtsh e meltingli ne at high temperaturemsa ybe closet o Hcx and tile irreversibilitlyin e from Eq. (7) can be located abovet he meltingli ne. Thereforein BSCCO the irreversibilitlyin e maya risef romtile surfacep inning rathert hanfrom tile freezingo f tile vortex liquid into a vortexs olid. We discussb rieflyt hef inites izee ffect\ [12\T].h e penetratiofnie ld for the rectangulasra mplew ith the thicknessh <<w , w beingt he transversseiz e is X/'~Hp (note the distinctionfr om the com-monlyu sedd emagnetizatifoanc toro f d/w for the sampleo f the ellipsoidasl hape).T he slopeo f the magnetizatiocnu rvei n the Meissners tateb elow lip is equalt o (H/4r)(w/d). In the field much biggert han the penetratiofnie ld ~Hp the magnetizatioisn M " H~/2H and doesn ot de-pendo n the demagnetizatifoanc tor. We thank Y. Yeahuruna nd E. Zeldovf or en-lighteningd iscussions.W ork supportedin part by the NSF fundedS ciencea ndT echnologCy enter for SuperconductivitCyo, ntractN o. DMR91-20000,a nd by U.S. DOE, BES-MaterialsS ci-ences,c ontractN o. W-31-109-ENG-38. ~EFERENCES 1. V. N Kopylov, et al, PhysicaC 170, 291 (i990).

Funders	Funder number
U.S. DOE	W-31-109-ENG-38
National Science Foundation	DMR91-20000

Access to Document

10.1016/0921-4534(94)92612-3

Cite this

@article{234a7acf0c084c0f8bfb1f03f4468d05,

title = "Giant flux creep through the surface barriers and the irreversibility line in high-Tc superconductors",

abstract = "Magnetic flux relaxation over the surface barrier in high temperature superconductors are investigated. Vortex dynamics controlled by the penetration both of pancake vortices and vortex lines are discussed. The penetration field Hp for pancakes decays exponentially with temperature. The size of the magnetization loop is determined by the decay of Hp during the process of relaxation, but its shape remains unchanged. The irreversibility line associated with the pancake penetration is given by Hirr ∞ exp(-2T/Tc), and may lie both above and below the melting line.",

author = "L. Burlachkov and Geshkenbein, {V. B.} and Koshelev, {A. E.} and Larkin, {A. I.} and Vinokur, {V. M.}",

note = "Funding Information: This expressiodni ffersf rom the conventionaelx - pressionfo r the meltingli ne Bm --{"}~ 8SL02C4 ¢o/T2 by the factoro f lna/~(Hc2/H)/2In4( t/t0)i nstead of the Lindemannfa ctorc~. This impliest hat in YBCO the irreversibilityli ne as definedb y Eq. (7) lies below the meltingl ine since the usual observationfie lds are about 0.1Hc2, and as a resultt he surfaceb arrieri s suppressende ar the melting. On the contraryi n much more anisotropiBc SCCO materialtsh e meltingli ne at high temperaturemsa ybe closet o Hcx and tile irreversibilitlyin e from Eq. (7) can be located abovet he meltingli ne. Thereforein BSCCO the irreversibilitlyin e maya risef romtile surfacep inning rathert hanfrom tile freezingo f tile vortex liquid into a vortexs olid. We discussb rieflyt hef inites izee ffect\ [12\T].h e penetratiofnie ld for the rectangulasra mplew ith the thicknessh <<w , w beingt he transversseiz e is X/'~Hp (note the distinctionfr om the com-monlyu sedd emagnetizatifoanc toro f d/w for the sampleo f the ellipsoidasl hape).T he slopeo f the magnetizatiocnu rvei n the Meissners tateb elow lip is equalt o (H/4r)(w/d). In the field much biggert han the penetratiofnie ld ~Hp the magnetizatioisn M {"} H~/2H and doesn ot de-pendo n the demagnetizatifoanc tor. We thank Y. Yeahuruna nd E. Zeldovf or en-lighteningd iscussions.W ork supportedin part by the NSF fundedS ciencea ndT echnologCy enter for SuperconductivitCyo, ntractN o. DMR91-20000,a nd by U.S. DOE, BES-MaterialsS ci-ences,c ontractN o. W-31-109-ENG-38. ~EFERENCES 1. V. N Kopylov, et al, PhysicaC 170, 291 (i990).",

year = "1994",

month = dec,

doi = "10.1016/0921-4534(94)92612-3",

language = "אנגלית",

volume = "235-240",

pages = "2783--2784",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier B.V.",

number = "PART 4",

}

TY - JOUR

T1 - Giant flux creep through the surface barriers and the irreversibility line in high-Tc superconductors

AU - Burlachkov, L.

AU - Geshkenbein, V. B.

AU - Koshelev, A. E.

AU - Larkin, A. I.

AU - Vinokur, V. M.

N1 - Funding Information: This expressiodni ffersf rom the conventionaelx - pressionfo r the meltingli ne Bm --"~ 8SL02C4 ¢o/T2 by the factoro f lna/~(Hc2/H)/2In4( t/t0)i nstead of the Lindemannfa ctorc~. This impliest hat in YBCO the irreversibilityli ne as definedb y Eq. (7) lies below the meltingl ine since the usual observationfie lds are about 0.1Hc2, and as a resultt he surfaceb arrieri s suppressende ar the melting. On the contraryi n much more anisotropiBc SCCO materialtsh e meltingli ne at high temperaturemsa ybe closet o Hcx and tile irreversibilitlyin e from Eq. (7) can be located abovet he meltingli ne. Thereforein BSCCO the irreversibilitlyin e maya risef romtile surfacep inning rathert hanfrom tile freezingo f tile vortex liquid into a vortexs olid. We discussb rieflyt hef inites izee ffect\ [12\T].h e penetratiofnie ld for the rectangulasra mplew ith the thicknessh <<w , w beingt he transversseiz e is X/'~Hp (note the distinctionfr om the com-monlyu sedd emagnetizatifoanc toro f d/w for the sampleo f the ellipsoidasl hape).T he slopeo f the magnetizatiocnu rvei n the Meissners tateb elow lip is equalt o (H/4r)(w/d). In the field much biggert han the penetratiofnie ld ~Hp the magnetizatioisn M " H~/2H and doesn ot de-pendo n the demagnetizatifoanc tor. We thank Y. Yeahuruna nd E. Zeldovf or en-lighteningd iscussions.W ork supportedin part by the NSF fundedS ciencea ndT echnologCy enter for SuperconductivitCyo, ntractN o. DMR91-20000,a nd by U.S. DOE, BES-MaterialsS ci-ences,c ontractN o. W-31-109-ENG-38. ~EFERENCES 1. V. N Kopylov, et al, PhysicaC 170, 291 (i990).

PY - 1994/12

Y1 - 1994/12

N2 - Magnetic flux relaxation over the surface barrier in high temperature superconductors are investigated. Vortex dynamics controlled by the penetration both of pancake vortices and vortex lines are discussed. The penetration field Hp for pancakes decays exponentially with temperature. The size of the magnetization loop is determined by the decay of Hp during the process of relaxation, but its shape remains unchanged. The irreversibility line associated with the pancake penetration is given by Hirr ∞ exp(-2T/Tc), and may lie both above and below the melting line.

AB - Magnetic flux relaxation over the surface barrier in high temperature superconductors are investigated. Vortex dynamics controlled by the penetration both of pancake vortices and vortex lines are discussed. The penetration field Hp for pancakes decays exponentially with temperature. The size of the magnetization loop is determined by the decay of Hp during the process of relaxation, but its shape remains unchanged. The irreversibility line associated with the pancake penetration is given by Hirr ∞ exp(-2T/Tc), and may lie both above and below the melting line.

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VL - 235-240

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JO - Physica C: Superconductivity and its Applications

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