{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T13:10:37Z","timestamp":1790082637261,"version":"4.0.1"},"reference-count":59,"publisher":"American Chemical Society (ACS)","issue":"18","license":[{"start":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T00:00:00Z","timestamp":1788480000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100006151","name":"Basic Energy Sciences","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100006151","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,22]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>The pressure-induced structural phase transitions of the superconducting Ruddlesden\u2013Popper nickelate La3Ni2O7 remain under active debate. While the Amam phase is generally identified as the non-superconducting ambient-pressure structure, several higher-symmetry phases have been proposed to emerge under compression; these phases would potentially host superconductivity. Adding to this complexity, experimental and theoretical studies consistently report oxygen vacancies in La3Ni2O7, raising questions about the impact of oxygen vacancies and other intrinsic defects on the material\u2019s electronic and superconducting properties. Although vacancies are known to strongly affect the electronic properties of oxides in general, their influence on the relative stability of the high-pressure phases of La3Ni2O7 has not been examined. To address this gap, we employ many-body diffusion Monte Carlo to investigate the role of oxygen vacancy defects in La3Ni2O7. We apply this approach across the structural phases Amam, Fmmm, I4\/mmm, and Cmmm at T = 0 to obtain a comprehensive understanding of their defect energetics. Our results show that departures from oxygen stoichiometry significantly alter the stability of the high-pressure phases. In particular, the oxygen vacancy stabilizes the experimentally observed Fmmm phase at higher pressures compared to the stoichiometric phases. Our findings indicate that vacancy formation under pressure may act as a driving mechanism for the phase transition, providing new insight into the stabilization pathways of La3Ni2O7 and their connection to possible superconducting behavior.<\/jats:p>","DOI":"10.1021\/acs.chemmater.6c01607","type":"journal-article","created":{"date-parts":[[2026,9,4]],"date-time":"2026-09-04T15:09:31Z","timestamp":1788534571000},"page":"9450-9460","source":"Crossref","is-referenced-by-count":0,"title":["The Role of Intrinsic Defects in the Structural Transition\nof Superconducting La3Ni2O7: A Many-Body\nDMC Prediction"],"prefix":"10.1021","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4119-0168","authenticated-orcid":true,"given":"Abdul","family":"Ghaffar","sequence":"first","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2240-8520","authenticated-orcid":true,"given":"Kayahan","family":"Saritas","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernando A.","family":"Reboredo","sequence":"additional","affiliation":[{"name":"Oak Ridge National Laboratory , , , ,","place":["Oak Ridge, Tennessee, United States, 37831"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,4]]},"reference":[{"issue":"22","key":"2026092208095804400_cit1","doi-asserted-by":"publisher","first-page":"L220505","DOI":"10.1103\/byl4-zbfv","article-title":"Evolution\nof electronic correlations in the Ruddlesden-Popper nickelates","volume":"111","author":"Liu","year":"2025","journal-title":"Phys. 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