Field driven magnetostructural transitions in GeCo${}_2$O${}_4$

Abstract

In the spinel compound GeCo${}_2$O${}_4$, the Co${}^{2+}$ pyrochlore sublattice presents remarkable magnetic field-induced behaviors that we unveil through neutron and X-ray single-crystal diffraction. The Néel ordered magnetic phase is entered through a structural lowering of the cubic symmetry. In this phase, when a magnetic field is applied along a 2-fold cubic direction, a spin-flop transition of one fourth of the magnetic moments releases the magnetic frustration and triggers magnetostructural effects. At high field, these ultimately lead to an unusual spin reorientation associated to structural changes.

References in corpus (11)

• Local spin resonance and spin-Peierls-like phase transition in a geometrically frustrated antiferromagnet
• Half-magnetization plateau stabilized by structural distortion in the antiferromagnetic Heisenberg model on a pyrochlore lattice
• Controlling orbital moment and spin orientation in CoO layers by strain
• Spin-lattice instability to a fractional magnetization state in the spinel HgCr2O4
• Quantum effects in a half-polarized pyrochlore antiferromagnet
• Magnetic frustration in the spinel compounds Ge Co_2 O_4 and Ge Ni_2 O_4
• Structural distortion below the Néel temperature in spinel GeCo${}_2$O${}_4$
• Universal magnetic structure of the half-magnetization phase in Cr-based spinels
• Elastic Instabilities within Antiferromagnetically Ordered Phase in the Orbitally-Frustrated Spinel GeCo${}_2$O${}_4$
• Magnetic Field Induced Transition in Vanadium Spinels
• Spin-orbit coupling inactivity of Co${}^{2+}$ ion in geometrically frustrated magnet GeCo${}_2$O${}_4$

Cited by in corpus (4)

• Hedgehog-lattice spin texture in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice
• Lattice dynamics and magnetic exchange interactions in GeCo2O4, a spinel with S = 1/2 pyrochlore lattice
• Hedgehog lattice and field-induced chirality in breathing-pyrochlore Heisenberg antiferromagnets
• Discovery of new magnetic orders on pyrochlore spinels