Field induced metamagnetic transitions in quasi-one-dimensional Ising spin chain CoV2O6

Abstract

We have investigated the temperature and magnetic field dependence of magnetization (M ), specific heat (Cp), and relative sample length change (∆L/L0) for understanding the field-induced metamagnetic transitions in quasi-one-dimensional monoclinic (α phase) and triclinic (γ phase) CoV2O6 spin chains. With the application of external magnetic field, a sharp peak emerges in Cp(T ) below TN =15 K in α phase and a hump-like feature appears above TN =6.5 K in γ phase due to the field-induced ferrimagnetic and ferromagnetic transitions, respectively. Strong field dependence of linear thermal expansion and large positive magnetostriction have been observed in α phase. Though magnetization data indicate strong spin-orbit coupling for both phases, other measurements show that this effect is very weak for the γ phase.

Spin-charge-lattice coupling in quasi-one-dimensional Ising spin chain CoNb2O6

“…The magnetic phase diagram of Ising spin chain BaCo 2 V 2 O 8 was constructed solely from thermal expansion data [9]. Also, the spin-lattice coupling strength in two polymorphs of Ising chain CoV 2 O 6 was compared from thermal expansion and magnetostriction measurements [10].…”