Study of pressure effect on the magnetic penetration depth in MgB${}_2$

Abstract

A study of the pressure effect on the magnetic penetration depth $\lambda$ in polycrystalline MgB${}_2$ was performed by measuring the temperature dependence of the magnetization under an applied pressure of 0.15 and 1.13 GPa. We found that ${\lambda }^{-2}$ at low temperature is only slightly affected by pressure [$\frac{\Delta {\lambda }^{-2}}{{\lambda }^{-2}}=1.5(9)$], in contrast to cuprate superconductors, where, in the same range of pressure, a very large effect on ${\lambda }^{-2}$ was found. Theoretical estimates indicate that most of the pressure effect on ${\lambda }^{-2}$ in MgB${}_2$ arises from the electron-phonon interaction.

5 pages, 2 figures

References in corpus (13)

• Direct evidence for two-band superconductivity in MgB_2 single crystals from directional point-contact spectroscopy in magnetic fields
• Direct observation of the oxygen isotope effect on the in-plane magnetic field penetration depth in optimally doped YBa${}_2$Cu${}_3$O${}_{7-\delta }$
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Cited by in corpus (6)

• Tuning topological disorder in MgB${}_2$
• Anomalous electron-phonon coupling probed on the surface of ZrB${}_{12}$ superconductor
• Strong enhancement of conventional superconductivity near a quantum critical point of (Ca,Sr)_3Ir_4Sn_13
• Unconventional pressure dependence of the superfluid density in the nodeless topological superconductor $\alpha$-PdBi${}_2$
• Detailed magnetization study of superconducting properties of YBCO ceramic spheres
• Probing superconductivity in MgB2 confined to magnetic field tuned cylinders by means of critical fluctuations