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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: Anomalous Temperature Dependence of H in YNi2B2C
Author(s): S.B. Roy, Z. Hossain, A.K. Pradhan, P. Chaddah, R. Nagarajan, and L.C. Gupta
Publication: Physica C Volume: 256 Issue: Not Available Year: 1996 Page(s): 90-94
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Flux Density Hc2, Coherence Length

Materials and Properties

[Y-Ni-B-C]
Material Specification for ; [Y-Ni-B-C] Process: Melt Processed
Notes: "The compounds YNi2B2C were prepared by melting high purity elements Y (99.9%), Ni (99.9%), B (99.8%) and C (99.7%) in an arc furnace under a protective atmosphere of flowing argon. Samples, sealed in quartz ampoules under vacuum, were annealed at 1050 °C for 12 h and cooled to room temperature over a period of 5 h."
Formula: YNi2B2C
Informal Name:
Chemical Family: Y-Ni-B-C
Chemical Class: Carbide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Flux Density Hc2 for ; [Y-Ni-B-C]
Temperature (K) Crit.Mag.Flux Density Hc2 (T)
6.2 5.1
7.7 4.0
8.8 3.5
9.8 3.0
11.3 2.1
12.3 1.5
13.3 1.0
14.3 0.5
15.1 0.1
Measurement Method: SQUID magnetometer
"For magnetisation measurements, we have used a SQUID magnetometer (Quantum Design MPMS 5). During the measurements we have used a scan length of 4 cm and averaged over 3 scans, each scan containing 32 data points. We have strictly adhered to the same sample position during the measurements. ... A typical M-T plot for YNi2B2C... (has a) considerable paramagnetic component (which gives a) peak in the susceptibility... We take the point of inflection in the M-T curve (which indicates the deviation from the concave character of the higher temperature magnetization) as the onset of superconducting transition. This occurs at temperatures 0.5 K to 0.75 K higher than T ... (The coherence length, L, was) obtained using the expression Hc2 = Φ0/2¦ L2."

Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.
Coherence Length for ; [Y-Ni-B-C]
Temperature (K) Coherence Length (σ)
6.2 2500
7.7 2900
8.7 3100
9.7 3300
11.3 4100
12.3 4700
13.3 5800
14.3 8100
Measurement Method: SQUID magnetometer
"For magnetisation measurements, we have used a SQUID magnetometer (Quantum Design MPMS 5). During the measurements we have used a scan length of 4 cm and averaged over 3 scans, each scan containing 32 data points. We have strictly adhered to the same sample position during the measurements. ... A typical M-T plot for YNi2B2C... (has a) considerable paramagnetic component (which gives a) peak in the susceptibility... We take the point of inflection in the M-T curve (which indicates the deviation from the concave character of the higher temperature magnetization) as the onset of superconducting transition. This occurs at temperatures 0.5 K to 0.75 K higher than T ... (The coherence length, L, was) obtained using the expression Hc2 = Φ0/2¦ L2."

Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.