Objective
The essence of the project is to use the local methods (NMR, NQR, ESR) for obtaining a more detailed knowledge about the pliarities of low energy magnetic excitations in high-Tc cuprates and related compounds, and, particularly, for clarifyng the role of intrinsic local inhomogeneities (effects of electron phase separation, charge-density-waves, polarons, etc.) in these materials. The principal goal of the research is to discover the physical origin of the specific characteristic features of the layered superconducting systems.
We propose to study the following six topics:
modifications of the shape of the plane Cu(2) NQR spectra in 123 and 124 compounds at temperatures around Tc and T* (Zuerich, Kazan);
physical origin of the nuclear (Cu, Tm) and electron (Gd) spin relaxation in 123 and 124 compounds around and below Tc (Zuerich, Kazan, Moscow);
microphase separation and low energy excitations in 123 compounds at low temperatures by using the Cu(2) NMR, Tm NMR, and Gd 3+ ESR (Paris, Kazan, Moscow);
spin dynamics in 123 and 124 compounds at ultralow temperatures by using the Cu NQR and Tm NMR (Paris, Kazan);
microsegregation of doped holes and stripe phase formation in lanthanum cuprates and nickelates by using the La NQR and NMR (Leiden, Kazan);
singlet-correlated motion of oxygen holes (theory, Zuerich-Kazan). Four of the five teams (Paris, Zuerich, Leiden, Kazan) have experience both in experimental and theoretical cooperation for a long time
each of the items 1-6 above will result in (at least) one scientific paper. The results of the investigations will be also presented at scientific conferences and used for education of students in our four universities.
Topic(s)
Data not availableCall for proposal
Data not availableFunding Scheme
Data not availableCoordinator
91405 Orsay
France