Anisotropic magnetodielectric coupling behavior of Ca3Co1.4Rh0.6O6 due to geometrically frustrated magnetism

Abstract

We have investigated the magnetic, dielectric and magnetodielectric (MDE) behavior of a geometrically frustrated spin-chain system, Ca3Co1.4Rh0.6O6, in the single crystalline form for different orientations. The results bring out that the magnetic behavior of this compound is by itself interesting in the sense that this compound exhibits an anisotropic glassy-like magnetic behavior with a huge frequency dependence of ac susceptibility peak for an orientation along the spin-chain in the range 30-60 K; this behavior is robust to applications of large external magnetic fields (H) unlike in canonical spin-glasses. The temperature dependence of dielectric constant also shows strong frequency dependence with similar robustness to H. The isothermal H-dependent dielectric results at low temperatures establishes anisotropic MDE coupling. It is intriguing to note that there is a 'step' roughly at one-third of saturation values as in the case of isothermal magnetization curves for same temperatures (for orientation along spin-chain), a correlation hitherto unrealized for geometrically frustrated systems.

arXiv commentApplied Physics Letters, in press. Supplementary Material is included

References in corpus (10)

• X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6
• Superparamagnetic-like ac susceptibility behavior in a "partially disordered antiferromagnetic" compound, Ca${}_3$CoRhO${}_6$
• Magnetodielectric coupling in a triangular Ising lattice
• Specific heat investigation of the magnetic ordering in two frustrated spin-chain oxides: Ca3Co2O6 and Ca3CoRhO6
• Evidence for the coexistence of low-dimensional magnetism and long-range order in Ca3CoRhO6
• An insight into spin-chain magnetism through Moessbauer spectroscopic investigations in Eu-doped Ca3Co2O6 and Ca3CoRhO6
• Insulating state and the importance of the spin-orbit coupling in Ca${}_3$CoRhO${}_6$
• Effect of a small disruption of the Ca site on the geometrically frustrated magnetic behavior of Ca3CoRhO6
• Stability of geometrically frustrated magnetic state of Ca3CoRhO6 to applications of positive and negative pressure
• Magnetic anomalies in nanocrystalline Ca3CoRhO6, a geometrically frustrated spin-chain compound,

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• Role of crystal field ground state in the classical spin-liquid behavior of a quasi-one dimensional spin-chain system Sr3NiPtO6
• Magnetic ground state and excitations in mixed 3$d$-4$d$ quasi-1D spin-chain oxide Sr${}_3$NiRhO${}_6$