Antiferromagnetic defect structure in single crystals
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Illinois at Chicago, Chicago, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
The origins of the metal-insulator and magnetic transitions exhibited by perovskite rare-earth nickelates, RNiO3 (where R is a rare-earth element), remain open issues, with charge disproportionation, magnetic interactions, and lattice response across multiple length scales being among the many possible origins. Recently, growth of single crystals of LaNiO3, which is the only member of these compounds that remains metallic in its ground state, has been reported, opening a new chapter in the investigation of the perovskite nickelates. Here, using a combination of magnetometry, heat capacity, and neutron scattering on as-grown and purposely reduced LaNiO3-delta crystals, we show that both antiferromagnetic and ferromagnetic phases with a Neel temperature of similar to 152 K and a Curie temperature of similar to 225 K can be induced by reduction of the oxygen content. Transmission electron microscopy shows that these phases are characterized by ordered oxygen vacancy defect structures that exist as dilute secondary phases in as-grown crystals despite growth in partial oxygen pressures up to at least 130 bar. The demonstration of antiferromagnetism resulting from oxygen vacancy ordered structures implies that stoichiometry must be explicitly considered when interpreting the bulk properties of LaNiO3-(delta) single crystals; accordingly, the implications of our results for putative oxygen-stoichiometric LaNiO3 are discussed.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357
- OSTI ID:
- 1454392
- Alternate ID(s):
- OSTI ID: 1441245; OSTI ID: 1461509
- Journal Information:
- Physical Review Materials, Vol. 2, Issue 6; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Distortion mode anomalies in bulk : Illustrating the potential of symmetry-adapted distortion mode analysis for the study of phase transitions
|
journal | November 2019 |
High pO2 Floating Zone Crystal Growth of the Perovskite Nickelate PrNiO3
|
journal | June 2019 |
High pO2 Floating Zone Crystal Growth of the Perovskite Nickelate PrNiO3 | text | January 2019 |
Late transition-metal oxides with infinite-layer structure: Nickelates versus cuprates | text | January 2019 |
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