Low magnetic relaxation in a single crystal and a melt processed NdBa2Cu3O7-δ sample

A. J.J. Van Dalen; M. R. Koblischka; H. Kojo; K. Sawada; T. Higuchi; M. Murakami

doi:10.1088/0953-2048/9/8/007

Low magnetic relaxation in a single crystal and a melt processed NdBa₂Cu₃O_7-δ sample

A. J.J. Van Dalen, M. R. Koblischka, H. Kojo, K. Sawada, T. Higuchi, M. Murakami

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

18 Citations (Scopus)

Abstract

Induced current densities j_s and magnetic relaxation rates S ≡ -d In j_s/d In t were measured over a wide temperature (5 ≤ T ≤ 90 K) and field range (0 ≤ μ₀H_a ≤ 7 T) on a single crystal and a melt processed sample of NdBa₂Cu₃O_7-δ using a SQUID magnetometer. The temperature dependence of the magnetic relaxation rate shows a pronounced minimum at elevated temperatures. This leads to very high values of the effective pinning energy U₀(77 K) = 4500 K and U₀(77 K) = 2900 K for the single crystal and the melt processed sample respectively, for an applied magnetic field μ₀H_a = 1.0 T. Furthermore, these samples show a well developed fishtail effect, leading to a current density j_s(77 K, μ₀H_a = 2 T) = 3 x 10⁴ A m^-2. This demonstrates that the fishtail effect is closely related to the low relaxation rates observed here.

Original language	English
Pages (from-to)	659-664
Number of pages	6
Journal	Superconductor Science and Technology
Volume	9
Issue number	8
DOIs	https://doi.org/10.1088/0953-2048/9/8/007
Publication status	Published - 1996 Aug 1
Externally published	Yes

ASJC Scopus subject areas

Ceramics and Composites
Condensed Matter Physics
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1088/0953-2048/9/8/007

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title = "Low magnetic relaxation in a single crystal and a melt processed NdBa2Cu3O7-δ sample",

abstract = "Induced current densities js and magnetic relaxation rates S ≡ -d In js/d In t were measured over a wide temperature (5 ≤ T ≤ 90 K) and field range (0 ≤ μ0Ha ≤ 7 T) on a single crystal and a melt processed sample of NdBa2Cu3O7-δ using a SQUID magnetometer. The temperature dependence of the magnetic relaxation rate shows a pronounced minimum at elevated temperatures. This leads to very high values of the effective pinning energy U0(77 K) = 4500 K and U0(77 K) = 2900 K for the single crystal and the melt processed sample respectively, for an applied magnetic field μ0Ha = 1.0 T. Furthermore, these samples show a well developed fishtail effect, leading to a current density js(77 K, μ0Ha = 2 T) = 3 x 104 A m-2. This demonstrates that the fishtail effect is closely related to the low relaxation rates observed here.",

author = "{Van Dalen}, {A. J.J.} and Koblischka, {M. R.} and H. Kojo and K. Sawada and T. Higuchi and M. Murakami",

year = "1996",

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doi = "10.1088/0953-2048/9/8/007",

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T1 - Low magnetic relaxation in a single crystal and a melt processed NdBa2Cu3O7-δ sample

AU - Van Dalen, A. J.J.

AU - Koblischka, M. R.

AU - Kojo, H.

AU - Sawada, K.

AU - Higuchi, T.

AU - Murakami, M.

PY - 1996/8/1

Y1 - 1996/8/1

N2 - Induced current densities js and magnetic relaxation rates S ≡ -d In js/d In t were measured over a wide temperature (5 ≤ T ≤ 90 K) and field range (0 ≤ μ0Ha ≤ 7 T) on a single crystal and a melt processed sample of NdBa2Cu3O7-δ using a SQUID magnetometer. The temperature dependence of the magnetic relaxation rate shows a pronounced minimum at elevated temperatures. This leads to very high values of the effective pinning energy U0(77 K) = 4500 K and U0(77 K) = 2900 K for the single crystal and the melt processed sample respectively, for an applied magnetic field μ0Ha = 1.0 T. Furthermore, these samples show a well developed fishtail effect, leading to a current density js(77 K, μ0Ha = 2 T) = 3 x 104 A m-2. This demonstrates that the fishtail effect is closely related to the low relaxation rates observed here.

AB - Induced current densities js and magnetic relaxation rates S ≡ -d In js/d In t were measured over a wide temperature (5 ≤ T ≤ 90 K) and field range (0 ≤ μ0Ha ≤ 7 T) on a single crystal and a melt processed sample of NdBa2Cu3O7-δ using a SQUID magnetometer. The temperature dependence of the magnetic relaxation rate shows a pronounced minimum at elevated temperatures. This leads to very high values of the effective pinning energy U0(77 K) = 4500 K and U0(77 K) = 2900 K for the single crystal and the melt processed sample respectively, for an applied magnetic field μ0Ha = 1.0 T. Furthermore, these samples show a well developed fishtail effect, leading to a current density js(77 K, μ0Ha = 2 T) = 3 x 104 A m-2. This demonstrates that the fishtail effect is closely related to the low relaxation rates observed here.

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Low magnetic relaxation in a single crystal and a melt processed NdBa₂Cu₃O_7-δ sample

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