Unconventional magnetostructural transition in CoCr2O4 at high magnetic fields

Abstract

The magnetic-field and temperature dependencies of ultrasound propagation and magnetization of single-crystalline CoCr2O4 have been studied in static and pulsed magnetic fields up to 14 T and 62 T, respectively. Distinct anomalies with significant changes in the sound velocity and attenuation are found in this spinel compound at the onset of long-range incommensurate spiral-spin order at T_s = 27 K and at the transition from the incommensurate to the commensurate state at T_l = 14 K, evidencing strong spin-lattice coupling. While the magnetization evolves gradually with field, steplike increments in the ultrasound clearly signal a transition into a new magneto-structural state between 6.2 and 16.5 K and at high magnetic fields. We argue that this is a high-symmetry phase with only the longitudinal component of the magnetization being ordered, while the transverse helical component remains disordered. This phase is metastable in an extended H-T phase space.

5 pages, 4 figures

References in corpus (7)

• Dielectric anomalies and spiral magnetic order in CoCr2O4
• Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4
• Spin-phonon coupling in antiferromagnetic chromium spinels
• Spin-driven Phonon Splitting in Bond-frustrated ZnCr2S4
• Magnetic coupling in CoCr_2O_4 and MnCr_2O_4: an LSDA+U study
• Spin Frustration and Magnetic Exchange in Cobalt Aluminum Oxide Spinels
• Spin-driven Phase Transitions in ZnCr${}_2$Se${}_4$ and ZnCr${}_2$S${}_4$ Probed by High Resolution Synchrotron X-ray and Neutron Powder Diffraction

Cited by in corpus (18)

• Spin-Hall magnetoresistance and spin Seebeck effect in spin-spiral and paramagnetic phases of multiferroic CoCr2O4 films
• Structural ground states of ($A,A^{\prime }$)Cr${}_2$O${}_4$($A$=Mg, Zn; $A^{\prime }$ = Co, Cu) spinel solid solutions: Spin-Jahn-Teller and Jahn-Teller effects
• Observation of an inter-sublattice exchange magnon in CoCr${}_2$O${}_4$ and analysis of magnetic ordering
• Magnetoelectric and Raman spectroscopic studies of single-crystalline MnCr2O4
• Magnetic properties of strained multiferroic CoCr2O4: a soft X-ray study
• Spin-lattice coupling in a ferrimagnetic spinel: The exotic $H$-$T$ phase diagram of MnCr${}_2$S${}_4$ up to 110 T
• Magnons and Magnetodielectric Effects in CoCr${}_2$O${}_4$: Raman Scattering Studies
• Ultrasound measurement technique for the single-turn-coil magnets
• Emergent magnetic state in (111)-oriented quasi-two-dimensional spinel oxides
• Element-specific field-induced spin reorientation and an unusual tetracritical point in MnCr2S4
• First-principles investigations into the thermodynamics of cation disorder and it's impact on electronic structure and magnetic properties of spinel $Co{\left(C{r}_{1-x}M{n}_x\right)}_2{O}_4$
• Magnetostructural transition, metamagnetism, and magnetic phase coexistence in Co10Ge3O16
• Magnetic field dependent cycloidal rotation in pristine and Ge doped CoCr${}_2$O${}_4$
• On the complexity of spinels: Magnetic, electronic, and polar ground states
• Site occupancies and their effects on the physical properties of spinel $Co{\left(C{r}_{1-x}F{e}_x\right)}_2{O}_4$: an {\it ab initio} study
• High-field phase diagram of the chiral-lattice antiferromagnet Sr(TiO)Cu4(PO4)4
• Quantum spin liquids by geometric lattice design
• Electronic and magnetic properties of (1 1 1)-oriented CoCr2O4 epitaxial thin film