Heat capacity studies of phase transitions in langbeinites II. K2Mg2(SO4)3

Abstract

Abstract. Heat capacity measurements have been made on a synthetic sample of langbeinite, KzMgz(SO4)a, from 13 to 342 K in an adiabatic calorimeter. Three phase transitions, at 51.0, 54.9 and 63.8 K, have been observed in this material. Our study is the first to report the existence of such phase transitions in K2Mgz(SO4)3 and disputes predictions that none would take place below 77 K. Two models which have been proposed to explain the transition in potassium langbeinites are discussed in light of these results.

Magnetic field induced quantum spin liquid in the two coupled trillium lattices of K$_2$Ni$_2$(SO$_4$)$_3$

“…To extract the magnetic specific heat C m , the phonon contribution using the data obtained on K 2 Mg 2 (SO 4 ) 3 has been subtracted. On the high T side the subtraction works up to 50 K where K 2 Mg 2 (SO 4 ) 3 shows a kink [15], associated to previously observed lattice related features in the heat capacity [19]. On the low T side a polynomial BT 3 + CT 5 has been used [15].…”

Magnetic Field Induced Quantum Spin Liquid in the Two Coupled Trillium Lattices of K2Ni2(SOŽivković1, Favre2, Mejía3 et al. 2021Phys. Rev. Lett.23040View full textAdd to dashboardCite

“…To extract the magnetic specific heat C m , the phonon contribution using the data obtained on K 2 Mg 2 ðSO 4 Þ 3 has been subtracted. On the high T side the subtraction works up to 50 K, where K 2 Mg 2 ðSO 4 Þ 3 shows a kink [15] associated with previously observed lattice related features in the heat capacity [29]. On the low T side, a polynomial BT 3 þ CT 5 has been used [15].…”