Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Melt Processed
Notes: "The single crystals were grown from a melt mixture of Bi2O3, SrCO3, CaCO3 and CuO in a high-purity Al2O3 crucible and annealed at 850 °C for seven days in air... The dimensions of the crystal in the basal plane amount to 2.5 mm and 1.45 mm, respectively, the thickness along the crystallographic c-direction is 0.4 mm, the total mass 9.44 mg."
Formula: Bi2Sr2CaCu2O8
Informal Name: Bi:2212
Chemical Family: Bi-Sr-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 Bi:2212; [Bi-Sr-Ca-Cu-O]
| Field Direction () |
Temperature (K) |
Crit.Mag.Flux Density Hc2 (T) |
| //ab-plane |
79.5 |
0.0 |
| //ab-plane |
79.5 |
0.5 |
| //ab-plane |
79.9 |
1.0 |
| //ab-plane |
80.0 |
2.0 |
| //ab-plane |
80.8 |
4.0 |
| //ab-plane |
81.2 |
6.0 |
| //ab-plane |
81.5 |
8.0 |
| //c-axis |
79.8 |
0.0 |
| //c-axis |
80.5 |
0.5 |
| //c-axis |
81.0 |
1.0 |
| //c-axis |
81.5 |
2.0 |
| //c-axis |
82.0 |
4.0 |
| //c-axis |
82.5 |
8.0 |
Measurement Method: SQUID magnetometer
"All the experiments were done in a SQUID magnetometer, equipped with a superconducting 8 T magnet, at temperatures between 5 K and 100 K. The magnetometer was operated in two modes. In the first, the magnetic moments were measured as a function of field at fixed temperature... Four scans between the two pick-up coils were... made (total time: 6 min) and the signals evaluated... In the second mode, the crystal was either cooled in "zero" field (typically 1.5 mT, zfc) or in a certain field (fc) with a cooling rate of about 0.1 K per minute, while the moments were recorded continuously. The temperature was measured at the beginning and at the end of every four scans and an average temperature assigned to the average moment recorded during these four scans... the irreversibility line... can be determined in two ways, either from the field, where the magnetization loops (M-H curves at constant temperatuare) become reversible, or from the temperature where the fc/zfc data at constant field begin to deviate... Tc2 and consequently Hc2 are determined by linear extrapolation of the moments to zero."
Cautions: Evaluated Data
"...a very strange temperature dependence of the field "H
" is obtained. After a very flat decrease at low fields...the slope changes sign and the nucleation fields start to increase with temperature. A more detailed inspection of the transition region shows that the transition becomes increasingly smeared out when the field is increased, and hence linear extrapolation must fail. We note, however, that a behavior of this kind could be consistent with spin fluctuations, which tend to suppress Tc in the absence of magnetic field, but are then considerably reduced in the presence of stronger magnetic fields." Digitized data were obtained from Figure 9.
Penetration Depth for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Field Direction (no unit) |
Temperature (K) |
Penetration Depth (σ) |
| H//ab |
40 |
11000 |
| H//ab |
60 |
16000 |
| H//ab |
65 |
18000 |
| H//ab |
70 |
23000 |
| H//ab |
77 |
72000 |
| H//c |
20 |
5000 |
| H//c |
40 |
6000 |
| H//c |
60 |
7000 |
| H//c |
65 |
8000 |
| H//c |
70 |
9000 |
| H//c |
77 |
21000 |
Measurement Method: Ginzburg-Landau theory
The authors cite S. Mitra et al., Phys. Rev. B, Vol. 40, 2674 (1989), and summarize the procedure as follows. "According to standard Ginzburg-Landau theory, the magnetization depends on the logarithm of the induction B at intermediate fields... These functional dependencies of the magnetization have been tested for the reversible parts of the magnetization at all investigated temperatures."
Cautions: Evaluated Data
Digitized data were obtained from Figure 12 of the paper.
Irreversibility Field for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Field Direction (no unit) |
Temperature (K) |
Irreversibility Field (T) |
| H//ab |
16.0 |
8.0 |
| H//ab |
17.0 |
6.0 |
| H//ab |
17.5 |
4.0 |
| H//ab |
19.8 |
3.0 |
| H//ab |
21.0 |
2.0 |
| H//ab |
26.5 |
1.0 |
| H//ab |
30.5 |
0.5 |
| H//ab |
48.0 |
0.1 |
| H//ab |
77.0 |
0.0 |
| H//c |
11.4 |
8.0 |
| H//c |
11.9 |
7.0 |
| H//c |
14.2 |
4.0 |
| H//c |
17.9 |
2.0 |
| H//c |
21.2 |
1.0 |
| H//c |
25.4 |
0.5 |
| H//c |
37.5 |
0.1 |
| H//c |
68.0 |
0 |
Measurement Method: SQUID magnetometer
"All the experiments were done in a SQUID magnetometer, equipped with a superconducting 8 T magnet, at temperatures between 5 K and 100 K. The magnetometer was operated in two modes. In the first, the magnetic moments were measured as a function of field at fixed temperature... Four scans between the two pick-up coils were... made (total time: 6 min) and the signals evaluated... In the second mode, the crystal was either cooled in "zero" field (typically 1.5 mT, zfc) or in a certain field (fc) with a cooling rate of about 0.1 K per minute, while the moments were recorded continuously. The temperature was measured at the beginning and at the end of every four scans and an average temperature assigned to the average moment recorded during these four scans... the irreversibility line... can be determined in two ways, either from the field, where the magnetization loops (M-H curves at constant temperatuare) become reversible, or from the temperature where the fc/zfc data at constant field begin to deviate... Tc2 and consequently Hc2 are determined by linear extrapolation of the moments to zero."
Cautions: Evaluated Data
Digitized data were obtained from Figure 7 of the paper.
