UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3

Vale, JG; Calder, S; Donnerer, C; Pincini, D; Shi, YG; Tsujimoto, Y; Yamaura, K; ... McMorrow, DF; + view all (2018) Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3. Physical Review B , 97 , Article 184429. 10.1103/PhysRevB.97.184429. Green open access

[img]
Preview
Text
Vale PhysRevB.97.184429.pdf - Published version

Download (1MB) | Preview

Abstract

NaOsO 3 undergoes a metal-insulator transition (MIT) at 410 K, concomitant with the onset of antiferromagnetic order. The excitation spectra have been investigated through the MIT by resonant inelastic x-ray scattering (RIXS) at the Os L 3 edge. Low resolution ( Δ E ∼ 300 meV ) measurements over a wide range of energies reveal that local electronic excitations do not change appreciably through the MIT. This is consistent with a picture in which structural distortions do not drive the MIT. In contrast, high resolution ( Δ E ∼ 56 meV ) measurements show that the well-defined, low-energy magnons in the insulating state weaken and dampen upon approaching the metallic state. Concomitantly, a broad continuum of excitations develops which is well described by the magnetic fluctuations of a nearly antiferromagnetic Fermi liquid. By revealing the continuous evolution of the magnetic quasiparticle spectrum as it changes its character from itinerant to localized, our results provide unprecedented insight into the nature of the MIT in NaOsO 3 . In particular, the presence of weak correlations in the paramagnetic phase implies a degree of departure from the ideal Slater limit.

Type: Article
Title: Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO3
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.97.184429
Publisher version: https://doi.org/10.1103/PhysRevB.97.184429
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/10047445
Downloads since deposit
0Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item