Frustrated magnetism and dynamical properties in pyrochlore-type magnet Dy2Ti2−xFexO7

• Published in: Journal of magnetism and magnetic materials Vol. 369; pp. 107 - 113
• Main Authors: Liu, Hui, Zou, Youming, Ling, Langsheng, Zhang, Lei, Tong, Wei, Zhang, Changjin, Zhang, Yuheng
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2014; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical-point effects, specific heats, short-range order; Crystalline electric field; Domain effects, magnetization curves, and hysteresis; Doped spin ice; Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.); Exact sciences and technology; Frustrated magnetism; Magnetic properties and materials; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physics; Spin dynamics; Spin dynamics; Crystalline electric field; Frustrated magnetism; Doped spin ice; Curie point; Magnetization; Impurity density; XANES; Doping; Curie-Weiss law; Ferromagnetic materials; Dynamic properties; Spin ice; Pyrochlore type compound; Solidification; Magnetic susceptibility; Monocrystals; Dysprosium Titanates; Short-range interactions; Iron additions; Exchange interactions
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2014.06.031

We have studied the magnetic and dynamical properties of spin-frustrated magnet Dy2Ti2−x FexO7 single crystals. Bulk magnetization data of the heavily Fe doped samples give a negative Curie–Weiss temperature, probably suggesting the existence of short-range antiferromagnetic interaction in Fe-doped samples. Dynamical analyses show that the doped system still freezes into an ice-like state but it is more dynamical than that in pure spin ice Dy2Ti2O7. Furthermore, the dynamic freezing of the spins is suppressed to lower temperatures, which is caused by the Dy-Fe spin interactions and the altered crystalline electric field. It is also found that the coordination number of Fe decreases at high doping level (x=0.15), leading to the change of the spin state of Fe3+. •Doped system Dy2Ti2−xFexO7 still freezes into an icelike state.•Doped system is more dynamical than that in pure spin ice Dy2Ti2O7.•The dynamic freezing of the Dy3+ spins is suppressed to lower temperatures.•The spin configuration of Fe3+ becomes high-spin state at high doping level.