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Unusual spin fluctuations and magnetic frustration in olivine and non-olivine LiCoPO4 detected by 31P and 7Li nuclear magnetic resonance

We report 31P and 7Li nuclear magnetic resonance (NMR) studies in new non-olivine LiZnPO4-type LiCoPOtetra4 microcrystals, where the Co2+ ions are tetrahedrally coordinated. Olivine LiCoPO4, which was directly transformed from LiCoPOtetra4 by an annealing process, was also studied and compared. The...

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Bibliographische Detailangaben
Hauptverfasser: Baek, Seung-Ho (VerfasserIn) , Klingeler, Rüdiger (VerfasserIn) , Neef, Christoph (VerfasserIn) , Koo, Changhyun (VerfasserIn) , Büchner, B. (VerfasserIn) , Grafe, H.-J. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 24 April 2014
In: Physical review. B, Condensed matter and materials physics
Year: 2014, Jahrgang: 89, Heft: 13
ISSN:1550-235X
DOI:10.1103/PhysRevB.89.134424
Online-Zugang:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.89.134424
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.89.134424
Volltext
Verfasserangaben:S.-H. Baek, R. Klingeler, C. Neef, C. Koo, B. Büchner, H.-J. Grafe
Beschreibung
Zusammenfassung:We report 31P and 7Li nuclear magnetic resonance (NMR) studies in new non-olivine LiZnPO4-type LiCoPOtetra4 microcrystals, where the Co2+ ions are tetrahedrally coordinated. Olivine LiCoPO4, which was directly transformed from LiCoPOtetra4 by an annealing process, was also studied and compared. The uniform bulk magnetic susceptibility and the 31P Knight shift obey the Curie-Weiss law for both materials with a high spin Co2+ (3d7, S=3/2), but the Weiss temperature Θ and the effective magnetic moment μeff are considerably smaller in LiCoPOtetra4. The spin-lattice relaxation rate T−11 reveals a quite different nature of the spin dynamics in the paramagnetic state of both materials. Our NMR results imply that strong geometrical spin frustration occurs in tetrahedrally coordinated LiCoPO4, which may lead to the incommensurate magnetic ordering.
Beschreibung:Im Titel erscheint die 4 tiefgestellt, die Zahlen 31 und 7 erscheinen hochgestellt
Gesehen am 02.09.2020
Beschreibung:Online Resource
ISSN:1550-235X
DOI:10.1103/PhysRevB.89.134424

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