Pressure effect on the structural transition and suppression of the high-spin state in the triple-layer T'-La4Ni3O8.

Cheng, J-G; Zhou, J-S; Goodenough, J B; Zhou, H D; Matsubayashi, K; Uwatoko, Y; Kong, P P; Jin, C Q; Yang, W G; Shen, G Y

Cheng, J-G; Zhou, J-S; Goodenough, J B; Zhou, H D; Matsubayashi, K; Uwatoko, Y; Kong, P P; Jin, C Q; Yang, W G; Shen, G Y.

Afiliación

Cheng JG; Materials Science and Engineering Program/Mechanical Engineering, University of Texas at Austin, Austin, Texas 78712, USA.

Phys Rev Lett ; 108(23): 236403, 2012 Jun 08.

Article en En | MEDLINE | ID: mdl-23003979

RESUMEN

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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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2012 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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