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We investigate the pressure and temperature dependence of the latticedynamics of the underdoped, stoichiometric, high temperature superconductorYBa2Cu4O8 by means of Raman spectroscopy and ab initio calculations. Thissystem undergoes a reversible pressure-induced structural phase transitionaround 10 GPa to a collapsed orthorhombic structure, that is well reproduced bythe calculation. The coupling of the B1g-like buckling phonon mode to theelectronic continuum is used to probe superconductivity. In the low pressurephase, self-energy effects through the superconducting transition renormalizethis phonon, and the amplitude of this renormalization strongly increases withpressure. Whereas our calculation indicates that this mode's coupling to theelectronic system is only marginally affected by the structural phasetransition, the aforementioned renormalization is completely suppressed in thehigh pressure phase, demonstrating that under hydrostatic pressures higher than10 GPa, superconductivity in YBa2Cu4O8 is greatly weakened or obliterated.

Pressure-induced phase transition and superconductivity in YBa2Cu4O8