Document Detail

Pressure effect on the structural transition and suppression of the high-spin state in the triple-layer t^{'}-la_{4}ni_{3}o_{8}.
MedLine Citation:
PMID:  23003979     Owner:  NLM     Status:  In-Data-Review    
We report a comprehensive high-pressure study on the triple-layer T^{'}-La_{4}Ni_{3}O_{8} 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-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^{†} phase is established.
J-G Cheng; J-S Zhou; J B Goodenough; H D Zhou; K Matsubayashi; Y Uwatoko; P P Kong; C Q Jin; W G Yang; G Y Shen
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Publication Detail:
Type:  Journal Article     Date:  2012-06-08
Journal Detail:
Title:  Physical review letters     Volume:  108     ISSN:  1079-7114     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-09-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  236403     Citation Subset:  IM    
Materials Science and Engineering Program/Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA.
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