Multiple caloric effects in geometrically frustrated “114” CaBaCo4O7 Cobaltite

Magnetocaloric properties and Griffiths phase of ferrimagnetic cobaltite CaBaCo4O7

“…[27] ∆S M (J/kgSK) Dhanasekhar et al reported that the magnetic entropy change of a polycrystalline CBCO sample sintered under various conditions has different values. [16] Compared to the previous report with the decrease in sintering time, a broad peak in magnetic entropy change with the width of half maximum of ∆S-T curve about 14 K is observed in our case. Reduced sintering time contributes to increased porosity.…”

“…7. The large value of RCP obtained for the sample compared to that reported by Dhanasekhar et al [16] because of the border peak can be used to demonstrate the crossover of the first-order to second-order magnetic phase transition, as well as the effect of the preparation condition method. The results give new aspects of the properties of CBCO as potential candidates for such applications.…”

“…The variation in annealing time in the process of preparing our sample compared to the work of Dhansekhar et al could explain the decrease in volume cell and observation of inhomogeneity (extra peak) in XRD. [14][15][16]…”

“…The value of T C is evaluated to be 60 K, which is close to other reports. [16,17] One of the principal capabilities of the CBCO compound is that the structural distortion lifts exchange-interaction frustration which leads to the unique geometry of the kagome lattice. The exchange interaction in the system would be influenced by the precise Co 3+ /Co 2+ = 1 ratio, resulting in the appearance of the FIM ordering.…”

Structural, magnetic and electric-polarization properties of geometrically frustrated YBaCo4O7and DyBaCo4O7cobaltites

“…Experiment details. -The DyBaCo 4 O 7+δ (DBCO) and YBaCo 4 O 7+δ (YBCO) samples were synthesized by the solid-state reaction method following a procedure as reported previously [22,23]. Both powders of YBaCo 4 O 7 and DyBaCo 4 O 7 were obtained through a two-step solidstate reaction method starting from stoichiometric highpurity amounts of Y 2 O 3 , Dy 2 O 3 , BaCO 3 , and Co 3 O 4 .…”