Gaps and pseudogaps in perovskite rare earth nickelates
Abstract
We report on tunneling measurements that reveal the evolution of the quasiparticle state density in two rare earth perovskite nickelates, NdNiO3 and LaNiO3, that are close to a bandwidth controlled metal to insulator transition. We measure the opening of a sharp gap of ~30 meV in NdNiO3 in its insulating ground state. LaNiO3, which remains a correlated metal at all practical temperatures, exhibits a pseudogap of the same order. The results point to both types of gaps arising from a common origin, namely, a quantum critical point associated with the T = 0 K metal-insulator transition. The results support theoretical models of the quantum phase transition in terms of spin and charge instabilities of an itinerant Fermi surface.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 23, 2015
- Accession Number
- AD1062213
Entities
People
- Adam J. Hauser
- Alex Kozhanov
- Daniel G. Ouellette
- Evgeny Mikheev
- Jack Y. Zhang
- James Kally
- Junwoo Son
- Leon Balents
- Nelson E. Moreno
- S. J. Allen
- Susanne Stemmer
Organizations
- University of California