Effect of twin planes in the magnetization hysteresis loops of NdBa2Cu3O7 single crystals

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Abstract

The angular dependence of the critical currents is investigated in a moderately twinned NdBa2Cu3O7-δ (NdBCO) single crystal in the temperature range 30≤T≤90 K. In intermediate fields around the fishtail peak a reduction of critical current density due to twin structure is observed up to 90 K. This effect implies that vortices retain their three-dimensional character practically up to TC. The effect of twin planes disappeared at external fields declined more than θ≈15° from the c axis (twin planes). In this case, the hysteresis loops exhibited a clear fishtail shape. The intermediate peak observed previously in NdBCO single crystal at θ =0° is identified with the low-field limit of the twin plane activity.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number22
Publication statusPublished - 1998 Dec 1
Externally publishedYes

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Hysteresis loops
Magnetization
critical current
hysteresis
Single crystals
magnetization
Critical currents
single crystals
Vortex flow
vortices
current density
Temperature
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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title = "Effect of twin planes in the magnetization hysteresis loops of NdBa2Cu3O7 single crystals",
abstract = "The angular dependence of the critical currents is investigated in a moderately twinned NdBa2Cu3O7-δ (NdBCO) single crystal in the temperature range 30≤T≤90 K. In intermediate fields around the fishtail peak a reduction of critical current density due to twin structure is observed up to 90 K. This effect implies that vortices retain their three-dimensional character practically up to TC. The effect of twin planes disappeared at external fields declined more than θ≈15° from the c axis (twin planes). In this case, the hysteresis loops exhibited a clear fishtail shape. The intermediate peak observed previously in NdBCO single crystal at θ =0° is identified with the low-field limit of the twin plane activity.",
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T1 - Effect of twin planes in the magnetization hysteresis loops of NdBa2Cu3O7 single crystals

AU - Jirsa, M.

AU - Koblischka, Michael Rudolf

AU - Higuchi, T.

AU - Murakami, Masato

PY - 1998/12/1

Y1 - 1998/12/1

N2 - The angular dependence of the critical currents is investigated in a moderately twinned NdBa2Cu3O7-δ (NdBCO) single crystal in the temperature range 30≤T≤90 K. In intermediate fields around the fishtail peak a reduction of critical current density due to twin structure is observed up to 90 K. This effect implies that vortices retain their three-dimensional character practically up to TC. The effect of twin planes disappeared at external fields declined more than θ≈15° from the c axis (twin planes). In this case, the hysteresis loops exhibited a clear fishtail shape. The intermediate peak observed previously in NdBCO single crystal at θ =0° is identified with the low-field limit of the twin plane activity.

AB - The angular dependence of the critical currents is investigated in a moderately twinned NdBa2Cu3O7-δ (NdBCO) single crystal in the temperature range 30≤T≤90 K. In intermediate fields around the fishtail peak a reduction of critical current density due to twin structure is observed up to 90 K. This effect implies that vortices retain their three-dimensional character practically up to TC. The effect of twin planes disappeared at external fields declined more than θ≈15° from the c axis (twin planes). In this case, the hysteresis loops exhibited a clear fishtail shape. The intermediate peak observed previously in NdBCO single crystal at θ =0° is identified with the low-field limit of the twin plane activity.

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