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Title: Pressure Effect on the Structural Transition and Suppression of the High-Spin State in the Triple-Layer T '-La₄Ni₃O₈

We report a comprehensive high-pressure study on the triple-layer T '-La₄Ni₃O₈ with a suite of experimental probes, including structure determination, magnetic, and transport properties up to 50 GPa. Consistent with a recent ab inito calculation, application of hydrostatic pressure suppresses an insulator-metal spin-state transition at P c≈6 GPa. However, a low-spin metallic phase does not emerge after the high-spin state is suppressed to the lowest temperature. For P>20 GPa, the ambient T' structure transforms gradually to a T -type structure, which involves a structural reconstruction from fluorite La–O₂–La blocks under low pressures to rock-salt LaO-LaO blocks under high pressures. Absence of the metallic phase under pressure has been discussed in terms of local displacements of O²⁻ ions in the fluorite block under pressure before a global T† phase is established.
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Publication Date:
Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 23; Related Information: CHORUS Timestamp: 2017-04-06 12:01:23; Journal ID: ISSN 0031-9007
American Physical Society
Sponsoring Org:
Country of Publication:
United States
OSTI Identifier: