Abstract
A series of CuCr2-xSnxS2.3Se1.7 and CuCr2-xSnxS1.7Se2.3 (x = 0.4, 0.6, and 1.0) compounds were prepared by solid-state reaction at a high temperature. Single-crystal X-ray diffraction analysis showed that CuCr1.1Sn0.9S2.3Se1.7 crystallizes in a spinel-type structure (cubic Fd3¯m space group). The others samples were also consistent with a spinel-type structure but through powder X-ray diffraction patterns and Rietveld refinements. The systems studies showed p-type semiconductor behavior with a carrier concentration per volume of approximately ~+1020 cm−3. The electrical conductivity, σ, showed tin-content dependence. The conductivity of CuCr2-xSnxS1.7Se2.3 increased from ~9.0 to ~17.0 S·cm−1 at room temperature (RT) for x = 0.4 and 0.6, respectively, and the magneto-resistance average value determined for CuCr2-xSnxS2.3Se1.7 and CuCr2-xSnxS1.7Se2.3 was approximately ~10−4 Ω (0.566 T, external magnetic field). DFT calculations revealed that the Cr centers concentrated most of the spin density. A smaller spin polarization featuring the opposite spin was observed for S/Se atoms.
Highlights
The magnetic and transport properties of AB2 X4 chalcogenide spinels are strongly influenced by the distribution of the metal ions in the structure
Replacing metal ions in the octahedral or tetrahedral position with diamagnetic ions can alter the magnetic properties of CuCr2 S4 and CuCr2 Se4
The method we applied to solve the crystal structure was that of a model CuCr2 Se4 . In (Cu) atom occupying the tetrahedral (A) sites, and Cr and
Summary
The magnetic and transport properties of AB2 X4 chalcogenide spinels are strongly influenced by the distribution of the metal ions in the structure. An interesting property of spinels containing Cr is magnetoresistance, which refers to the change in the electrical resistance of materials in the presence of a magnetic field [1]. This has been the focus of many studies because of its potential for use in new data storage devices with reduced energy consumption [2,3]. Solid solutions of seleno- and thiospinels have been well studied because of their extraordinary electrical and magnetic properties, which can differ significantly by substitution [4,5,6,7,8,9,10,11]. In (Cu)tet [Cr2-x Mx ]oct Se4 spinels, the substitutions of Cr by
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
