Synthesis and structural properties of n= 1 Ruddlesden–Popper manganites Nd1−Ca1+MnO4

Effect of the oxygen deficiency on the physical properties of Ca2MnO4−δ compounds

“…The dramatic difference between the ZFC and FC curves suggests that magnetic moments of Mn 4+ ions order with a slight ferromagnetic component below Néel temperature. A similar M(T) plot was observed by Nagai et al for the same compound [26].…”

The crystal structure and electrical properties of K2NiF4-type (Ca2−Sm )MnO4

“…Castro-Couceiro et al [8] measured the dielectric response in (Ca 2Àx Pr x )MnO 4 and observed CO transitions at 275 K (x = 0.25), 330 K (x = 0.33), and 315 K (x = 0.50). According to Nagai et al [9], three distorted structures exist in Nd 1Àx Ca 1+x MnO 4 at room temperature: the orthorhombic Bmab structure (0.55 x 0.73), the orthorhombic Acam structure (0.73 x 0.85), and the tetragonal I4 1 /acd structure (0.85 x 1.00). The presence of the CO transition in Nd 1Àx Ca 1+x MnO 4 was indicated from the results of heat capacity and magnetization [9,10].…”

“…According to Nagai et al [9], three distorted structures exist in Nd 1Àx Ca 1+x MnO 4 at room temperature: the orthorhombic Bmab structure (0.55 x 0.73), the orthorhombic Acam structure (0.73 x 0.85), and the tetragonal I4 1 /acd structure (0.85 x 1.00). The presence of the CO transition in Nd 1Àx Ca 1+x MnO 4 was indicated from the results of heat capacity and magnetization [9,10]. Taguchi et al [11] measured the Hall coefficient of (Ca 2Àx Nd x )MnO 4 at room temperature.…”

“…This result suggested that the spin state of the Mn 3+ ions was high. Nagai et al[9] indicated the CO transition from superlattice reflections and the magnetization of Nd 1Àx Ca 1+x MnO 4 (0.55 x 0.75). The peak corresponding to the CO transition is observed at ca.…”

Role of the Tilting of Oxygen Octahedra in the Stabilization of the Orbital-Modulated State in the Layered Perovskite Manganite Ca₂_-<i>_x</i>Nd<i>_x</i>MnO₄

“…As a result of the e g -electron doping, the orbital-modulated (OM) state appears in CNMO with 0.23≤x≤0.60. The feature of the OM state is that it accompanies only a transverse lattice modulation as a Jahn-Teller distortion, which is a response of a lattice system to the orbital modulation [1][2][3].…”