Magnetic and electronic properties of RNiO₃(R = Pr, Nd, Eu, Ho and Y) perovskites studied by resonant soft x-ray magnetic powder diffraction

Abstract

Soft x-ray resonant magnetic powder diffraction of the ([Formula: see text]) reflection at the Ni L(2, 3) edges is used to study the magnetic and electronic properties of a series of RNiO(3) materials (with R = Pr, Nd, Eu, Ho and Y) below the metal-insulator transition. The polarization and energy dependence of the reflection gives further support for a non-collinear magnetic structure and charge disproportionation in the whole RNiO(3) series. Only small changes in the spectra of the magnetic ([Formula: see text]) reflection and in the absorption spectra could be detected. The results are discussed with comparison to charge transfer multiplet calculations. Our results emphasize that the lighter and heavier RNiO(3) compounds are very similar from the point of view of their local electronic and magnetic state despite the strong change of the metal-to-insulator transition temperature.

Charge order and antiferromagnetism in epitaxial ultrathin films ofEuNiO3

“…Previous studies by several groups, including our recent work on NNO, have shown the E -type AFM order in the nickelates is very robust and likely plays a significant role in the MIT transition in the less distorted nickelates 19,29,30,38 . In ENO, however, the separation of the MIT and the AFM transitions is nearly 300 K allowing independent investigation of each.…”

“…This class of materials has received significant attention recently due to the MIT 17 , E -type anti-ferromagnetic transition (AFM) 19 , structural transition 17 , predicted high T c superconductivity 20 , potential for device applications 6,7,21 , and the charge-ordering transition [22][23][24][25][26] . The charge ordering transition, in particular, a) Electronic mail: dmeyers@email.uark.edu has been a source of controversy and still requires further insight [27][28][29][30] .…”

Novel Electronic Behavior DrivingNdNiO3Metal-Insulator Transition

“…It has been determined, however, that it is energetically favorable to transfer partial hole from the Ni to the hybridized Ni-O bond. Thus, the ground state is generally described as mixture of |3d 7 2p 6 〉 and |3d 8 L〉, where L is the ligand hole [17,18,19] [20]. The L consists of pz or px,y orbitals [21].…”

Complete phase diagram of rare-earth nickelates from first-principles

“…¼ ð Þ with respect to the Pbnm primitive 20-atom unit cell) and possible collinear or non collinear spin orderings. [12][13][14][15][16] The electronic structure is also characterized by strong overlaps between O-2p and Ni-3d states inducing large covalent effects. 2 As a consequence, external stimuli, such as temperature, or chemical or hydrostatic pressure, can modify the electronic bandwidth and influence the MIT.…”