Abstract:
:Resistances that exceed the Mott-Ioffe-Regel limit (known as bad metal behavior) and non-Fermi liquid behavior are ubiquitous features of the normal state of many strongly correlated materials. We establish the conditions that lead to bad metal and non-Fermi liquid phases in NdNiO3, which exhibits a prototype bandwidth-controlled metal-insulator transition. We show that resistance saturation is determined by the magnitude of Ni eg orbital splitting, which can be tuned by strain in epitaxial films, causing the appearance of bad metal behavior under certain conditions. The results shed light on the nature of a crossover to a non-Fermi liquid metal phase and provide a predictive criterion for Anderson localization. They elucidate a seemingly complex phase behavior as a function of film strain and confinement and provide guidelines for orbital engineering and novel devices.
journal_name
Sci Advjournal_title
Science advancesauthors
Mikheev E,Hauser AJ,Himmetoglu B,Moreno NE,Janotti A,Van de Walle CG,Stemmer Sdoi
10.1126/sciadv.1500797subject
Has Abstractpub_date
2015-11-06 00:00:00pages
e1500797issue
10issn
2375-2548pii
1500797journal_volume
1pub_type
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