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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: Resistive Transition in Magnetic Fields for a Single Crystal of a Tl-Ba-Ca-Cu-O Superconductor
Author(s): K. Togano, H. Kumakura, H. Mukaida, K. Kawaguchi, and M. Nakao
Publication: Japanese Journal of Applied Physics Volume: 28 Issue: 6 Year: 1989 Page(s): L907-L909
Editor(s): Not Available
Publisher: Physical Soc. of Japan and the Jpn. Soc. of Applied Physics
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Flux Density Hc2, Resistivity (normal state)

Materials and Properties

Tl:2234; [Tl-Ba-Ca-Cu-O]
Material Specification for Tl:2234; [Tl-Ba-Ca-Cu-O] Process: Solid State Reaction
Notes: "Starting materials were high-purity powders of Tl2O3, CaO and CuO and BaCuO2 compounds prepared by reacting BaCO3 and CuO powders. These were mixed with the nominal composition of Tl2Ba2Ca3Cu4Oy. The powder mixture was then melted by heating in an alumina crucible to 930 °C, followed by very slow cooling. Small single crystals were obtained by crushing the ingot. They were thin plate pieces with typical dimensions of 0.5 x 0.5 x 0.025 mm3."
Formula: Tl2Ba2Ca3Cu4Ox
Informal Name: Tl:2234
Chemical Family: Tl-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Flux Density Hc2 for Tl:2234; [Tl-Ba-Ca-Cu-O]
Field Direction () Temperature (K) Crit.Mag.Flux Density Hc2 (T)
//ab-plane 48 12.0
//ab-plane 57 8.0
//ab-plane 75 4.0
//ab-plane 89 2.0
//ab-plane 93 1.0
//ab-plane 96 0.5
//c-axis 82 12.0
//c-axis 86 8.0
//c-axis 92 4.0
//c-axis 96 2.0
//c-axis 98 1.0
//c-axis 99 0.5
//c-axis 100 0.0
Measurement Method: Four-probe method
"To make low-resistance contacts, Au was deposited by evaporation on four separated parts of the crystal and 25 µm diameter gold wires were bonded to each part using Ag epoxy. Resistivity-versus-temperature curves were measured in magnetic fields up to 12 T generated by a superconducting magnet. The temperature was measured with a carbon-glass resistor. The magnetic field was applied perpendicular and parallel to the basal plane (001), but always perpendicular to the current direction. Most measurements were done using a d.c. current of 1 mA ( (about) 10 A/cm2)... we defined the upper critical field H , as the midpoint of the transition."

Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Resistivity (normal state) for Tl:2234; [Tl-Ba-Ca-Cu-O]
Field Direction () Magnetic Field (T) Temperature (K) Resistivity (normal state) (mΩ·cm)
//c-axis 12 30 0.00
//c-axis 12 50 0.00
//c-axis 12 60 0.04
//c-axis 12 70 0.17
//c-axis 12 80 0.38
//c-axis 12 90 0.63
//c-axis 12 100 0.79
//c-axis 12 110 0.86
//c-axis 12 120 0.88
//c-axis 8 30 0.00
//c-axis 8 60 0.00
//c-axis 8 70 0.08
//c-axis 8 80 0.25
//c-axis 8 90 0.54
//c-axis 8 100 0.77
//c-axis 8 110 0.84
//c-axis 8 120 0.88
//c-axis 4 30 0.00
//c-axis 4 60 0.00
//c-axis 4 70 0.01
//c-axis 4 80 0.09
//c-axis 4 90 0.33
//c-axis 4 100 0.74
//c-axis 4 110 0.84
//c-axis 4 120 0.88
//c-axis 2 30 0.00
//c-axis 2 70 0.00
//c-axis 2 80 0.02
//c-axis 2 90 0.16
//c-axis 2 95 0.47
//c-axis 2 100 0.73
//c-axis 2 110 0.85
//c-axis 2 120 0.88
//c-axis 1 30 0.00
//c-axis 1 80 0.00
//c-axis 1 90 0.04
//c-axis 1 95 0.30
//c-axis 1 100 0.69
//c-axis 1 110 0.84
//c-axis 1 120 0.89
//c-axis 0.5 30 0.00
//c-axis 0.5 80 0.00
//c-axis 0.5 90 0.01
//c-axis 0.5 95 0.30
//c-axis 0.5 100 0.62
//c-axis 0.5 105 0.81
//c-axis 0.5 110 0.85
//c-axis 0.5 120 0.88
//c-axis 0 30 0.00
//c-axis 0 90 0.00
//c-axis 0 95 0.01
//c-axis 0 100 0.21
//c-axis 0 102 0.53
//c-axis 0 105 0.79
//c-axis 0 110 0.84
//c-axis 0 120 0.87
//ab-plane 12 30 0.00
//ab-plane 12 40 0.12
//ab-plane 12 50 0.55
//ab-plane 12 60 0.84
//ab-plane 12 70 0.91
//ab-plane 12 80 0.92
//ab-plane 12 90 0.91
//ab-plane 12 100 0.91
//ab-plane 12 110 0.92
//ab-plane 12 120 0.92
//ab-plane 8 30 0.00
//ab-plane 8 40 0.02
//ab-plane 8 50 0.23
//ab-plane 8 60 0.59
//ab-plane 8 70 0.79
//ab-plane 8 80 0.88
//ab-plane 8 90 0.90
//ab-plane 8 100 0.90
//ab-plane 8 110 0.91
//ab-plane 8 120 0.92
//ab-plane 4 30 0.00
//ab-plane 4 40 0.00
//ab-plane 4 50 0.02
//ab-plane 4 60 0.08
//ab-plane 4 70 0.33
//ab-plane 4 80 0.60
//ab-plane 4 90 0.76
//ab-plane 4 100 0.85
//ab-plane 4 110 0.89
//ab-plane 4 120 0.92
//ab-plane 2 30 0.00
//ab-plane 2 60 0.00
//ab-plane 2 70 0.08
//ab-plane 2 80 0.26
//ab-plane 2 90 0.53
//ab-plane 2 100 0.75
//ab-plane 2 110 0.89
//ab-plane 2 120 0.92
//ab-plane 1 30 0.00
//ab-plane 1 60 0.00
//ab-plane 1 70 0.04
//ab-plane 1 80 0.16
//ab-plane 1 90 0.45
//ab-plane 1 100 0.75
//ab-plane 1 110 0.89
//ab-plane 1 120 0.92
//ab-plane 0.5 30 0.00
//ab-plane 0.5 70 0.00
//ab-plane 0.5 80 0.06
//ab-plane 0.5 90 0.24
//ab-plane 0.5 100 0.73
//ab-plane 0.5 110 0.89
//ab-plane 0.5 120 0.92
//ab-plane 0 30 0.00
//ab-plane 0 60.0 0.0
//ab-plane 0 90 0.00
//ab-plane 0 100 0.33
//ab-plane 0 105 0.77
//ab-plane 0 110 0.86
//ab-plane 0 120 0.92
Measurement Method: Four-probe method
"To make low-resistance contacts, Au was deposited by evaporation on four separated parts of the crystal and 25 µm diameter gold wires were bonded to each part using Ag epoxy. Resistivity-versus-temperature curves were measured in magnetic fields up to 12 T generated by a superconducting magnet. The temperature was measured with a carbon-glass resistor. The magnetic field was applied perpendicular and parallel to the basal plane (001), but always perpendicular to the current direction. Most measurements were done using a d.c. current of 1 mA ( (about) 10 A/cm2)... we defined the upper critical field H , as the midpoint of the transition."

Cautions: Evaluated Data
Digitized data were obtained from Figure 1a and 1b of the paper.