High Pressure Studies of Tc and Lattice Parameters of MgB2

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dc.creatorSchlachter, S. I.
dc.creatorFietz, W. H.
dc.creatorGrube, K.
dc.creatorGoldacker, W.
dc.date2001-07-10
dc.date2001-08-27
dc.date.accessioned2026-07-25T14:26:42Z
dc.descriptionWe performed ac-susceptibility measurements of magnesium diboride powder samples under pure hydrostatic pressures up to 0.4 GPa and under quasi-hydrostatic pressure conditions up to 8 GPa in a helium gas pressure cell and a diamond-anvil cell (DAC), respectively. Furthermore, the DAC has been used to investigate the lattice compression by X-ray diffraction. Under helium gas pressure the superconducting transition temperature shows a linear decrease dTc/dp = -1.13 K/GPa. The pressure effect is fully reversible with a return to the initial Tc of 37.5 K after pressure release. In the diamond-anvil cell the application of pressure leads to a stronger Tc-decrease than in the helium gas pressure cell, and after the release of pressure a degradation effect with lower Tc and a broader transition compared to the first measurement at ambient pressure occurs. Such degradation may be explained by shear stresses and uniaxial pressure components, which cannot be avoided in a DAC at low temperatures. Considering the anisotropic AlB2-type structure with alternating honeycomb boron and magnesium layers, MgB2 seems to be very sensitive to such non-hydrostatic pressure components, which would explain the spread of dTc/dp values reported in the literature.
dc.description8 pages, 7 figures, minor corrections added. Accepted for publication in 'Advances in Cryogenic Engeneering' (proceedings of ICMC'01, Madison July 16-20, 2001)
dc.identifierhttps://arxiv.org/abs/cond-mat/0107205
dc.identifierhttp://arxiv.org/abs/cond-mat/0107205
dc.identifierAdvances in Cryogenic Engineering: Proceedings of the International Cryogenic Materials Conference - ICMC, Vol. 48 (2002) 809
dc.identifier.urihttps://dspace.dare.co.zw/handle/123456789/25710
dc.subjectSuperconductivity
dc.titleHigh Pressure Studies of Tc and Lattice Parameters of MgB2
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