EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

Abstract

We combine neutron powder diffraction and x-ray single-crystal magnetic diffraction at the Eu L 2 edge to scrutinize the magnetic motif of the Eu ions in magnetoelectric EuTiO 3 . Our measurements are consistent with an antiferromagnetic G-type pattern with the Eu magnetic moments ordering along the a,b -plane diagonal. Recent reports of a novel transition at 2.75 K with a flop of magnetic moments upon poling the sample in an electric field cannot be confirmed for a nonpoled sample. Our neutron diffraction data do not show any significant change of the structure below the Néel temperature. Magnetoelastic coupling, if present, is therefore expected to be negligible.

Large adiabatic temperature and magnetic entropy changes inEuTiO3

“…In this context, EuTiO 3 is interesting since it has a divalent Eu ion with a large magnetic moment and a tetravalent Ti ion with no magnetic moment. EuTiO 3 , a G-type antiferromagnet below T N = 5.5 ± 0.2K [8,9], has attracted much attention in recent years due to the observations of a magnetodielectric effect in single crystals [10], tensile strain-induced ferromagnetism and ferroelectricity in thin films [11], and magnetoelastic properties [12,13]. It is also unique among the rare earth titanates (RTiO 3 , where R is the rare earth ion) because only the Eu 2+ ion adopts a divalent state instead of a trivalent state that is adopted by other rare earth ions (R = Gd,Y, etc.).…”

Structural control of magnetic anisotropy in a strain-driven multiferroic EuTiO3thin film

“…EuTiO 3 is isostructural with the cubic SrTiO 3 at room temperature with the lattice constant of 3.905 Å, and in the bulk EuTiO 3 is a quantum paraelectric with G-type antiferromagnetic order below T N ~ 5.4 K [20,21]. Neutron, x-ray, and specific heat measurements reveal that EuTiO 3 undergoes a structural phase transition around 282 K [22,23,24] from cubic to tetragonal involving TiO 6 octahedral distortion [23,24,25], which is predicted to affect magnetic and electronic properties of EuTiO 3 [26,27].…”

Evidence of a topological Hall effect in Eu1−xSmxTiO3

“…In its stoichiometric form, EuTiO3 is a quantum paraelectric with the cubic perovskite structure at room temperature, similar to SrTiO3 [11,12]. The Eu magnetic moments [4f 7 (S = 7/2)] order in a G-type antiferromagnetic pattern below the Neel temperature of 5.5 K [13][14][15]. Strained EuTiO3 films can become simultaneously ferromagnetic and ferroelectric at low temperatures [16].…”