Cs₂NaAl_1-xCr_x F₆: A family of compounds presenting magnetocaloric effect

TY - JOUR

T1 - Cs2NaAl1-xCrx F6

T2 - A family of compounds presenting magnetocaloric effect

AU - Pedro, S.S.

AU - Guimaraes Tedesco, Julio Cesar

AU - Yokaichiya, F.

AU - Brandão, P.

AU - Gomes, A.M.

AU - Landsgesell, S.

AU - Pires, M.J.M.

AU - Sosman, L.P.

AU - Mansanares, A.M.

AU - Reis, M.S.

AU - Nunes Bordallo, Heloisa

PY - 2014/8/7

Y1 - 2014/8/7

N2 - In this paper we explore the magnetocaloric effect (MCE) of chromium-doped elpasolite Cs2NaAl1-xCrxF6 (x=0.01 and 0.62) single crystals. Magnetization and heat capacity data show the magnetocaloric potentials to be comparable to those of garnets, perovskites, and other fluorides, producing magnetic entropy changes of 0.5 J/kg K (x=0.01) and 11 J/kg K (x=0.62), and corresponding adiabatic temperature changes of 4 and 8 K, respectively. These values are for a magnetic field change of 50 kOe at a temperature around 3 K. A clear Schottky anomaly below 10 K, which becomes more apparent when an external magnetic field is applied, was observed and related to the splitting of the Cr3+ energy levels. These results hint at a new family of materials with potential wide use in cryorefrigeration.

AB - In this paper we explore the magnetocaloric effect (MCE) of chromium-doped elpasolite Cs2NaAl1-xCrxF6 (x=0.01 and 0.62) single crystals. Magnetization and heat capacity data show the magnetocaloric potentials to be comparable to those of garnets, perovskites, and other fluorides, producing magnetic entropy changes of 0.5 J/kg K (x=0.01) and 11 J/kg K (x=0.62), and corresponding adiabatic temperature changes of 4 and 8 K, respectively. These values are for a magnetic field change of 50 kOe at a temperature around 3 K. A clear Schottky anomaly below 10 K, which becomes more apparent when an external magnetic field is applied, was observed and related to the splitting of the Cr3+ energy levels. These results hint at a new family of materials with potential wide use in cryorefrigeration.

M3 - Journal article

SN - 2469-9950

VL - 90

JO - Physical Review B

JF - Physical Review B

IS - 6

M1 - 064407

ER -