Material Specification for CaLa:122; [La(Ca)-Cu-O]
Process: Solid State Reaction
Notes: "Single crystals... were grown from a CuO rich nonstoichiometric solution of oxide starting materials. The mixture of La2CaCu2O6 and CuO was placed in a Pt crucible 40 mm (in diameter) x 40 mm in size. The material was heated to 1200 °C for 2 h, slowly cooled to 900 °C at a rate of 4 °C/h and then furnace cooled to room temperature."
Formula: La1.87Ca1.13Cu2O6
Informal Name: CaLa:122
Chemical Family: La(Ca)-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for CaLa:122; [La(Ca)-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.825 |
-- |
19.41 |
Measurement Method: X-ray diffraction
Cautions: Unevaluated Data
No measurement details were noted.
Critical Temperature for CaLa:122; [La(Ca)-Cu-O]
| Critical Temperature (K) |
| 40 |
Measurement Method: Montogomery's method
"The electrical resistivity of the single crystal parallel and perpendicular to the basal plane was measured by Montogomery's method. The crystal was fixed on a sapphire plate and gold wire was attached at the four corners of the crystal with gold paste. The dimensions of the crystal were about 0.9 mm x 0.9 mm x 0.2 mm... H
(T) was determined from the midpoint of the (resistive) transition."
Cautions: Evaluated Data
Critical Flux Density Hc2 for CaLa:122; [La(Ca)-Cu-O]
| Field Direction () |
Temperature (K) |
Crit.Mag.Flux Density Hc2 (T) |
| //c |
20 |
12.0 |
| //c |
27 |
5.0 |
| //c |
32 |
2.0 |
| //c |
34 |
1.1 |
| //ab |
34 |
12.0 |
| //ab |
35 |
10.0 |
| //ab |
37 |
6.0 |
| //ab |
38 |
4.1 |
| //ab |
39 |
2.0 |
| //ab |
41 |
1.0 |
| //ab |
43 |
0.0 |
Measurement Method: Montogomery's method
"The electrical resistivity of the single crystal parallel and perpendicular to the basal plane was measured by Montogomery's method. The crystal was fixed on a sapphire plate and gold wire was attached at the four corners of the crystal with gold paste. The dimensions of the crystal were about 0.9 mm x 0.9 mm x 0.2 mm... H
(T) was determined from the midpoint of the (resistive) transition."
Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.
Resistivity (normal state) for CaLa:122; [La(Ca)-Cu-O]
| Direction () |
Temperature (K) |
Resistivity (normal state) (mΩ·cm) |
| //ab |
44 |
0.01 |
| //ab |
45 |
0.09 |
| //ab |
48 |
0.17 |
| //ab |
54 |
0.25 |
| //ab |
82 |
0.31 |
| //ab |
149 |
0.42 |
| //ab |
202 |
0.54 |
| //ab |
247 |
0.67 |
| //ab |
289 |
0.80 |
| //c |
41 |
0.2 |
| //c |
42 |
3.2 |
| //c |
43 |
6.2 |
| //c |
49 |
10.1 |
| //c |
53 |
13.2 |
| //c |
142 |
15.8 |
| //c |
192 |
18.5 |
| //c |
231 |
21.0 |
| //c |
287 |
24.8 |
Measurement Method: Montogomery's method
"The electrical resistivity of the single crystal parallel and perpendicular to the basal plane was measured by Montogomery's method. The crystal was fixed on a sapphire plate and gold wire was attached at the four corners of the crystal with gold paste. The dimensions of the crystal were about 0.9 mm x 0.9 mm x 0.2 mm... H
(T) was determined from the midpoint of the (resistive) transition."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Magnetic Susceptibility for CaLa:122; [La(Ca)-Cu-O]
| Annealing Time (h) |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 20 |
4 |
-0.68 |
| 20 |
9 |
-0.62 |
| 20 |
15 |
-0.52 |
| 20 |
18 |
-0.40 |
| 20 |
19 |
-0.31 |
| 20 |
23 |
-0.18 |
| 20 |
24 |
-0.09 |
| 20 |
31 |
0 |
| 20 |
41 |
0 |
| 100 |
5 |
-1.30 |
| 100 |
9 |
-1.25 |
| 100 |
11 |
-1.27 |
| 100 |
14 |
-1.24 |
| 100 |
17 |
-1.22 |
| 100 |
21 |
-1.18 |
| 100 |
27 |
-1.10 |
| 100 |
31 |
-0.9 |
| 100 |
35 |
-0.4 |
| 100 |
37 |
-0.1 |
| 100 |
39 |
0 |
| 100 |
49 |
0 |
| 100 |
58 |
0 |
| 100 |
64 |
0 |
Measurement Method: SQUID magnetometer
"The magnetic properties of the single crystals were measured using a superconducting quantum interference (SQUID) magnetometer in a magnetic field... applied parallel to the ab-plane."
Cautions: Evaluated Data
Digitized data were obtained from Figure 1 of the paper.
