Investigation of Precursor Superconducting State in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ through In-plane Optical Spectroscopy

Kegan Lee, Keisuke Kamiya, Masamichi Nakajima +2

A precursor of superconductivity has been searched in the in-plane optical spectra of underdoped YBa${}_2$Cu${}_3$O${}_y$, in which the previous $c$-axis optical spectra showed the prese…