Search academic texts

Information × Registration Number 0220U101340, 0118U100342 , R & D reports Title Newest magnetic systems with strong connection between electrical, magnetic and structural properties and ways to control their functional capabilities popup.stage_title Head Gnezdilov Volodymyr P., Доктор фізико-математичних наук Registration Date 10-02-2020 Organization B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine popup.description2  A comprehensive study of a number of materials that are promising for the latest technological applications has been carried out. A number of new scientific results have been obtained: • In the firstly synthesized S = ½ spin-chain compound KCu(IO3)3, it was observed that the wide range between the magnetic (TN = 1.3 K) and the Jan-Teller (TJT = 175 K) transitions is characterized by disproportionate dimer orbital ordering and a large the level of spin fluctuations. • For the first time in Fe2O(SeO3)2, an antiferromagnet with saw-like spin chains and in Mn2OBO3, an antiferromagnet with one-dimensional ribbon-structure, an unusual separation of magnetic modes, including flat, non-dispersive, has been detected and studied. This property is most important for the probable future use of such compounds in magnonic devices. • Phonon and electron excitations were investigated and theoretically analyzed for the first time using Raman scattering in the PdGa Weyl semimetal, which is promising for use in high-speed electronics devices. • For the first time the mechanisms of realization of crossover processes of change of the ground spin state of Co3+ in perovskites RCoO3 (R = La1-xPrx) have been experimentally investigated and theoretically explained. • For the first time, Raman studies of a quasi-two-dimensional MnPS3 antiferromagnet with hexagonal arrangement of magnetic atoms in layers was carried out. This magnetic structure is promising due to the quantum effects that can be used in modern electronics devices. • A number of new theoretical models have been constructed regarding the mechanisms of formation of ground states and excitation spectra of magnets of different dimensions and with different topology and hierarchy of exchange interactions. The results of the work are important, because significant new scientific information of fundamental and applied value is obtained, which will contribute to the improvement of modern technologies. Product Description popup.authors popup.nrat_date 2020-04-02 Close