Formation of Magnetic Microphases in Ca${}_3$Co${}_2$O${}_6$

Abstract

We study a frustrated quantum Ising model relevant for Ca${}_3$Co${}_2$O${}_6$ that consists of a triangular lattice of weakly-coupled ferromagnetic (FM) chains. According to our quantum Monte Carlo simulations, the chains become FM and form a three-sublattice "up-up-down" structure for $T\le T_{\text{CI}}$. In contrast, long-period spin-density-wave (SDW) {\it microphases} are stabilized along the chains for $T_{\text{CI}}<T<T_c$. Our mean field solutions reveal a quasi-continuous temperature dependence of the SDW wavelength, implying the existence of metastable states that explain the very slow dynamics observed in Ca${}_3$Co${}_2$O${}_6$. We also discuss implications of microphases for the related multiferroic compounds Ca${}_3$CoMnO${}_6$ and Lu${}_2$MnCoO${}_6$.

accepted for publication in PRL; 5 pages, 6 figures

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Cited by in corpus (9)

• Origin of Ising magnetism in Ca3Co2O6 unveiled by orbital imaging
• Magnetic inhomogeneity on a triangular lattice: the magnetic-exchange versus the elastic energy and the role of disorder
• Reaching the equilibrium state of frustrated triangular Ising magnet Ca3Co2O6
• Nanoscale degeneracy lifting in a geometrically frustrated antiferromagnet
• Noise-Robust Detection of Quantum Phase Transitions
• Peculiar magnetic dynamics across the in-field transition in Ca3Co2O6
• Magnetic field-induced deformation of the spin-density wave microphases in Ca${}_3$Co${}_2$O${}_6$
• Bond-dependent interactions and ill-ordered state in the honeycomb cobaltate BaCo${}_2$(AsO${}_4$)${}_2$
• Three-dimensional ferrimagnetic ground state of triangular-lattice system Ca3Co2O6