Fig. 3: Giant enhancement in magnetocaloric effect with two spin–liquid coolants YbAlO3 (YAO) and Na2BaCo(PO4)2 (NBCP).
From: Quantum spin liquid candidate as superior refrigerant in cascade demagnetization cooling
a, d show the entropy curves of YAO and NBCP, as well as the ADR salt Ce2Mg3(NO3)12 ⋅ 24H2O (CMN), under the peak field Bi = 4 T and the critical field around 1 T, respectively. The entropy change enhancement ΛSM is also indicated. b, e We show ΛSM of salts CMN and CrK(SO4)2 ⋅ 12H2O, due to the combination with the spin-liquid coolants YAO and NBCP, at various base temperature Ti. The insets illustrate the spin-chain and triangular-lattice structures for both YAO and NBCP compounds. c, f show, respectively, the increment rates of two spin-liquid coolants at various working temperatures Tw, when combined with CMN (from base Ti = 1.5 K) and CPA (Ti = 3 K).
