Magneto-optic far-infrared study of Sr${}_{14}$Cu${}_{24}$O${}_{41}$: triplet excitations in chains

D. Hüvonen, U. Nagel, T. Rõõm +4

Using far-infrared spectroscopy we have studied the magnetic field and temperature dependence of the spin gap modes in the chains of Sr${}_{14}$Cu${}_{24}$O${}_{41}$. Two triplet modes T…