Low-temperature specific heat of isotopically modified boron single crystals

Abstract

The measurement of specific heat at low temperature for isotopically modified boron single crystals was performed between 0.5 and 100 K using a calorimetric technique known as the time-constant or relaxation method. The results indicate that the specific heat has obvious divergencies at 1.3 K<T<5 K and the divergencies for four kinds of isotopically modified boron samples vary with different B10 contents. The influence of lattice vibration modes and the isotopic effect on specific heat and thermal conductivity for isotopically modified boron are discussed.