NIST High Temp. Superconducting Materials (HTS) Database

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: Temperature-Dependent Anisotropic Magnetic Penetration Depth of Oxygen-Depleted YBa₂Cu₃O_7-δ
Author(s): N. Athanassopoulou and J.R. Cooper
Publication: Physica C Volume: 259 Issue: Not Available Year: 1996 Page(s): 326-336
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Thermoelectric Power, Penetration Depth

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 A. Porch et al., Physica C, Vol. 214, 214 (1993), and summarize the procedure as follows. "Two batches of sintered YBa₂Cu₃O_7-δ (...referred to as A and B, respectively) were prepared by conventional solid-state reaction methods... We used two different methods... to obtain the required grain-size distribution; (I) sedimentation in acetone (AR grade) after lightly grinding the powder by hand or (II) grinding in a ball-mill for 20 min followed by sieving through a 20 µm aperture stainless-steel sieve. ... The powder, wrapped in a gold foil, was then annealed in appropriate oxygen atmospheres and temperatures for 12 h to obtain the required δ's, quenched and kept in liquid nitrogen to avoid possible degradation. ... The powder was mixed in a slow-setting two-component epoxy (Ciba-Geigy) with a volume dilution ration of 1:20 (YBCO:epoxy) and put in an ultrasonic bath for about 10 min. It was then placed in a 7 T magnetic field with H (parallel to the ) c-axis and heated to 90 °C in about 10 min. It was then cooled naturally to room temperature in about 30 min. Cylindrical samples 4 mm in diameter and 3 mm high were cut with a scalpel or a diamond saw from the cured epoxy."
Formula: YBa₂Cu₃O_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]

Powder Batch Number ()	x of O_x (formula units)	Critical Temperature (K)
A(method I)	7.00	91
A(method I)	6.79	83
B(method I)	7.00	93
B(method I)	6.84	88
B(method I)	6.61	58
B(method I)	6.36	20
B(method I)	6.48	50
B(method II)	6.54	56
B(method II)	6.45	45

Measurement Method: Electrical resistance
No measurement details were noted.

Cautions: Unevaluated Data
Digitized data were obtained from Figure 1b of the paper.

Thermoelectric Power for Y:123; [Y-Ba-Cu-O]

Temperature (K)	Powder Batch Number ()	Thermoelectric Power (µV/K)
296	A	-0.18
296	B	-3.0

Measurement Method: Thermopower method
No measurement details were noted.

Cautions: Unevaluated Data

Penetration Depth for Y:123; [Y-Ba-Cu-O]

Direction ()	Corrected for fluctuations ()	x of O_x (formula units)	Temperature (K)	Penetration Depth (σ)
ab-plane	---	7.00	0	1430
ab-plane	---	7.00	0	1700
ab-plane	---	7.00	0	2400
ab-plane	---	6.85	0	2300
ab-plane	---	6.78	0	3800
ab-plane	---	6.62	0	6200
ab-plane	---	6.56	0	15000
ab-plane	---	6.50	0	8300
ab-plane	---	6.40	0	31000
ab-plane	No	7.0	78	2400
ab-plane	No	7.0	80	2800
ab-plane	No	7.0	82	3000
ab-plane	No	7.0	84	3200
ab-plane	No	7.0	86	3600
ab-plane	No	7.0	88	4300
ab-plane	No	7.0	90	6700
ab-plane	Yes	7.0	78	2100
ab-plane	Yes	7.0	80	2200
ab-plane	Yes	7.0	82	2400
ab-plane	Yes	7.0	84	2400
ab-plane	Yes	7.0	86	2600
ab-plane	Yes	7.0	88	2900
ab-plane	Yes	7.0	90	3300
ab-plane	No	6.78	62	2900
ab-plane	No	6.78	64	3100
ab-plane	No	6.78	66	3400
ab-plane	No	6.78	68	3700
ab-plane	No	6.78	70	4200
ab-plane	No	6.78	72	4800
ab-plane	No	6.78	74	5700
ab-plane	No	6.78	76	6800
ab-plane	No	6.78	78	9000
ab-plane	Yes	6.78	62	2400
ab-plane	Yes	6.78	64	2600
ab-plane	Yes	6.78	66	2700
ab-plane	Yes	6.78	68	2800
ab-plane	Yes	6.78	70	3100
ab-plane	Yes	6.78	72	3200
ab-plane	Yes	6.78	74	3400
ab-plane	Yes	6.78	76	3500
ab-plane	Yes	6.78	78	4700
c-axis	---	7.00	0	14000
c-axis	---	7.00	0	16000
c-axis	---	6.84	0	21200
c-axis	---	6.78	0	19400
c-axis	---	6.62	0	41000
c-axis	---	6.55	0	39000
c-axis	---	6.50	0	29000
c-axis	---	6.38	0	68000

Measurement Method: AC susceptibility
"The oxygen deficiency was determined by the weight loss of a 0.8 g reference sample. ... The AC susceptibility results were obtained using a commerical AC susceptometer. Measurements were made at (0.3 mT = 3 G) RMS and 333 Hz in a temperature range from 4.2 K to 100 K. The temperature was swept at 1 K/min. ... A pure Pb sphere was used to calibrate the apparatus at (0.3 mT) and 33 Hz where eddy currents were negligible."

Cautions: Evaluated Data
Digitized data were obtained from Figures 5 and 6 of the paper.