Bibliographic Information
Title: Pressure Dependence of the Superconducting Transition Temperature in Bi
2Sr
2CaCu
2O
8+y as a Function of Oxygen Content
Author(s): R. Sieburger, P. Muller, and J.S. Schilling
Publication: Physica C
Volume: 181
Issue: Not Available
Year: 1991
Page(s): 335-339
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature
Materials and Properties
Bi:2212; [Bi-Sr-Ca-Cu-O]
Material Specification for Bi:2212; [Bi-Sr-Ca-Cu-O]
Process: Melt Processed
Notes: The authors cite J. Bock et al., Solid State Commun. Vol. 72 (1989) 453, and summarize the procedure as follows. "The polycrystalline powder sample... was prepared in the laboratories of Hoechst AG by a special melt process followed by oxygen enrichment;... The oxygen-enriched sample is then placed in the crucible of a Faraday magnetometer with a furnace insert and heated to elevated temperature in high vacuum to drive off oxygen"
Formula: Bi2Sr2CaCu2O8+y
Informal Name: Bi:2212
Chemical Family: Bi-Sr-Ca-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Critical Temperature for Bi:2212; [Bi-Sr-Ca-Cu-O]
y of O8+y (formula units) |
dTc/dp (K/GPa) |
Critical Temperature (K) |
0.24 |
1.6 |
70.4 |
0.15 |
1.5 |
90.2 |
0.11 |
1.4 |
88.5 |
Measurement Method: Ac susceptibility
"Pure hydrostatic pressure... is generated with a helium gas system. In the present experiment, the onset of superconductivity occurs at a temperature... which is always above the melting curve of helium, so that the applied pressure is purely hydrostatic... The pressure on the sample is measured to an accuracy of (±2 MPa = ±20 bar) with a calibrated manganin coil... The CuBe pressure cell is connected to the gas compressor via a CuBe capillary and is placed in a continuous-flow cryostat. The temperature is measured with two sets of calibrated Pt and Ge thermometers... The rate of temperature sweep is 0.1-0.2 K/min... Superconductivity is detected by measuring the AC susceptibility with a standard lock-in technique. The coil system... consisting of a primary and two oppositely wound secondary coils is placed inside the cell."
Cautions: Evaluated Data
The authors note that dT
c/dp has an uncertainty of about 0.2 K/GPa.