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NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: Anisotropic Coherence Length of YBa2Cu3O7-δ from Specific Heat Measurements near Tc
Author(s): W. Schnelle, P. Ernst, and D. Wohlleben
Publication: Annalen der Physik Volume: 2 Issue: Not Available Year: 1993 Page(s): 109-119
Editor(s): Not Available
Publisher: Johann Ambrosium Barth
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Specific Heat, Coherence Length

Materials and Properties

Y:123; [Y-Ba-Cu-O]
Material Specification for Y:123; [Y-Ba-Cu-O] Process: Solid State Reaction
Notes: The authors cite W. Schnelle et al., Physica C, Vol. 168, 465 (1990), and summarize the procedure as follows. "All three samples were prepared by the standard ceramic method and were single phase according to x-ray diffraction. Sample #1 was cooled down rapidly in the oven in an atmosphere of slowly flowing oxygen, while sample #2 was cooled down slower. In addition to the high temperature sintering sample #3 was annealed at 450 °C and 400 °C for 2x24h to establish a high oxygen content."
Formula: YBa2Cu3O7-x
Informal Name: Y:123
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Temperature for Y:123; [Y-Ba-Cu-O]
Magnetic Field (T) Critical Temperature (K)
1.00 89.0 ± 0.4
1.35 89.3 ± 0.4
Measurement Method: Susceptibility method
"The susceptibility of sample #1 above Tc was measured with a Faraday balance in external fields..." No additional measurement details were noted.

Cautions: Evaluated Data
Specific Heat for Y:123; [Y-Ba-Cu-O]
Sample Number () Temperature (K) Specific Heat (J kg-1 K-1)
1 70 135
1 80 163
1 90 190
1 92 197
1 93 194
1 100 207
1 110 228
1 120 247
2 70 136
2 80 165
2 90 192
2 91 195
2 93 195
2 100 210
2 110 230
2 120 249
3 72 139
3 80 161
3 90 188
3 93 189
3 100 204
3 110 224
3 120 243
Measurement Method: Adiabatic calorimeter
The authors cite E. Braun et al., Z. Physik B, Vol. 84, 333 (1991), and summarize the procedure as follows. "The specific heat of the three samples was measured in an adiabatic continuous heating calorimeter... Typical heating rates were around 10 mK/s. The resolution of the measurement is 5•10-4 of the absolute value at Tc, while the absolute accuracy is about 2%." The authors indicated that the coherence lengths were calculated from an analysis of the specific heat data using a model based on the Ginzburg-Landau theory.

Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
Coherence Length for Y:123; [Y-Ba-Cu-O]
Sample Number () Direction () Coherence Length (σ)
1 ab-plane 13.1
2 ab-plane 11.2
3 ab-plane 10.8
1 c-axis 1.92
2 c-axis 2.05
3 c-axis 2.13
Measurement Method: Adiabatic calorimeter
The authors cite E. Braun et al., Z. Physik B, Vol. 84, 333 (1991), and summarize the procedure as follows. "The specific heat of the three samples was measured in an adiabatic continuous heating calorimeter... Typical heating rates were around 10 mK/s. The resolution of the measurement is 5•10-4 of the absolute value at Tc, while the absolute accuracy is about 2%." The authors indicated that the coherence lengths were calculated from an analysis of the specific heat data using a model based on the Ginzburg-Landau theory.

Cautions: Evaluated Data