Magnetic Field Switching between the Two Orbital-Ordered States inDyVO3

Abstract

The critical phase competition between different spin-orbital-ordered states has been investigated for the DyVO3 single crystal. As temperature is lowered, the compound exhibits a reentrant spin and orbital ordering (SO and OO) transition: C-->G-->C type for SO and G-->C-->G type for OO. It was found that a magnetic field also drives the phase transition from C to G for OO and concomitantly from G to C for SO, the latter of which is coupled with the metamagnetic transition of the Dy 4f moments. The mechanism of this novel magnetic-field-induced orbital switching is discussed.

Critical competition between two distinct orbital-spin ordered states in perovskite vanadates

“…The peak at 674 cm −1 is assigned to the V-O bond stretching vibration mode, which is strongly activated by the lattice distortion coupled to the C-type OO. 3,9 The broad band centered at 470 cm −1 is the two-magnon band characteristic of the G-type SO. A similar spectral feature is also observed for the doped system, x = 0.2 and 0.4.…”

“…8,9 To clarify this issue, we have investigated the field dependence of the magnetization, dielectric property and ͑401͒ Bragg reflection. In Fig.…”

“…Recently, such a switching of the orbital ordering by the external magnetic field has been reported in one of the perovskite-type vanadium oxides, DyVO 3 . 8,9 Perovskite-type vanadium oxides RVO 3 have a Pbnm ͑P2 1 / b2 1 / n2 1 / m͒ orthorhombic structure with lattice constants of a ϳ b ϳ c / ͱ 2 at room temperature. [10][11][12][13] The two distinct patterns of the spin and orbital ordering in this system are schematically shown in Figs.…”

“…1͑c͒, DyVO 3 is located in the close vicinity of the phase boundary between the two distinct spin/ orbital ordered states in the phase diagram, and these ordered states compete with each other. In a previous paper, 9 we have investigated DyVO 3 by measurements of magnetization, Raman-scattering spectra, and x-ray diffraction. As temperature is lowered, the pattern of the spin/orbital ordering in this material shows the reentrant change, C → G → C type/G → C → G type, respectively.…”

Orbital hybridization inRVO3perovskites: A high-pressure study

“…DyVO 3 is at the position where a fragile balance between competing effects is reached, which makes it possible for the orbitalorbital interaction to become dominant again at lowest temperatures, perhaps with help from ordering of the moment at Dy 3+ at the reentrance transition back to the G oo phase. 12 Applying hydrostatic pressure and uniaxial pressure alters the balance in the competition so as to change the transition temperatures. At T CG and T GC , both spin and orbital flipping need not be first order.…”