Physics – Condensed Matter – Superconductivity
Scientific paper
2011-05-10
Phys. Rev. B 83, 220517(R) (2011)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.83.220517
A new NMR anvil cell design is used for measuring the influence of high pressure on the electronic properties of the high-temperature superconductor YBa$_2$Cu$_4$O$_8$ above the superconducting transition temperature $T_{\rm c}$. It is found that pressure increases the spin shift at all temperatures in such a way that the pseudo-gap feature has almost disappeared at 63 kbar. This change of the temperature dependent spin susceptibility can be explained by a pressure induced proportional decrease (factor of two) of a temperature dependent component, and an increase (factor of 9) of a temperature independent component, contrary to the effects of increasing doping. The results demonstrate that one can use anvil cell NMR to investigate the tuning of the electronic properties of correlated electronic materials with pressure.
Goh Swee K.
Haase Jürgen
Littlewood Peter B.
Meissner Thomas
Williams Grant V. M.
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