Ni intercalation of titanium diselenide: Effect on the lattice, specific heat and magnetic properties

N. V. Baranov, K. Inoue, V. I. Maksimov, A. S. Ovchinnikov, V. G. Pleschov, A. Podlesnyak, A. N. Titov, N. V. Toporova

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Abstract

Intercalated NixTiSe2 compounds with Ni concentration up to x = 0.5 have been investigated using x-ray diffraction, magnetic susceptibility and specific heat measurements. A set of peculiarities caused by the intercalation, such as a significant decrease of the gap between Se-Ti-Se trilayers and depletion of the low-frequency phonons due to the stiffening of the lattice as well as an enhancement of the density of electronic states at low Ni content (x < 0.33), is attributed to hybridization of the Ni 3d states with TiSe2 bands and formation of covalent-like links between Se-Ti-Se trilayers via the inserted Ni ions. Ni xTiSe2 compounds with intercalant content up to x = 0.5 show a paramagnetic behaviour unlike MxTiSe2 compounds intercalated by other 3d metals (M = Cr, Mn, Fe, Co). The Ni magnetic moment in NixTiSe2 is suggested to be of an itinerant nature. A pronounced correlation between the change of the lattice parameter c 0 and the value of the effective magnetic moment, which is observed in NixTiSe2 as well in MxTiSe2 systems intercalated by other 3d metals, indicates that the magnetic moment on the inserted atom is controlled by the hybridization degree of M 3d states with TiSe2 bands.

Original languageEnglish
Pages (from-to)9243-9258
Number of pages16
JournalJournal of Physics Condensed Matter
Volume16
Issue number50
DOIs
StatePublished - Dec 22 2004
Externally publishedYes

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