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Comment on “Superconducting state of Ca-VII below a critical temperature of 29 K at a pressure of 216 GPa”
KTH, School of Information and Communication Technology (ICT), Material Physics, Material Physics, MF.ORCID iD: 0000-0002-9858-6235
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 21Article in journal (Refereed) Published
Abstract [en]

In a recent paper, Sakata et al. [ Phys. Rev. B 83 220512 (2011)] report on superconductivity at 29 K in Ca under high pressure. Here, I argue that their method to define the onset of the superconducting transition temperature from resistivity measurements is misleading and that the correct value for the onset of the transition based on resistivity data shown in their paper should be 21 K. The discrepancy between these two temperatures is explained by superconducting fluctuations occurring at temperatures above the superconducting transition temperature.

Place, publisher, year, edition, pages
2011. Vol. 84, no 21
National Category
Condensed Matter Physics
URN: urn:nbn:se:kth:diva-50710DOI: 10.1103/PhysRevB.84.216501ISI: 000297762300008ScopusID: 2-s2.0-84855297339OAI: diva2:462431
QC 20111209Available from: 2011-12-07 Created: 2011-12-07 Last updated: 2011-12-09Bibliographically approved

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