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With Terahertz and Infrared spectroscopy we studied the in-plane response ofan underdoped YBa2Cu3O6.6 single crystal with Tc=58(1) K in high magneticfields up to B=30 Tesla applied along the c-axis. Our goal was to investigatethe field-induced suppression of superconductivity and to observe thesignatures of the three dimensional (3d) incommensurate copper charge densitywave (Cu-CDW) which was previously shown to develop at such high magneticfields. Our study confirms that a B-field in excess of 20 Tesla gives rise to afull suppression of the macroscopic response of the superconducting condensate.However, it reveals surprisingly weak signatures of the 3d Cu-CDW at highmagnetic fields. At 30 Tesla there is only a weak reduction of the spectralweight of the Drude-response (by about 3%) that is accompanied by anenhancement of two narrow electronic modes around 90 and 240 cm-1, that areinterpreted in terms of pinned phase modes of the CDW along the a- andb-direction, respectively, and of the so-called mid-infrared (MIR) band. Thepinned phased modes and the MIR band are strong features already withoutmagnetic field which suggests that prominent but short-ranged and slowlyfluctuating (compared to the picosecond IR-time scale) CDW correlations existall along, i.e., even at zero magnetic field.

Infrared spectroscopy study of the in-plane response of YBa2Cu3O6.6 in magnetic fields up to 30 Tesla