Journal
APL MATERIALS
Volume 3, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4907771
Keywords
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Funding
- FAME
- one of six centers of STARnet
- Semiconductor Research Corporation program - MARCO
- DARPA
- Elings Prize Fellowship of the California Nanosystems Institute at University of California, Santa Barbara
- MURI program of the Army Research Office [W911-NF-09-1-0398]
- UCSB MRL - MRSEC Program of the NSF [DMR 1121053]
- NSF via UC Irvine [NSF HRD-1102531]
- NSF - NNIN network
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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 similar to 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. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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