Magnetic phenomena in layered and intercalated compounds

摘要: The intrinsic magnetism of two-dimensional (2D) lattices is fundamental interest and has been the subject intense theoretical studies. These studies have motivated much experimental work on layered intercalated compounds. idea an “effective dimensionality” which can be varied from three to two as inter-layer or inter-intercalate separation increased additional incentive. latter notion mainly product intuitive curiosity since theory little help in guiding our expectation concerning such intermediate dimensionalities. That is, surprizingly known about local moments quasi-2D [which are essentially three-dimensional (3D) with symmetries lower than cubic] compared exactly 2D lattices. Nonetheless, one might expect observe h-T phase diagram that represented Fig. 1 where h T absolute temperature. For example, could c-axis a tetragonal system spins corners square end faces. This hypothetical Open image new window Fig. 1 Hypothetical distance exhibits regions: high temperature paramagnetic (P) phase, some form order stabilized 3D ordered phase. Particular examples meaning somewhat limited usefulness given below. It more consequence, however, admit relation between structure far greater variety (and subtlety) expressed by single parameter h. view stressed illustrated many throughout present paper.