High Pressure Studies of Tc and Lattice Parameters of MgB2

Details High Pressure Studies of Tc and Lattice Parameters of MgB2 High Pressure Studies of Tc and Lattice Parameters of MgB2

2001-07-10

arxiv.org/abs/cond-mat/0107205v2

Advances in Cryogenic Engineering: Proceedings of the International Cryogenic Materials Conference - ICMC, Vol. 48 (2002) 809

Physics

Condensed Matter

Superconductivity

8 pages, 7 figures, minor corrections added. Accepted for publication in 'Advances in Cryogenic Engeneering' (proceedings of I

Scientific paper

We 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.

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