Two-Peak Heat Capacity Accounts for $R\ln (2)$ Entropy and Ground State Access in the Dipole-Octupole Pyrochlore Ce${}_2$Hf${}_2$O${}_7$

E. M. Smith, A. Fitterman, R. Schäfer +18

Magnetic heat capacity measurements of a high-quality single crystal of the dipole-octupole pyrochlore Ce${}_2$Hf${}_2$O${}_7$ down to a temperature of $T=0.02$ K are reported. These s…