Dielectric anomalies and magnetodielectric coupling behavior of single crystalline Ca3Co2O6, a geometrically frustrated magnetic spin-chain system

Content Provider	Semantic Scholar
Author	Basu, Tathamay Iyer, K. R. Krishna Paulose, P. V. Sampathkumaran, E. V.
Copyright Year	2016
Abstract	The dielectric behavior of the single crystals of the spin-chain system Ca3Co2O6, undergoing geometrically frustrated antiferromagnetic ordering below 25 K, has been investigated as a function of temperature and magnetic field (H) and compared with magnetization (M) behavior. The results provide evidence for anisotropic magnetodielectric (MDE) coupling in this compound. Ac susceptibility exhibits a strong frequency dependence for H parallel c with changes of this feature with the application of external dc magnetic field. No feature in ac susceptibility could be observed for H perpendicular c, thereby providing evidence for strong anisotropic spin-glass behavior. Interestingly, the strong frequency dependence in dielectric is present for both the crystallographic directions (E parallel c and E perpendicular c where E is the electric field) with a negligible influence of H, despite the existence of MDE coupling. This result appears to suggest different dynamics of electric dipole and spin-glass, although they are coupled with each other. In addition, interestingly, there is also a step at one-third of high-(magnetic) field value of MDE at some temperatures tracking a similar step in M(H). This work also confirms following unusual features reported on polycrystals, when measured along c-axis. The dielectric constant exhibits a broad peak around 50-130 K when the electric field is applied along the spin-chain (crystallographic c direction); however this feature is essentially absent for the perpendicular orientation. This finding supports the role of incipient spin-chain ordering to induce magnetodielectric coupling. There is a signature of magnetoelectric phase coexistence when the magnetic field is applied along the spin-chain irrespective of the direction of applied electric field.
Starting Page	364
Ending Page	369
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1016/j.jallcom.2016.03.097
Alternate Webpage(s)	https://arxiv.org/pdf/1603.05055v1.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.jallcom.2016.03.097
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article