Effect of an inner-transition metal (Dy) intercalation on the structure and magnetic properties of 1T–TiSe2.

1T-TiSe 2 is one of the layered transition metals dichalcogenides (LTMDs) which exhibits charge density wave (CDW), but doesn't show superconductivity. However, interesting properties such as superconductivity, antiferromagnetism, ferromagnetism etc. can be induced by intercalation of suitable ions in the 1T-TiSe 2 structure. In this article, we have investigated the structural and magnetic properties of Dy intercalated TiSe 2. The powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM) analysis confirm pure (single) phase formation and layered morphology of Dy x TiSe 2 (x ​= ​0, 0.02, 0.04, 0.06, 0.08). Intercalation process is further confirmed by Raman study as no new peak appeared with intercalation. XPS spectra shows the trivalent, tetravalent and divalent nature of Dy, Ti and Se respectively. Further, it also confirms the transfer of charge from Ti to Dy as result of intercalation in TiSe 2. The magnetic measurements on 1T–TiSe 2 show Pauli paramagnetic behavior, while Dy intercalated samples with x ​= ​0.06 and 0.08 show antiferromagnetic ordering below 4 ​K. Dy is found to be electrostatically interacting with the TiSe 2 layers resulting nominal structural alteration. Dy intercalation aided transformation of the magnetic properties from Pauli paramagnetism to antiferromagnetism in Dy x TiSe 2. [Display omitted] • Synthesis of Dy x TiSe 2 (x ​= ​0, 0.02, 0.04, 0.06, 0.08) by high temperature solid state method (sealed tube method). • XPS studies of Dy 0.08 TiSe 2 shows the valence states of Ti4+, Se2− and Dy3+. • Dy intercalation in Dy x TiSe 2 induces antiferromagnetism for x ​= ​0.06, 0.08. [ABSTRACT FROM AUTHOR]