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Title: 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, NdNiO{sub 3} and LaNiO{sub 3}, that are close to a bandwidth controlled metal to insulator transition. We measure the opening of a sharp gap of ∼30 meV in NdNiO{sub 3} in its insulating ground state. LaNiO{sub 3}, 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.

Authors:
; ; ;  [1]; ; ; ; ; ;  [2];  [1]
  1. Department of Physics, University of California, Santa Barbara, California 93106 (United States)
  2. Materials Department, University of California, Santa Barbara, California 93106 (United States)
Publication Date:
OSTI Identifier:
22415294
Resource Type:
Journal Article
Journal Name:
APL materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2166-532X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DENSITY; ENERGY GAP; FERMI LEVEL; GROUND STATES; LANTHANUM COMPOUNDS; NEODYMIUM COMPOUNDS; NICKELATES; PEROVSKITE; PHASE TRANSFORMATIONS; SPIN; TUNNEL EFFECT

Citation Formats

Allen, S. James, Ouellette, Daniel G., Kally, James, Kozhanov, Alex, Hauser, Adam J., Mikheev, Evgeny, Zhang, Jack Y., Moreno, Nelson E., Son, Junwoo, Stemmer, Susanne, Balents, Leon, and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106. Gaps and pseudogaps in perovskite rare earth nickelates. United States: N. p., 2015. Web. doi:10.1063/1.4907771.
Allen, S. James, Ouellette, Daniel G., Kally, James, Kozhanov, Alex, Hauser, Adam J., Mikheev, Evgeny, Zhang, Jack Y., Moreno, Nelson E., Son, Junwoo, Stemmer, Susanne, Balents, Leon, & Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106. Gaps and pseudogaps in perovskite rare earth nickelates. United States. https://doi.org/10.1063/1.4907771
Allen, S. James, Ouellette, Daniel G., Kally, James, Kozhanov, Alex, Hauser, Adam J., Mikheev, Evgeny, Zhang, Jack Y., Moreno, Nelson E., Son, Junwoo, Stemmer, Susanne, Balents, Leon, and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106. 2015. "Gaps and pseudogaps in perovskite rare earth nickelates". United States. https://doi.org/10.1063/1.4907771.
@article{osti_22415294,
title = {Gaps and pseudogaps in perovskite rare earth nickelates},
author = {Allen, S. James and Ouellette, Daniel G. and Kally, James and Kozhanov, Alex and Hauser, Adam J. and Mikheev, Evgeny and Zhang, Jack Y. and Moreno, Nelson E. and Son, Junwoo and Stemmer, Susanne and Balents, Leon and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106},
abstractNote = {We report on tunneling measurements that reveal the evolution of the quasiparticle state density in two rare earth perovskite nickelates, NdNiO{sub 3} and LaNiO{sub 3}, that are close to a bandwidth controlled metal to insulator transition. We measure the opening of a sharp gap of ∼30 meV in NdNiO{sub 3} in its insulating ground state. LaNiO{sub 3}, 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.},
doi = {10.1063/1.4907771},
url = {https://www.osti.gov/biblio/22415294}, journal = {APL materials},
issn = {2166-532X},
number = 6,
volume = 3,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 2015},
month = {Mon Jun 01 00:00:00 EDT 2015}
}