Thermally activated flux motion and quantum creep in YBa2Cu3O7 and Y2Ba4Cu8O16 films

Wen Hai-Hu; R. Griessen; D. G. de Groot; B. Dam; J. Rector

doi:10.1016/0925-8388(93)90770-N

Thermally activated flux motion and quantum creep in YBa₂Cu₃O₇ and Y₂Ba₄Cu₈O₁₆ films

Wen Hai-Hu^*, R. Griessen, D. G. de Groot, B. Dam, J. Rector

^*Corresponding author for this work

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

11 Citations (Scopus)

Abstract

The dynamical relaxation rate Q dln j_s/dln(dB/dt) where j_s is the current induced in a superconductor when the external field is swept at a rate dB/dt, has been measured in YBa₂Cu₃O₇ and Y₂Ba₄Cu₈O₁₆ films of 100 nm and 180 nm thickness as a function of magnetic field at temperatures between 2 K and T_c. The data show i) a non zero relaxation at low T due to quantum creep, ii) a plateau between 15 and ∼ 50 K and iii) a divergence when T approaches the irreversibility line. The data are analyzed within the collective pinning model. At low temperatures it is shown that both j_s and Q are influenced by quantum creep.

Original language	English
Pages (from-to)	427-430
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	195
Issue number	C
DOIs	https://doi.org/10.1016/0925-8388(93)90770-N
Publication status	Published - 1993
Externally published	Yes

Bibliographical note

Funding Information:
We acknowlegde interesting discussions with dr. A. Koshelev, H.G. Schnack and A. van Dalen. This work is part of the research program of the Stichting voor Funda-menteel Onderzoek der Materie (FOM) which is financially supported by NWO.

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title = "Thermally activated flux motion and quantum creep in YBa2Cu3O7 and Y2Ba4Cu8O16 films",

abstract = "The dynamical relaxation rate Q dln js/dln(dB/dt) where js is the current induced in a superconductor when the external field is swept at a rate dB/dt, has been measured in YBa2Cu3O7 and Y2Ba4Cu8O16 films of 100 nm and 180 nm thickness as a function of magnetic field at temperatures between 2 K and Tc. The data show i) a non zero relaxation at low T due to quantum creep, ii) a plateau between 15 and ∼ 50 K and iii) a divergence when T approaches the irreversibility line. The data are analyzed within the collective pinning model. At low temperatures it is shown that both js and Q are influenced by quantum creep.",

author = "Wen Hai-Hu and R. Griessen and {de Groot}, {D. G.} and B. Dam and J. Rector",

note = "Funding Information: We acknowlegde interesting discussions with dr. A. Koshelev, H.G. Schnack and A. van Dalen. This work is part of the research program of the Stichting voor Funda-menteel Onderzoek der Materie (FOM) which is financially supported by NWO.",

year = "1993",

doi = "10.1016/0925-8388(93)90770-N",

language = "English",

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T1 - Thermally activated flux motion and quantum creep in YBa2Cu3O7 and Y2Ba4Cu8O16 films

AU - Hai-Hu, Wen

AU - Griessen, R.

AU - de Groot, D. G.

AU - Dam, B.

AU - Rector, J.

N1 - Funding Information: We acknowlegde interesting discussions with dr. A. Koshelev, H.G. Schnack and A. van Dalen. This work is part of the research program of the Stichting voor Funda-menteel Onderzoek der Materie (FOM) which is financially supported by NWO.

PY - 1993

Y1 - 1993

N2 - The dynamical relaxation rate Q dln js/dln(dB/dt) where js is the current induced in a superconductor when the external field is swept at a rate dB/dt, has been measured in YBa2Cu3O7 and Y2Ba4Cu8O16 films of 100 nm and 180 nm thickness as a function of magnetic field at temperatures between 2 K and Tc. The data show i) a non zero relaxation at low T due to quantum creep, ii) a plateau between 15 and ∼ 50 K and iii) a divergence when T approaches the irreversibility line. The data are analyzed within the collective pinning model. At low temperatures it is shown that both js and Q are influenced by quantum creep.

AB - The dynamical relaxation rate Q dln js/dln(dB/dt) where js is the current induced in a superconductor when the external field is swept at a rate dB/dt, has been measured in YBa2Cu3O7 and Y2Ba4Cu8O16 films of 100 nm and 180 nm thickness as a function of magnetic field at temperatures between 2 K and Tc. The data show i) a non zero relaxation at low T due to quantum creep, ii) a plateau between 15 and ∼ 50 K and iii) a divergence when T approaches the irreversibility line. The data are analyzed within the collective pinning model. At low temperatures it is shown that both js and Q are influenced by quantum creep.

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DO - 10.1016/0925-8388(93)90770-N

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ER -

Thermally activated flux motion and quantum creep in YBa₂Cu₃O₇ and Y₂Ba₄Cu₈O₁₆ films

Abstract

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