s-wave superconductivity probed by measuring magnetic penetration depth and lower critical field of MgCNi3 single crystals
P. Diener, P. Rodière, T. Klein, C. Marcenat, J. Kacmarcik, Z. Pribulova, D. J. Jang, H. S. Lee, H. G. Lee, S. I. Lee
DOI 10.1103/PhysRevB.79.220508 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The magnetic penetration depth λ has been measured in MgCNi3 single crystals using both a high-precision tunnel diode oscillator (TDO) technique and Hall probe magnetization (HPM). In striking contrast to previous measurements in powders, δλ(T) deduced from TDO measurements increases exponentially at low temperature, clearly showing that the superconducting gap is fully open over the whole Fermi surface. An absolute value at zero temperature λ(0)=230 nm is found from the lower critical field measured by HPM. We also discuss the observed difference of the superfluid density deduced from both techniques. A possible explanation could be due to a systematic decrease in the critical temperature at the sample surface.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.9 | Pressure not reported | onset |
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.6 | Pressure not reported | onset |
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.9 | Pressure not reported | unknown |
| MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.6 | Pressure not reported | unknown |
Similar papers
S-wave superconductivity probed by measuring magnetic penetration depth and lower critical field of MgCNi single crystals
similarity 0.97P. Diener et al. · 2013 · arXiv:1301.1879
Source status unknown — claims are unverified
Competition between BCS superconductivity and ferromagnetic spin fluctuations in MgCNi3
similarity 0.96L. Shan et al.
Source status unknown — claims are unverified
BCS-like superconductivity in MgCNi3
similarity 0.96J.-Y. Lin et al.
Source status unknown — claims are unverified
Superconducting energy gap in MgCNi3 single crystals: Point-contact spectroscopy and specific-heat measurements
similarity 0.95Z. Pribulová et al.
Source status unknown — claims are unverified
Phonon dispersions and anomalies of MgCNi3 single-crystal superconductors determined by inelastic x-ray scattering
similarity 0.95Hawoong Hong et al.
Source status unknown — claims are unverified
Evidence for unconventional superconductivity in the nonoxide perovskite MgCNi3 from penetration depth measurements
similarity 0.95R. Prozorov et al.
Source status unknown — claims are unverified