Magnetocapacitance and spin fluctuations in the geometrically frustrated magnetsR2Ti2O7(R=rareearth)

Abstract

Magnetocapacitance has been measured for the geometrically frustrated magnets ${R}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ $(R=\mathrm{rare}\mathrm{}\mathrm{earth}).$ The temperature dependence of magnetocapacitance, which largely deviates from the square of magnetization, indicates the evolution of strong ferromagnetic $(R=\mathrm{Ho})$ or antiferromagnetic $(R=\mathrm{Gd})$ fluctuation at low temperatures. This result demonstrates that the measurement of mangetocapacitance is a powerful technique to detect the magnetic fluctuation of exotic magnets.