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Title: Large orbital polarization in a metallic square-planar nickelate

Abstract

High temperature cuprate superconductivity remains a defining problem in condensed matter physics.1,2 Among myriad approaches to addressing this problem has been the study of alternative transition metal oxides3,4 with similar structures and 3d electron count that are suggested as proxies for cuprate physics. Here, we report one such alternative: the low-valent, quasi-two-dimensional trilayer nickelates, R4Ni3O8 (R=La and Pr). By combining x-ray absorption spectroscopy and density functional theory calculations, we find that these compounds exhibit a low-spin configuration and significant orbital polarization of the unoccupied eg states with pronounced dx2-y2 character near the Fermi energy. Notably, a charge-ordered stripe phase, previously reported for La4Ni3O8,5 collapses in favor of a metallic ground state when substituting La with Pr, offering entrée to a region of 3d electron count important to hole-doped high-Tc cuprates but in the absence of quenched disorder.

Authors:
ORCiD logo; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1395884
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nature Physics; Journal Volume: 13; Journal Issue: 9
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Junjie, Botana, A. S., Freeland, J. W., Phelan, D., Zheng, Hong, Pardo, V., Norman, M. R., and Mitchell, J. F.. Large orbital polarization in a metallic square-planar nickelate. United States: N. p., 2017. Web. doi:10.1038/NPHYS4149.
Zhang, Junjie, Botana, A. S., Freeland, J. W., Phelan, D., Zheng, Hong, Pardo, V., Norman, M. R., & Mitchell, J. F.. Large orbital polarization in a metallic square-planar nickelate. United States. doi:10.1038/NPHYS4149.
Zhang, Junjie, Botana, A. S., Freeland, J. W., Phelan, D., Zheng, Hong, Pardo, V., Norman, M. R., and Mitchell, J. F.. Mon . "Large orbital polarization in a metallic square-planar nickelate". United States. doi:10.1038/NPHYS4149.
@article{osti_1395884,
title = {Large orbital polarization in a metallic square-planar nickelate},
author = {Zhang, Junjie and Botana, A. S. and Freeland, J. W. and Phelan, D. and Zheng, Hong and Pardo, V. and Norman, M. R. and Mitchell, J. F.},
abstractNote = {High temperature cuprate superconductivity remains a defining problem in condensed matter physics.1,2 Among myriad approaches to addressing this problem has been the study of alternative transition metal oxides3,4 with similar structures and 3d electron count that are suggested as proxies for cuprate physics. Here, we report one such alternative: the low-valent, quasi-two-dimensional trilayer nickelates, R4Ni3O8 (R=La and Pr). By combining x-ray absorption spectroscopy and density functional theory calculations, we find that these compounds exhibit a low-spin configuration and significant orbital polarization of the unoccupied eg states with pronounced dx2-y2 character near the Fermi energy. Notably, a charge-ordered stripe phase, previously reported for La4Ni3O8,5 collapses in favor of a metallic ground state when substituting La with Pr, offering entrée to a region of 3d electron count important to hole-doped high-Tc cuprates but in the absence of quenched disorder.},
doi = {10.1038/NPHYS4149},
journal = {Nature Physics},
number = 9,
volume = 13,
place = {United States},
year = {Mon Jun 12 00:00:00 EDT 2017},
month = {Mon Jun 12 00:00:00 EDT 2017}
}