Structural, magnetic and electrical properties of a perovskite containing divalent europium EuZrO3

Strong Spin‐Lattice Coupling Through Oxygen Octahedral Rotation in Divalent Europium Perovskites

“…We begin with reviewing fundamental properties of the Eu 2+ perovskites including structural, magnetic, and optical properties investigated experimentally and theoretically so far. EuTiO 3 has a cubic $ Pm{\bar 3}m $ structure at room temperature, while EuZrO 3 and EuHfO 3 have orthorhombic Pbnm structures 12, 21, 46–48. As for EuTiO 3 , the occurrence of antiferrodistortive transition from cubic $ Pm{\bar 3}m $ to tetragonal I 4 / mcm structure has been recently indicated by a specific heat measurement,41 variable‐temperature powder X‐ray diffraction,42, 43 electron diffraction,43 and first‐principles calculations 44, 45.…”

“…Powder neutron diffraction study indicates that EuTiO 3 has a G ‐type magnetic configuration below T N 49. Negative values of J 1 and positive values of J 2 are derived from Weiss temperature, θ W , and Néel temperature, T N , based on the molecular‐field theory 12, 21, 47, 48. For tetragonal EuTiO 3 and orthorhombic EuZrO 3 and EuHfO 3 as well as cubic EuTiO 3 , the calculated total‐energy differences between G ‐ and F ‐type magnetic configurations, E G – E F [=2| S | 2 (24 J 1 +32 J 3 )], which correspond to an inter‐sublattice interaction in the G ‐type AFM configuration (see the arrows in Figure 1a), are plotted as a function of cell volume in Figure a.…”

Magnetodielectric effect in EuZrO3

“…Until recently, EuZrO 3 was considered paramagnetic with a cubic ͑space group Pm3m͒ perovskite structure. 7 Recently Viallet et al 8 and Zong et al 9 have revised the crystal structure of EuZrO 3 and found that it crystallizes in orthorhombic ͑space group Pbnm͒ symmetry similar to that of SrZrO 3 . Most importantly, Zong et al 9 found that EuZrO 3 develops an antiferromagnetic ͑AFM͒ ordering below T N Ϸ 4.1 K. Although direct confirmation of the type of the AFM structure in EuZrO 3 has yet to be provided by neutron diffraction, the indirect evidence indicates that EuZrO 3 and EuTiO 3 are magnetically very similar.…”

Ferromagnetic properties with reentrant spin‐glass behavior in amorphous EuZrO3 thin film

“…From a point of view of application, the achievement of ferromagnetism via amorphization sheds a light on the development of ferromagnets that can be fabricated at low cost. An analogue to crystalline EuTiO 3 is crystalline EuZrO 3 which has similar crystal structure to the former [12,13]. Although crystalline EuZrO 3 behaves as an antiferromagnet, the value of θ W was estimated to be positive, 0.07 K [13], which indicates that the ferromagnetic interactions are predominant.…”