Material Specification for Tl:2212; [Tl-Ba-Ca-Cu-O]
Process: Laser Ablation
Notes: "...measurements were made on laser ablated TBCCO superconducting thin films (about 700 nm thick) deposited on 1.0 x 1.0 x 0.05 cm3 (100) LaAlO3 substrates. The films were obtained from Superconductor Technologies Incorporated. ... For the unpatterned films the measured Tc values were between 101 K and 103 K, and values of 105 K were measured after patterning and annealing at 450 °C for 1 h. ... The film is oriented with its c axis perpendicular to the substrate and consists predominately of the (2212) phase, although evidence of the (2223) phase and some unidentified peaks are also observed."
Formula: Tl2Ba2CaCu2Ox
Informal Name: Tl:2212
Chemical Family: Tl-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: Superconductor Technologies Incorporated
Commercial Name:
Production Date:
Lot Number:
Production Form:
Critical Temperature for Tl:2212; [Tl-Ba-Ca-Cu-O]
| Critical Temperature (K) |
| 103 ± 2 |
Measurement Method: Four-probe method
"The DC transition temperature (T
c at R=0) of the films was measured using a standard four-point-probe technique." No additional measurement details were noted.
Cautions: Unevaluated Data
Critical Current Density for Tl:2212; [Tl-Ba-Ca-Cu-O]
| Temperature (K) |
Critical Current Density (kA/cm2) |
| 4.5 |
2800 |
| 77.0 |
160 |
Measurement Method: Magnetization method
"Magnetization moment measurements were performed using a Quantum Design Magnetic Property Measurement System. For these measurements, rectangular samples were cut from the films and oriented with their a-b plane normal to the magnetic field. Using Bean's model, the critical current density is defined as J
c = 30 ΔM/D where ΔM is the magnetization difference for increasing and decreasing field, and D is the diameter of the largest circle that could be inscribed in the rectangular sample."
Cautions: Evaluated Data
Surface Resistance for Tl:2212; [Tl-Ba-Ca-Cu-O]
| Type of Resonator () |
Resonance Frequency (GHz) |
Temperature (K) |
Surface Resistance (mΩ) |
| Ring |
8.4 |
19 |
3.2 |
| Ring |
8.4 |
35 |
3.1 |
| Ring |
8.4 |
56 |
3.3 |
| Ring |
8.4 |
65 |
4.0 |
| Ring |
8.4 |
78 |
4.6 |
| Ring |
8.4 |
85 |
5.8 |
| Ring |
8.4 |
95 |
9.2 |
| CBCPW |
10.8 |
31 |
6.1 |
| CBCPW |
10.8 |
40 |
6.1 |
| CBCPW |
10.8 |
50 |
5.8 |
| CBCPW |
10.8 |
61 |
5.9 |
| CBCPW |
10.8 |
70 |
6.1 |
| CBCPW |
10.8 |
81 |
6.3 |
| CBCPW |
10.8 |
90 |
6.5 |
| CBCPW |
10.8 |
100 |
11 |
| CBCPW |
10.8 |
105 |
73 |
Measurement Method: Resonator method
"...Conductor-backed coplanar waveguide (CBCPW) resonators... were made by Superconductor Technologies Incorporated from laser ablated films (700 nm thick) deposited onto 1.0 x 1.0 x 0.5 cm
3 (100) LaAlO
3 substrates with a gold ground plane. ... This resonator consisted of a coplanar waveguide (CPW) resonator (about 1.2 µm thick) and a 2 µm thick ground plane. A chromium layer (about 150 σ thick) was evaporated before the gold film in order to improve adhesion to the LaAlO
3 substrate. The resonators were tested by mounting them on a brass text fixture bolted to the cold finger of a helium-gas-closed-cycle refrigerator and enclosed inside a vacuum chamber with feed-throughs to allow coupling between the resonator and a coaxial waveguide."
Cautions: Evaluated Data
Digitized data were obtained from Figure 10 of the paper.
Penetration Depth for Tl:2212; [Tl-Ba-Ca-Cu-O]
| Temperature (K) |
Penetration Depth (σ) |
| 20 |
5536 |
| 40 |
5660 |
| 60 |
5854 |
| 81 |
6252 |
| 93 |
6792 |
| 99 |
7541 |
| 100 |
8053 |
| 102 |
8599 |
Measurement Method: Microwave method
The authors cite F.A. Miranda et al., J. Appl. Phys., Vol. 70, 5450 (1991), and summarize the procedure as follows. "Microwave power transmission measurements through TBCCO samples were performed at 33.5 GHz. ... The measurement technique consists in comparing the microwave signal transmitted perpendicularly through an HTS film with the incident signal to determine the power transmission coefficient (P). ...P can be used to determine... the distance a magnetic field penetrates into the superconducting material."
Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.
