@article{ISI:000473017300002,
 abstract = {The origin of simultaneous electronic, structural, and magnetic
transitions in bulk rare-earth nickelates (RENiO3) remains puzzling with
multiple conflicting reports on the nature of these entangled phase
transitions. Heterostructure engineering of these materials offers
unique opportunity to decouple the metal-insulator transition (MIT) from
the magnetic transition. However, the evolution of underlying electronic
properties across these decoupled transitions remains largely
unexplored. In order to address this, we have measured Hall effect on a
series of epitaxial NdNiO3 films, spanning a variety of electronic and
magnetic phases. We find that the MIT results in only a partially gapped
Fermi surface, whereas the full insulating phase forms below the
magnetic transition. In addition, we also find a systematic reduction of
the Hall coefficient R-H in the metallic phase of these films with
epitaxial strain and also a surprising transition to a negative value at
large compressive strain. The partially gapped, weakly insulating,
paramagnetic phase is reminiscence of pseudogap behavior of high-T-c
cuprates. The precursor metallic phase, which undergoes transition to
the insulating phase, is a non-Fermi liquid with a temperature exponent
n of resistivity of 1, whereas the exponent increases to 4/3 in the
noninsulating samples. Such a nickelate phase diagram with sign reversal
of R-H, a pseudogap phase, and non-Fermi-liquid behavior is intriguingly
similar to high-T-c cuprates, giving important guidelines to engineer
unconventional superconductivity in oxide heterostructures.},
 article-number = {235153},
 author = {Ojha, Shashank Kumar and Ray, Sujay and Das, Tanmoy and Middey, S. and
Sarkar, Sagar and Mahadevan, Priya and Wang, Zhen and Zhu, Yimei and
Liu, Xiaoran and Kareev, M. and Chakhalian, J.},
 doi = {10.1103/PhysRevB.99.235153},
 eissn = {2469-9969},
 issn = {2469-9950},
 journal = {PHYSICAL REVIEW B},
 month = {JUN 27},
 number = {23},
 orcid-numbers = {Middey, Srimanta/0000-0001-5893-0946
},
 researcherid-numbers = {Middey, Srimanta/D-9580-2013
Liu, Xiaoran/AAV-8884-2020},
 times-cited = {5},
 title = {Anomalous electron transport in epitaxial NdNiO3 films},
 unique-id = {ISI:000473017300002},
 volume = {99},
 year = {2019}
}