Spin-liquid behavior in the spinel-type Cu(Cr1−xZrx)2S4

(Cu)tet(Cr2–xSnx)octS4–ySey Spinels: Crystal Structure, Density Functional Theory Calculations, and Magnetic Behavior

“…The theoretical calculated magnetic moments (μ theo ) clearly demonstrated that Sn shows diamagnetic behavior with an oxidation state of 4+. These results are well correlated to the models of (Cu) tet [Cr 2– x M x ] oct Se 4 spinels, where M and Cu exist in the 4+ and 1+ oxidation states, respectively. ,,− …”

“…(Cu) tet [Cr 2– x Sn x ] oct Se 4 showed evident ferromagnetic behavior at x = 0.3, whereas at x = 0.7, antiferromagnetic (AF) behavior was observed with a dominant ferromagnetic character in the exchange interactions . Chemical substitutions of Cr, such as in (Cu) tet [Cr 2– x M x ] oct Se 4 spinels, revealed that M exists in the 4+ oxidation state, whereas Cu exists as a diamagnetic Cu + cation. − …”

Crystal structure, Raman scattering and magnetic properties of CuCr2−Zr Se4 and CuCr2−Sn Se4 selenospinels

“…Several studies on CuCr 2-x M x Q 4 spinels revealed that whereas copper exists as the diamagnetic Cu + cation the M atoms array exist in the 4+ oxidation state (M = Ti, Zr, Hf), thus changing the properties of the original material [11][12][13][14][15]. Thus, the chemical substitutions of chromium in CuCr 2 Se 4 end-member by M 4+ cations play an important role in the particular magnetic/electrical properties of these compounds.…”