Selective Spin-State Switch and Metal-Insulator Transition in \boldmath $\mathrm{GdBaC}{\mathrm{o}}_2{\mathrm{O}}_{5.5}$

C. Frontera, J. L. García-Muñoz, A. Llobet +1

Ultra-high resolution synchrotron diffraction data for $\mathrm{GdBaC}{\mathrm{o}}_2{\mathrm{O}}_{5.5}$ throw new light on the metal-insulator transition of Co${}^{3+}$ Ba-cobaltites. An anomalous expansion of…