期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.236403
关键词
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资金
- NSF [DMR0904282, MIRT DMR1122603, DMR0654118]
- Robert A. Welch Foundation [F-1066]
- State of Florida
- MOST of China
- CIW
- CDAC
- UNLV
- LLNL
- DOE-NNSA
- DOE-BES
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [904282, 1122603] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [19GS0205] Funding Source: KAKEN
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 approximate to 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-dagger-type structure, which involves a structural reconstruction from fluorite La-O-2-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 O(2-)ions in the fluorite block under pressure before a global T-dagger phase is established.
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