Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Solid State Reaction
Notes: The authors cite X.L. Wu et al., Science, Vol. 248, 1211 (1990), and summarize the procedure as follows. "The BSCCO single crystals were grown from CuO rich melts... Briefly, as-grown BSCCO crystals were annealed at 545 °C in (1.2 MPa = 12 atm) O2 for several days. These "oxygen-annealed" crystals exhibit a Tc of about 90 K, and a transition width of 4-6 K... cleaved oxygen-annealed crystals of BSCCO exhibit a high conductivity (10-100 µΩ·cm) over most of the crystal surface. The high-conductivity surfaces do not show phonon structure in the loss spectra."
Formula: Bi2Sr2CaCu2O8+x
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 Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Critical Temperature (K) |
| 87 |
Measurement Method: Magnetization method
"Temperature dependent magnetization curves (were) recorded in a field of (796 A/m = 10 Oe)..." No additional measurement details were noted.
Cautions: Unevaluated Data
The value of T
c was obtained from the magnetization data of Fig. 1 in the paper.
Magnetic Susceptibility for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 4.7 |
-0.0596 |
| 65.0 |
-0.0585 |
| 75.3 |
-0.0574 |
| 78.1 |
-0.0556 |
| 80.0 |
-0.0519 |
| 83.7 |
-0.0348 |
| 87.4 |
-0.0011 |
| 100.0 |
0.0 |
Measurement Method: Magnetization method
"Temperature dependent magnetization curves (were) recorded in a field of (796 A/m = 10 Oe)..." No additional measurement details were noted.
Cautions: Unevaluated Data
Energy Gap(2 delta) for Bi:2212; [Bi-Sr-Ca-Cu-O]
| Temperature (K) |
Energy Gap (2Δ) (meV) |
| 32 |
48 |
| 36 |
48 |
| 43 |
48 |
| 49 |
49 |
| 62 |
49 |
| 65 |
46 |
| 68 |
46 |
| 72 |
47 |
| 83 |
44 |
| 88 |
29 |
| 91 |
0 |
Measurement Method: HREELS
"The HREELS (high-resolution electron energy loss spectroscopy) experiments were carried out using a fixed 90° scattering geometry, and collecting inelastically scattered electrons only within a 1°-1.5° lobe of the elastically scattered beam. In this regime of small momentum transfer... dipole scattering theory can be used to quantitatively analyze the experimental energy loss spectra... In the high conductivity limit the experimental scattering probability is proportional to the real part of the frequency dependent resistivity... Hence, we can assign the magnitude of 2Δ to the onset of (the frequency dependent resistivity): for energies less than the gap (the resistivity)= 0, but for (frequencies) > 2Δ (the resistivity) will be finite... To determine (the resistivity) we deconvolute the elastic peak from the spectra. The intensity of the resulting energy loss spectra is proportional to (the product of frequency and resistivity)... The curves obtained from data recorded below T
c exhibit a clear onset to (frequency dependent resistivity), while curves obtained from spectra recorded above T
c show very little frequency dependence."
Cautions: Evaluated Data
Digitized data were obtained from Figure 6a of the paper.
