Material Specification for La:21; [La(Sr)-Cu-O]
Process: Floating Zone
Notes: The authors cite I. Tanaka et al., Nature (London), Vol. 337, 21 (1989), and summarize the procedure as follows. "The sample was prepared from a Cu-O flux using a traveling solvent floating-zone technique. The crystal was aligned along the principal axes of the tetragonal cell and polished so the faces were parallel to within 1°, leaving a finished sample with dimensions 2.890 x 2.816 x 2.405 mm3 all ±0.01 mm, the shortest dimension corresponsing to the tetragonal c axis."
Formula: La1.86Sr0.14CuO4
Informal Name: La:21
Chemical Family: La(Sr)-Cu-O
Chemical Class: Oxide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Density (mass) for La:21; [La(Sr)-Cu-O]
Measurement Method: Unknown density method
Cautions: Unevaluated Data
No measurement details were noted.
Critical Temperature for La:21; [La(Sr)-Cu-O]
Critical Temperature (K) |
36 |
Measurement Method: Susceptibility method
"(The) onset temperature for superconductivity (was measured) in a field of (2 mT = 20 G), with a Meissner fraction of 6% for the c axis parallel to the field. Magnetization hysteresis loops... yielded critical currents..."
Cautions: Evaluated Data
Critical Current Density for La:21; [La(Sr)-Cu-O]
Temperature (K) |
Critical Current Density (kA/cm2) |
5 |
100 |
Measurement Method: Susceptibility method
"(The) onset temperature for superconductivity (was measured) in a field of (2 mT = 20 G), with a Meissner fraction of 6% for the c axis parallel to the field. Magnetization hysteresis loops... yielded critical currents..."
Cautions: Evaluated Data
Elasticity Tensor for La:21; [La(Sr)-Cu-O]
C11 = | 248 |
C12 = | 48 |
C13 = | |
C22 = | |
C23 = | 65 |
C33 = | 205 |
C44 = | 67.4 |
C55 = | |
C66 = | 58.3 |
Measurement Method: Ultrasonic method
"The crystal was mounted into the resonant-ultrasound cell... Diametrically opposite corners contact two transducers that serve as driver and receiver. The transducer contact force is (0.1 N = 10
4 dyn). The transducers have a lowest resonant frequency above 5 MHz, well above the range of frequencies we used, thereby ensuring that all resonances observed are associated with the sample... The amplitudes of resonances are influenced by mounting and corner imperfections. Therefore, only resonance frequencies f
i are used. The f
i, density, and dimensions of the sample overdetermine the shear moduli c
44, c
66, enabling us to check for consistency. However, the four moduli c
11, c
22, c
12, c
23 are underdetermined by one constraint, which we take from the bulk-modulus data of Ledbetter et al., Physica C (Amsterdam), Vol. 162-164, 460 (1989)."
Cautions: Evaluated Data