Mapping Pressure- and Temperature-Induced Structural and Magnetic Transitions in Perovskite PrNiO3 with Local and Long-Range Probes
The RNiO<inf>3</inf> nickelate perovskites represent a promising class of materials for spintronics applications such as in modern communication devices. This is related to the large diversity of properties shown by these compounds. Indeed, depending on the external parameters, such as t...
| Autores: | , , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/396015 |
| Acceso en línea: | http://hdl.handle.net/10261/396015 https://api.elsevier.com/content/abstract/scopus_id/85181007896 |
| Access Level: | acceso abierto |
| Palabra clave: | Cations Diffraction Energy Phase transitions X-ray absorption near edge spectroscopy |
| Sumario: | The RNiO<inf>3</inf> nickelate perovskites represent a promising class of materials for spintronics applications such as in modern communication devices. This is related to the large diversity of properties shown by these compounds. Indeed, depending on the external parameters, such as temperature, pressure, or R cation size, they can exhibit para- or antiferromagnetic behavior and can transform from an insulator to a metal. Among them, PrNiO<inf>3</inf> is one of the most important members because it exhibits tunable electronic and magnetic properties. However, our understanding of how these properties can be modified through external parameters, such as pressure and temperature, remains under debate. In this work, we characterized the structural, electronic, and magnetic properties of PrNiO<inf>3</inf> in the range of 0-21 GPa and 10-973 K. For this purpose, we performed synchrotron X-ray diffraction (SXRD), X-ray absorption near-edge structure spectroscopy (XANES), and magnetic measurements. We compared the experimental XANES data with ab initio calculations to extract information about the electronic structure. The diffraction data demonstrated a sharp transition at the bulk level between monoclinic and orthorhombic PrNiO<inf>3</inf> (P2<inf>1</inf>/n → Pbnm) at T<inf>IM</inf> ∼ 130 K, while XANES data, which probe the medium-range and electronic structure, showed progressive changes between 90 and 130 K. The latter is in accordance with our previous EXAFS data, attesting that this transition occurs around 130 K and that it is driven at the local and medium-range scales. Between 700 and 800 K at ambient pressure, the Pbnm phase transforms into a rhombohedral phase (R3̅c), in agreement with a previous laboratory X-ray diffraction study. Our XANES data and ab initio simulations across this transition indicate a significant raising of the orbital overlap between Ni 3d and O 2p, suggesting superior electronic properties of the rhombohedral phase compared to the orthorhombic structure. Under isothermal cold compression, we found that the Pbnm to R3̅c transition is characterized by a large coexisting domain between 5.8 and 12.2 GPa. Based on the present and literature data, we proposed an extended pressure- and temperature-phase diagram of PrNiO<inf>3</inf> and provided first-order constraints on the interplay between external parameters and properties in nickelates. |
|---|