M. Núñez-Regueiro

Pressure-Induced Enhancement of Tc Above 150 K in Hg-1223

The recently discovered homologous series HgBa2Can-1 Cun O2n+2+δ possesses remarkable properties. A superconducting transition temperature, Tc, as high as 133 kelvin has been measured in a multiphase Hg-Ba-Ca-Cu-O sample and found to be attributable to the Hg-1223 compound. Temperature-dependent electrical resistivity measurements under pressure on a (> 95%) pure Hg-1223 phase are reported. These data show that Tc increases steadily with pressure at a rate of about 1 kelvin per gigapascal up to 15 gigapascals, then more slowly and reaches a Tc = 150 kelvin, with the onset of the transition at 157 kelvin, for 23.5 gigapascals. This large pressure variation (as compared to the small effects observed in similar compounds with the optimal Tc) strongly suggests that higher critical temperatures could be obtained at atmospheric pressure.

Absence of a structural transition up to 40 GPa in MgB 2 and the relevance of magnesium nonstoichiometry

We report measurements on

High-pressure effects in fluorinated HgBa2Ca2Cu3O8 + δ

{\mathrm{MgB}}_{2}

Direct observation of the influence of the As-Fe-As angle on the Tc of superconducting SmFeAsO1−x Fx

up to

50 K enhancement of Tc by pressure in the Hg-2212 superconductor

\ensuremath{\sim}40 \mathrm{GPa}.

Quantum critical point and superconducting dome in the pressure phase diagram ofo-TaS3

Increasing pressure yields a monotonous decrease of the lattice parameters and of the

Effect of the isoelectronic substitution of Sb for As on the magnetic and structural properties of LaFe(As1−xSbx)O

c/a

Direct observation of the influence of the FeAs4 tetrahedron on superconductivity and antiferromagnetic correlations in Sr2VO3FeAs

ratio, but no structural transition down to parameters smaller than those of

High magnetic field study of quasi-stoichiometric Li1-xNi1+xO2

{\mathrm{AlB}}_{2}.

Large enhancement of Tc (50K) by applying high pressure in the Hg-2212 superconductor

The transition superconducting temperature also decreases with temperature in a sample-dependent way. The results are explained by an increase of the filling of the two-dimensional