Papers by Keyword: Antiferromagnet

Abstract: This paper reports the synthesis and magnetic properties of single phase FeTiO₃ nanoparticles. Ilmenite nanoparticles are prepared through coprecipitation method. As prepared powder is amorphous in nature. When annealed inair and inert atmosphere, we get almost single phase pure crystalline FeTiO₃. Our results show that FeTiO₃ in nanocrystalline form behaves like a weak ferromagnet below ~50 K while it is known that ilmenite is an antiferromagnet below ~55 K.

Abstract: LiCrO₂ is a triangular lattice antiferromagnetic compound exhibiting geometrically frustrated two dimensional arrangement of Cr ions with T_N = 62 K at which an isostructural transition occurs. We show, using temperature dependent high energy synchrotron X-ray diffraction studies, that upon a nominal 1% Cu doping at the Li site, there are large changes in structural parameters and the (coupled) magnetic and dielectric properties.

Abstract: Many quantum optical and optoelectronic achievements have been obtained by using quantum coherence effects occurred in four-level quantum systems. Here we report a systemic study on the 1^st, 2^nd and 3^rd order subschemes of the four-level scheme with the aid of Boolean algebra, and find 7 1^st order subschemes and 53 2^nd order subschemes in total. Further it is found that 472 3^rd-order subschemes may appear in the realistic optical quantum coherence experiments when the applied lasers are distinguished only by the strong and weak field intensities.

Abstract: The low temperature (T) Raman spectroscopic study on the geometrically frustrated clinoatacamite γ-Cu₂(OH)₃Cl is reported. By measuring the T-dependent spectral profiles and representative modes, we have obtained auxiliary evidence of successive magnetic transitions near T_c1 =18.1 K and T_c2 =6.4 K determined accurately by the magnetic experiments in the Raman band frequencies and peak widths of the representative modes for magnetic research conclusions and observed a pronounced Raman spectroscopy background featuring a broad continuum at all Ts. A quantitative analysis reveals spin fluctuations on a picosecond time scale in the intermediate phase.

Abstract: We present results of specific heat and magnetic susceptibility measurements as function of temperature and magnetic field on the rare-earth compound CePd3In2. Known to order antiferromagnetic below 2.1 K, we discuss the influence of magnetic field on the stability of the magnetic order.