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

A. J J Van Dalen, Michael Rudolf Koblischka, H. Kojo, K. Sawada, T. Higuchi, Masato Murakami

Research output: Contribution to journalArticle

32 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)659-664
Number of pages6
JournalSuperconductor Science and Technology
Volume9
Issue number8
DOIs
Publication statusPublished - 1996 Aug
Externally publishedYes

Fingerprint

Magnetic relaxation
magnetic relaxation
Single crystals
single crystals
Current density
current density
SQUIDs
Induced currents
Magnetometers
Temperature
magnetometers
Magnetic fields
temperature dependence
temperature
magnetic fields
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Low magnetic relaxation in a single crystal and a melt processed NdBa2Cu3O7-δ sample. / Van Dalen, A. J J; Koblischka, Michael Rudolf; Kojo, H.; Sawada, K.; Higuchi, T.; Murakami, Masato.

In: Superconductor Science and Technology, Vol. 9, No. 8, 08.1996, p. 659-664.

Research output: Contribution to journalArticle

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AU - Van Dalen, A. J J

AU - Koblischka, Michael Rudolf

AU - Kojo, H.

AU - Sawada, K.

AU - Higuchi, T.

AU - Murakami, Masato

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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.

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