NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J


Bibliographic Information

Title: Magnetic and Resistive Measurements of the Superconducting Critical Fields of Melt-Cast Ba0.65K0.35BiO3
Author(s): W.K. Kwok, U. Welp, G.W. Crabtree, K.G. Vandervoort, R. Hulscher, Y. Zheng, B. Dabrowski, and D.G. Hinks
Publication: Physical Review B Volume: 40 Issue: 13 Year: 1989 Page(s): 9400-9403
Editor(s): Not Available
Publisher: American Physical Society
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Flux Density Hc2, Resistivity (normal state), Magnetic Susceptibility, Penetration Depth, Coherence Length, Critical Flux Density Hc1

Materials and Properties

Ba:11; [Ba(K)-Bi-O]
Material Specification for Ba:11; [Ba(K)-Bi-O] Process: Melt Processed
Notes: The authors cite D.G. Hinks et al., Appl. Phys. Lett., Vol. 54, 1585 (1989), and summarize the procedure as follows. "... a melt-cast polycrystalline sample of Ba0.65K0.35BiO3 (was) synthesized by a novel technique..." No additional processing details were noted.
Formula: Ba0.65K0.35BiO3
Informal Name: Ba:11
Chemical Family: Ba(K)-Bi-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Flux Density Hc2 for Ba:11; [Ba(K)-Bi-O]
Temperature (K) Crit.Mag.Flux Density Hc2 (T)
16.0 9.1
18.3 7.0
20.9 5.0
23.3 3.0
26.3 1.5
28.1 0.6
29.9 0.1
30.0 0.0
Measurement Method: Four-probe method
"ac resistivity was measured with the standard four-probe technique. Leads were attached to the sample with phosphor bronze positive pressure contact wires and silver paint. ac transverse magnetoresistance was measured in fields up to 8 T at temperatures down to 4 K with a measuring current of 0.1 mA at 17 Hz... the upper-critical-field phase diagram (was) obtained from both the magnetic and resistive measurements... Previous experiments in fields up to 8 T have not shown the concave downward behavior that is expected in H on the basis of WHH formalism. Therefore, a linear extrapolation consistent with the Ginzburg-Landau theory may be more appropriate. The corresponding critical field is H (0)=22.7 T which we used for all of the following calculations." The authors indicated that the coherence length was estimated from the relation H (0) = Φ0/2¦L2 where Φ0 is the flux quantum and L is the coherence length.

Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.
Resistivity (normal state) for Ba:11; [Ba(K)-Bi-O]
Magnetic Field (T) Temperature (K) Resistivity (normal state) (mΩ·cm)
0 5.0 0
0 24.9 0
0 29.6 1
0 29.9 3
0 30.3 36
0 30.9 53
0 34.9 53
1 5.0 0
1 24.5 1
1 26.8 13
1 27.1 27
1 27.5 41
1 28.0 53
1 34.9 54
2 5.0 0
2 10.0 0
2 15.3 1
2 21.3 1
2 24.6 13
2 25.6 29
2 26.4 51
2 27.1 53
2 35.2 53
3 5.0 0
3 10.4 0
3 15.3 1
3 18.2 1
3 21.9 8
3 23.3 25
3 24.6 46
3 25.5 53
3 30.4 54
3 35.2 54
4 10.0 0
4 15.1 1
4 18.4 4
4 21.7 18
4 22.5 38
4 23.3 50
4 24.4 53
4 28.4 53
4 35.2 54
5 5.0 0
5 10.4 1
5 13.3 1
5 18.5 9
5 21.1 30
5 21.9 46
5 22.8 53
5 27.3 54
5 35.2 54
6 5.0 0
6 10.6 1
6 15.6 8
6 18.6 19
6 19.8 39
6 21.7 52
6 23.5 53
6 27.8 54
6 35.2 54
7 5.0 0
7 9.7 1
7 15.4 12
7 18.1 22
7 18.9 44
7 21.5 53
7 26.9 53
7 35.2 54
8 6.6 1
8 9.5 3
8 14.0 12
8 17.5 30
8 18.5 45
8 19.0 52
8 20.6 53
8 27.1 54
8 35.2 54
Measurement Method: Four-probe method
"ac resistivity was measured with the standard four-probe technique. Leads were attached to the sample with phosphor bronze positive pressure contact wires and silver paint. ac transverse magnetoresistance was measured in fields up to 8 T at temperatures down to 4 K with a measuring current of 0.1 mA at 17 Hz... the upper-critical-field phase diagram (was) obtained from both the magnetic and resistive measurements... Previous experiments in fields up to 8 T have not shown the concave downward behavior that is expected in H on the basis of WHH formalism. Therefore, a linear extrapolation consistent with the Ginzburg-Landau theory may be more appropriate. The corresponding critical field is H (0)=22.7 T which we used for all of the following calculations." The authors indicated that the coherence length was estimated from the relation H (0) = Φ0/2¦L2 where Φ0 is the flux quantum and L is the coherence length.

Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Magnetic Susceptibility for Ba:11; [Ba(K)-Bi-O]
Magnetic Field (T) Temperature (K) Magnetic Susceptibility (arbitrary)
1 24.5 -0.22
1 25.5 -0.14
1 26.6 -0.07
1 27.0 -0.04
1 27.4 -0.02
1 27.9 -0.01
1 31.0 -0.01
1 35.0 -0.01
2 22.1 -0.12
2 23.6 -0.07
2 24.9 -0.03
2 25.3 -0.02
2 26.0 -0.02
2 27.0 -0.02
2 30.5 -0.02
2 34.9 -0.02
3 20.2 -0.08
3 22.1 -0.05
3 23.5 -0.03
3 24.1 -0.02
3 24.6 -0.02
3 25.5 -0.02
3 29.0 -0.02
3 32.0 -0.02
3 35.0 -0.02
4 18.1 -0.06
4 20.1 -0.04
4 21.5 -0.03
4 22.5 -0.02
4 24.1 -0.02
4 28.5 -0.02
4 32.5 -0.02
4 35.0 -0.02
5 16.5 -0.05
5 19.0 -0.03
5 21.6 -0.02
5 22.5 -0.02
5 26.0 -0.02
5 30.0 -0.02
5 35.0 -0.02
Measurement Method: SQUID magnetometer
"Magnetic measurements were performed in a custom-built superconducting quantum interference device (SQUID) magnetometer designed for very low fields and in a commerical Quantum Design SQUID magnetometer for high fields up to 5 T... H may be determined from the low-field regime of the magnetization curve where M(H) first deviates from linearity."

Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.
Penetration Depth for Ba:11; [Ba(K)-Bi-O]
Temperature (K) Penetration Depth (σ)
0 2200
Measurement Method: Four-probe method
"ac resistivity was measured with the standard four-probe technique. Leads were attached to the sample with phosphor bronze positive pressure contact wires and silver paint. ac transverse magnetoresistance was measured in fields up to 8 T at temperatures down to 4 K with a measuring current of 0.1 mA at 17 Hz... the upper-critical-field phase diagram (was) obtained from both the magnetic and resistive measurements... Previous experiments in fields up to 8 T have not shown the concave downward behavior that is expected in H on the basis of WHH formalism. Therefore, a linear extrapolation consistent with the Ginzburg-Landau theory may be more appropriate. The corresponding critical field is H (0)=22.7 T which we used for all of the following calculations." The authors indicated that the coherence length was estimated from the relation H (0) = Φ0/2¦L2 where Φ0 is the flux quantum and L is the coherence length.

Cautions: Evaluated Data
Coherence Length for Ba:11; [Ba(K)-Bi-O]
Temperature (K) Coherence Length (σ)
0 36.8
Measurement Method: Four-probe method
"ac resistivity was measured with the standard four-probe technique. Leads were attached to the sample with phosphor bronze positive pressure contact wires and silver paint. ac transverse magnetoresistance was measured in fields up to 8 T at temperatures down to 4 K with a measuring current of 0.1 mA at 17 Hz... the upper-critical-field phase diagram (was) obtained from both the magnetic and resistive measurements... Previous experiments in fields up to 8 T have not shown the concave downward behavior that is expected in H on the basis of WHH formalism. Therefore, a linear extrapolation consistent with the Ginzburg-Landau theory may be more appropriate. The corresponding critical field is H (0)=22.7 T which we used for all of the following calculations." The authors indicated that the coherence length was estimated from the relation H (0) = Φ0/2¦L2 where Φ0 is the flux quantum and L is the coherence length.

Cautions: Evaluated Data
Critical Flux Density Hc1 for Ba:11; [Ba(K)-Bi-O]
Temperature (K) Crit.Mag.Flux Density Hc1 (mT)
20 3.5
Measurement Method: SQUID magnetometer
"Magnetic measurements were performed in a custom-built superconducting quantum interference device (SQUID) magnetometer designed for very low fields and in a commerical Quantum Design SQUID magnetometer for high fields up to 5 T... H may be determined from the low-field regime of the magnetization curve where M(H) first deviates from linearity."

Cautions: Evaluated Data