Equivalence of dynamical and conventional magnetic relaxation in high-Tc superconductors

A. J.J. Van Dalen, Michael Rudolf Koblischka, R. Griessen

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Measurements of the sweep rate dependence of the magnetic moment Script M sign of the high-Tc superconductor Bi2Sr2CaCu2O8 are shown to provide essentially the same information about the current dependence dU/dj of the activation energy U(j) as measurements of the time decay of Script M sign. However, at very short times the conventional relaxation rate R ≡ -d ln Script M sign/d In t is suppressed due to the existence of a waiting time τi and needs to be replaced by measurements of Script M sign at various sweep rates dBe/dt. For a sufficiently strong relaxation process, the magnetic moment decays non-logarithmically in time. This is caused by the non-linear current dependence of the activation energy. Therefore, it is necessary to evaluate the conventional relaxation rate R and the dynamical relaxation rate Q ≡ d In Script M sign/d ln(d Be/dt) at the same value of the current density. It is shown that the conventional and dynamical relaxation rates are in good agreement with each other in a wide range of temperature and magnetic field.

Original languageEnglish
Pages (from-to)157-167
Number of pages11
JournalPhysica C: Superconductivity and its Applications
Volume259
Issue number1-2
DOIs
Publication statusPublished - 1996 Mar 1
Externally publishedYes

Fingerprint

Magnetic relaxation
magnetic relaxation
Superconducting materials
equivalence
Magnetic moments
Activation energy
Relaxation processes
Temperature distribution
Current density
magnetic moments
Magnetic fields
activation energy
decay
temperature distribution
current density
magnetic fields

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this

Equivalence of dynamical and conventional magnetic relaxation in high-Tc superconductors. / Van Dalen, A. J.J.; Koblischka, Michael Rudolf; Griessen, R.

In: Physica C: Superconductivity and its Applications, Vol. 259, No. 1-2, 01.03.1996, p. 157-167.

Research output: Contribution to journalArticle

@article{652f63964edd4668a08221a2803ebd4a,
title = "Equivalence of dynamical and conventional magnetic relaxation in high-Tc superconductors",
abstract = "Measurements of the sweep rate dependence of the magnetic moment Script M sign of the high-Tc superconductor Bi2Sr2CaCu2O8 are shown to provide essentially the same information about the current dependence dU/dj of the activation energy U(j) as measurements of the time decay of Script M sign. However, at very short times the conventional relaxation rate R ≡ -d ln Script M sign/d In t is suppressed due to the existence of a waiting time τi and needs to be replaced by measurements of Script M sign at various sweep rates dBe/dt. For a sufficiently strong relaxation process, the magnetic moment decays non-logarithmically in time. This is caused by the non-linear current dependence of the activation energy. Therefore, it is necessary to evaluate the conventional relaxation rate R and the dynamical relaxation rate Q ≡ d In Script M sign/d ln(d Be/dt) at the same value of the current density. It is shown that the conventional and dynamical relaxation rates are in good agreement with each other in a wide range of temperature and magnetic field.",
author = "{Van Dalen}, {A. J.J.} and Koblischka, {Michael Rudolf} and R. Griessen",
year = "1996",
month = "3",
day = "1",
doi = "10.1016/0921-4534(96)00063-9",
language = "English",
volume = "259",
pages = "157--167",
journal = "Physica C: Superconductivity and its Applications",
issn = "0921-4534",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Equivalence of dynamical and conventional magnetic relaxation in high-Tc superconductors

AU - Van Dalen, A. J.J.

AU - Koblischka, Michael Rudolf

AU - Griessen, R.

PY - 1996/3/1

Y1 - 1996/3/1

N2 - Measurements of the sweep rate dependence of the magnetic moment Script M sign of the high-Tc superconductor Bi2Sr2CaCu2O8 are shown to provide essentially the same information about the current dependence dU/dj of the activation energy U(j) as measurements of the time decay of Script M sign. However, at very short times the conventional relaxation rate R ≡ -d ln Script M sign/d In t is suppressed due to the existence of a waiting time τi and needs to be replaced by measurements of Script M sign at various sweep rates dBe/dt. For a sufficiently strong relaxation process, the magnetic moment decays non-logarithmically in time. This is caused by the non-linear current dependence of the activation energy. Therefore, it is necessary to evaluate the conventional relaxation rate R and the dynamical relaxation rate Q ≡ d In Script M sign/d ln(d Be/dt) at the same value of the current density. It is shown that the conventional and dynamical relaxation rates are in good agreement with each other in a wide range of temperature and magnetic field.

AB - Measurements of the sweep rate dependence of the magnetic moment Script M sign of the high-Tc superconductor Bi2Sr2CaCu2O8 are shown to provide essentially the same information about the current dependence dU/dj of the activation energy U(j) as measurements of the time decay of Script M sign. However, at very short times the conventional relaxation rate R ≡ -d ln Script M sign/d In t is suppressed due to the existence of a waiting time τi and needs to be replaced by measurements of Script M sign at various sweep rates dBe/dt. For a sufficiently strong relaxation process, the magnetic moment decays non-logarithmically in time. This is caused by the non-linear current dependence of the activation energy. Therefore, it is necessary to evaluate the conventional relaxation rate R and the dynamical relaxation rate Q ≡ d In Script M sign/d ln(d Be/dt) at the same value of the current density. It is shown that the conventional and dynamical relaxation rates are in good agreement with each other in a wide range of temperature and magnetic field.

UR - http://www.scopus.com/inward/record.url?scp=0030107630&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0030107630&partnerID=8YFLogxK

U2 - 10.1016/0921-4534(96)00063-9

DO - 10.1016/0921-4534(96)00063-9

M3 - Article

VL - 259

SP - 157

EP - 167

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 1-2

ER -