2004/11/29 by D. Di Castro, R. Khasanov, Claudio Grimaldi +7
Materials Science · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #Thermal Expansion and Ionic Conductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.72.094504
published as Phys. Rev. B 72, 094504 (2005) · 5 pages, 2 figures
arxiv created 2004/11/29 · openalex publication_date 2005/09/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A study of the pressure effect on the magnetic penetration depth \ensuremathλ in polycrystalline MgB2 was performed by measuring the temperature dependence of the magnetization under an applied pressure of 0.15 and 1.13\phantom\rule0.3em0exGPa. We found that \ensuremathλ^\ensuremath-2 at low temperature is only slightly affected by pressure [\ensuremathΔ\ensuremathλ^\ensuremath-2∕\ensuremathλ^\ensuremath-2=3.1(9)%], in contrast to cuprate superconductors, where, in the same range of pressure, a very large effect on \ensuremathλ^\ensuremath-2 was found. Theoretical estimates indicate that most of the pressure effect on \ensuremathλ^\ensuremath-2 in MgB2 arises from the electron-phonon interaction.