Existence of short-range magnetic correlation and observation of large magnetocaloric effect in BiGdO3 compound

Anomalous structural behavior and antiferroelectricity in BiGdO3: detailed temperature and high-pressure study

“…In a recent study, Saha et al suggested dielectric relaxation and antiferromagnetic interaction in BiGdO 3 (BG) [27]. In our earlier study on this system, we have established absence of long-range magnetic ordering down to 2 K and presence of a possible weak short-range antiferromagnetic correlation below 40 K [28]. However, as per authors knowledge no detailed study on structural and electronic properties of this material is available in literature.…”

“…This same mechanism is applicable for reorientation of polarization at T r . At this point, it is noteworthy that no structural transition has been observed in low temperature XRD study down to 15 K [28]. Seshadri and Hill reported that ferroelectricity and highly distorted monoclinic structure in BiMnO 3 arises due to lone pair activity [25].…”

“…Polycrystalline BG sample is synthesized using conventional solid-state reaction method [28]. Temperature dependent dielectric constant measurements are carried out on sintered BG pellets of 8 mm dia and 2 mm thickness after polishing both the faces of the pellets with 0.25 μm silver paste.…”

Magnetism and giant magnetocaloric effect in rare-earth-based compounds R 3BWO9 (R = Gd, Dy, Ho)*

“…Similar with GdCrTiO 5 and BiGdO 3 , such behaviors indicate the existence of short-range spin correlations at low temperature in this system. [25,29] The background specific heat of phonon contribution can be described by C ph = β T 3 + β 5 T 5 + β 7 T 7 with β = 112 × 10 −3 J/mol•K 4 , β 5 = −4.66 × 10 −7 J/mol•K 6 , β 7 = 7.40 × 10 −11 J/mol•K 8 . By integrating (C p − C ph )/T from 50 K to 2 K, the temperature dependence of the magnetic entropy is obtained and shown in Fig.…”

“…The typical examples include intermetallics Gd 3 Ru, [14] perovskite oxide GdFe 0.5 Cr 0.5 O 3 , [15] molecular-based complex [Mn III 4 Gd III 4 ]Calix [4]arene, [16] frustrated antiferromagnet SrGd 2 O 4 , [17] 4f-3d spin system GdCrTeO 6 , [18] amorphous alloy Gd 60 Ni 37 Co 3 and Gd 50 Co 50 , [19,20] etc. [21][22][23][24][25][26] Recently, the rare-earth-based systems R 3 BWO 9 (R = Gd, Dy, Ho) have attracted attention as searching for quantum spin liquid candidates. [27] These compounds crystallize in hexagonal structure with the space group P6 3 , where the magnetic ions are connected by oxygen ions and form a distorted Kagome lattice in the ab plane.…”