Metamagnetism and Magnetocaloric Effect of LiPr(PO3)4 Crystal

Investigating the magnetic and magnetocaloric behaviors of LiSm(PO3)4

“…9, Δ T ad increases gradually when T decreases below 12 K. The maximum Δ T ad for LiSm(PO 3 ) 4 are about 4 and 5.8 K at 2 K, for applied fields of 10 and 20 kOe, respectively, which is higher than the maximum Δ T ad (∼2.8 K) of LiPr(PO 3 ) 4 (ref. 32) at the same conditions. For Li(Gd,Tb,Dy)(PO 3 ) 4 , they have fairly higher maximum Δ T ad values of 11.9–12.9 K at 2 K and H = 20 kOe.…”

“…This value is fairly smaller than the |Δ S m | values (9.8–27.6 J kg −1 K −1 , H = 50 kOe) obtained for Li(Gd,Tb,Dy,Pr)(PO 3 ) 4 single crystals. 27,32 It is reasonable because magnetic moment of Sm 3+ is lower than that of Gd 3+ , Tb 3+ , Dy 3+ , and Pr 3+ . 49 Considering |Δ S m ( H )| data at T = 2 K, we have found that these data could be described by a power law of y = a × H n , with a = 1.05 and n = 0.31.…”

“…Additionally, under the impacts of the crystal and magnetic fields, Kramers doublet on Sm 3+ ions could have more (2 J + 1)-fold degeneracy, leading to multiplets. 32 The jj -coupling and/or spin population on these multiplets could also cause short-range magnetic order in LiSm(PO 3 ) 4 .…”

“…Additionally, the ReO 8 and LiO 4 chains share their corners with the helical PO 4 chains that constitute a 3D framework. 31,32 Together with the 3D framework, a large nearest Re-Re distance (∼5.6 Å 31,33 ) is thought to obstruct exchange interactions between Re ions, leading to a large MC effect of LiRe(PO 3 ) 4 at low temperatures. Investigating LiRe(PO 3 ) 4 materials with Re = Gd, Tb, Dy and Pr, Petrov et al 27,32 found their jDS m j and DT ad values at 2 K are about 9.8-27.6 J kg −1 K −1 for the eld H = 50 kOe and 3-13 K for H = 20 kOe, respectively.…”