Open AccessGaps and pseudogaps in perovskite rare earth nickelates
Author(s) -
S. J. Allen,
Adam J. Hauser,
Evgeny Mikheev,
Jack Zhang,
Nelson E. Moreno,
Junwoo Son,
Daniel G. Ouellette,
James Kally,
Alexander Kozhanov,
Leon Balents,
Susanne Stemmer
Publication year - 2015
Publication title -
apl materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.571
H-Index - 60
ISSN - 2166-532X
DOI - 10.1063/1.4907771
Subject(s) - pseudogap , condensed matter physics , quasiparticle , quantum critical point , metal–insulator transition , materials science , perovskite (structure) , strongly correlated material , density of states , quantum phase transition , quantum tunnelling , ground state , fermi level , physics , phase transition , metal , superconductivity , electron , cuprate , atomic physics , chemistry , quantum mechanics , metallurgy , crystallography
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
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