Local electronic properties of La3Ni2O7 under pressure

The recent discovery of superconductivity in \(\rm La_3Ni_2O_7\) has attracted significant attention due to its high critical temperature and analogy to cuprate oxides. The oxidation and spin states of Ni ions are among the most important local properties in this compound, extensively discussed in t...

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Hauptverfasser: Mijit, Emin, Ma, Peiyue, Sahle, Christoph J, Rosa, Angelika D, Hu, Zhiwei, De Angelis, Francesco, Lopez, Alberto, Amatori, Simone, Tchoudinov, Georghii, Joly, Yves, Irifune, Tetsuo, Joao Elias F S Rodrigues, Garbarino, Gaston, Samuel Gallego Parra, Wang, Meng, Yu, Runze, Mathon, Olivier
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container_title arXiv.org
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creator Mijit, Emin
Ma, Peiyue
Sahle, Christoph J
Rosa, Angelika D
Hu, Zhiwei
De Angelis, Francesco
Lopez, Alberto
Amatori, Simone
Tchoudinov, Georghii
Joly, Yves
Irifune, Tetsuo
Joao Elias F S Rodrigues
Garbarino, Gaston
Samuel Gallego Parra
Wang, Meng
Yu, Runze
Mathon, Olivier
description The recent discovery of superconductivity in \(\rm La_3Ni_2O_7\) has attracted significant attention due to its high critical temperature and analogy to cuprate oxides. The oxidation and spin states of Ni ions are among the most important local properties in this compound, extensively discussed in the context of its superconductivity. Despite their direct link to the electron filling configurations of the relevant \(\rm 3d_{x^2-y^2}\) and \(\rm 3d_{z^2}\) orbitals, these local electronic properties of \(\rm La_3Ni_2O_7\) yet to be systematically investigated. In this work, we address this issue using x-ray absorption spectroscopy (XAS) and x-ray emission spectroscopy (XES) measurements under pressure. Comparison of Ni \textit{K}-edge XAS and \(\rm K\beta\) XES with the reference spectra of \(\rm NiO\) and \(\rm LaNiO_3\) shows that Ni ions, with an average valence of \(\sim 2.53+\), are in a low-spin (\(\rm S = 1/2\)) ground state under ambient conditions. High pressure XAS and XES data clearly show that the oxidation (\(\sim 2.5+\)) and spin (\(\rm S = 1/2\)) states of Ni ions remain stable across the investigated pressure (up to 30 GPa) and temperature (down to 10 K) ranges, ruling out previously proposed spin transition scenarios.
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The oxidation and spin states of Ni ions are among the most important local properties in this compound, extensively discussed in the context of its superconductivity. Despite their direct link to the electron filling configurations of the relevant \(\rm 3d_{x^2-y^2}\) and \(\rm 3d_{z^2}\) orbitals, these local electronic properties of \(\rm La_3Ni_2O_7\) yet to be systematically investigated. In this work, we address this issue using x-ray absorption spectroscopy (XAS) and x-ray emission spectroscopy (XES) measurements under pressure. Comparison of Ni \textit{K}-edge XAS and \(\rm K\beta\) XES with the reference spectra of \(\rm NiO\) and \(\rm LaNiO_3\) shows that Ni ions, with an average valence of \(\sim 2.53+\), are in a low-spin (\(\rm S = 1/2\)) ground state under ambient conditions. High pressure XAS and XES data clearly show that the oxidation (\(\sim 2.5+\)) and spin (\(\rm S = 1/2\)) states of Ni ions remain stable across the investigated pressure (up to 30 GPa) and temperature (down to 10 K) ranges, ruling out previously proposed spin transition scenarios.</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Absorption spectroscopy ; Electron spin ; Electronic properties ; Emission ; Oxidation ; Spectrum analysis ; Spin transition ; Superconductivity ; X ray absorption</subject><ispartof>arXiv.org, 2024-12</ispartof><rights>2024. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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subjects Absorption spectroscopy
Electron spin
Electronic properties
Emission
Oxidation
Spectrum analysis
Spin transition
Superconductivity
X ray absorption
title Local electronic properties of La3Ni2O7 under pressure
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