Cel The objective of the project is to promote a new class of materials for a wide scientific exploration and potential technical applications, the high rare earth borides, REB_x (x=6,12). These cubic systems possess outstanding mechanical and chemical strength due to the framework of boron atoms. In these simple structures the magnetic moments of RE ions undergo antiferromagnetic ordering at low temperatures and the establishing of complex (T,H) phase diagrams provides an opportunity to investigate the nature of their ordering. Moreover, there is a possibility to control their electronic properties. By these means, high borides are promising materials to be used as sensors or controlling elements with outstanding durability. However, despite of scientific interest and the potential of technical applications, they have not been adequately investigated due to a lack of high quality samples.In these borides the parameters of crystal electric field (CEF), which is generated by nearest-neighbour boron atoms, and the conditions for indirect interactions between magnetic RE moments are only weakly affected by a substitution of RE ions. This provides a possibility to use these borides with a wide set of RE ions with different values of magnetic moments and CEF splitting - to tune various mechanisms of interactions. By these means a hierarchy of interactions between moments can be established and adequate theoretical models can be put forward. Moreover, there are no reliable quantitative theories available, neither for the basic RKKY interaction nor for CEF in real systems.To achieve the goals in the project it is proposed to:- Produce high quality samples of magnetic REB_x borides, together with analogous reference nonmagnetic ones;- Study the crystal and magnetic phases by X-ray and neutron diffraction, which will provide fundamental input data for all further investigations;- Investigate band structures of itinerant electrons by means of ab initio calculations, and by the dH-vA effect and magnetoresistivity; this will provide microscopic parameters for interactions, and provide trends and criteria of stability for different moment arrangements;- Study high-field magnetization, heat capacity, conductivity and neutron scattering in order to establish the phase diagrams, the structure of ground and excited states of RE ions and the energy of CEF splitting;- Employ thermal and elastic properties, magnetostriction, and point-contact spectra in order to learn details about interactions between different quasiparticles: electrons, phonons, magnons.As a whole, the results will provide a consistent picture of magnetic interactions in REB_x compounds, and allow to put forward new theoretical models suitable also for other RE compounds. It is expected to deduce also knowledge related to production and applications of these systems.Finally, the training of young scientists and the NIS - INTAS cooperation are values of its own for the European Research Area. Program(-y) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Temat(-y) OPEN - OPEN Call Zaproszenie do składania wniosków Data not available System finansowania Data not available Koordynator Slovak Academy of Sciences Institute of Experimental Physics Wkład UE Brak danych Adres Watsonova 47 04353 Kosice Słowacja Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (6) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko Hahn Meitner Institute Berlin Niemcy Wkład UE Brak danych Adres Glienicker Str 100 D 14109 Berlin Zobacz na mapie Koszt całkowity Brak danych Polish Academy of Sciences Institute of Low Temperature Physics and Structure Research Polska Wkład UE Brak danych Adres Okólna 2 50-422 Wroclaw Zobacz na mapie Koszt całkowity Brak danych RRC Kurchatov Institute/Institute of Superconductivity and Solid State Physics Rosja Wkład UE Brak danych Adres Kurchatov sq. 123182 Moscow Zobacz na mapie Koszt całkowity Brak danych Russian Academy of Sciences A.M.Prokhorov General Physics Institute of RAS Rosja Wkład UE Brak danych Adres Vavilov 38 119991 Moscow Zobacz na mapie Koszt całkowity Brak danych Ukrainian National Academy of Sciences B.I.Verkin Institute for Low Temperature Physics Ukraina Wkład UE Brak danych Adres Lenin's prospect 47 61103 Kharkov Zobacz na mapie Koszt całkowity Brak danych Ukrainian National Academy of Sciences Institute for Problems of Materials Science Ukraina Wkład UE Brak danych Adres Krzhyzhanovsky 3 03680 Kiev Zobacz na mapie Koszt całkowity Brak danych
