Oxygen-nonstoichiometry-driven phase transition in Sr1−xNdxCoO3−δ (x = 0.1, 0.2, 0.3) perovskites
Abstract
We report a systematic study of the interplay between oxygen nonstoichiometry, crystal structure, and magnetic/electrotransport properties in Sr1−xNdxCoO3−δ (x = 0.1, 0.2, 0.3). High-resolution neutron powder diffraction combined with synchrotron x-ray powder diffraction reveals that increasing the oxygen content induces a structural transition from a layered I4/mmm (2ap × 2ap × 4ap) to an oxygen-deficient orthorhombic Pmmm (ap × ap × 2ap) phases with preferential oxygen-vacancy occupation. This transition is accompanied by a crossover from G-type antiferromagnetic with a weak ferromagnetic component to a ferromagnetic state, and a drastic decay in resistivity. The evolution of the magnetic and transport properties is discussed in terms of changes in the Co spin state, enhanced Co 3d - O 2p orbital overlap upon oxygen uptake, and a magnetically inhomogeneous ferromagnetic state associated with residual oxygen vacancies and mixed Co3+/Co4+ valence. Our findings experimentally confirm that the stabilization of the layered "314" structure is driven by the presence and ordering of oxygen vacancies rather than A-site cation ordering, whereas the oxygen-deficient oxidized compounds represent an intermediate orthorhombic state preceding fully stoichiometric phases.
Versions
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BibTeX
@misc{tereshko2026oxygennonstoichiometrydriven,
title = {{Oxygen-nonstoichiometry-driven phase transition in $\mathrmSr_1-x\mathrmNd_x\mathrmCoO_3-δ$ ($x = 0.1, 0.2, 0.3$) perovskites}},
author = {Nina Tereshko and Roman Lanovsky and Olivier Toulemonde and Maxim Bushinsky and Stanislav Savvin and Vadim Sikolenko and Lingyan Xu and Aleksandr Nikitin},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2607.10346},
eprint = {2607.10346},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2607.10346},
}
RIS
TY - UNPB
TI - Oxygen-nonstoichiometry-driven phase transition in Sr_1−xNd_xCoO_3−δ (x = 0.1, 0.2, 0.3) perovskites
AU - Nina Tereshko
AU - Roman Lanovsky
AU - Olivier Toulemonde
AU - Maxim Bushinsky
AU - Stanislav Savvin
AU - Vadim Sikolenko
AU - Lingyan Xu
AU - Aleksandr Nikitin
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2607.10346
UR - https://arxiv.org/abs/2607.10346
AB - We report a systematic study of the interplay between oxygen nonstoichiometry, crystal structure, and magnetic/electrotransport properties in Sr_1−xNd_xCoO_3−δ (x = 0.1, 0.2, 0.3). High-resolution neutron powder diffraction combined with synchrotron x-ray powder diffraction reveals that increasing the oxygen content induces a structural transition from a layered I4/mmm (2a_p × 2a_p × 4a_p) to an oxygen-deficient orthorhombic Pmmm (a_p × a_p × 2a_p) phases with preferential oxygen-vacancy occupation. This transition is accompanied by a crossover from G-type antiferromagnetic with a weak ferromagnetic component to a ferromagnetic state, and a drastic decay in resistivity. The evolution of the magnetic and transport properties is discussed in terms of changes in the Co spin state, enhanced Co 3d - O 2p orbital overlap upon oxygen uptake, and a magnetically inhomogeneous ferromagnetic state associated with residual oxygen vacancies and mixed Co^3+/Co^4+ valence. Our findings experimentally confirm that the stabilization of the layered "314" structure is driven by the presence and ordering of oxygen vacancies rather than A-site cation ordering, whereas the oxygen-deficient oxidized compounds represent an intermediate orthorhombic state preceding fully stoichiometric phases.
ER -