Objective
It is well established now that copper-oxide high-temperature superconductors are characterized by two distinguished properties, namely, d-symmetry of the superconducting order parameter and normal-state pseudogap observed in the under doped regime. However, these fundamental features have been found experimentally only for hole-doped copper oxides, whereas properties of the electron-doped materials are profoundly different (this phenomenon is called electron-hole asymmetry). It should be emphasized that all the experiments for the electron-doped materials were performed using copper-oxides samples, which are suspected to have defects in the oxygen sublattice. These defects can mask intrinsic properties of the CuO2 planes, such as the normal-state pseudogap as well as signature of the d-wave paring, making thus hardly possible unambiguous interpretation of the results obtained.
The aim of the present project is to perform for the first time experimental study of the electronic state of the electron-doped copper oxides using a new generation of the infinite layer samples Sr1-xRxCuO2 (R=La, Pr; 0 < x < 0.15) electron-doped character of which can be firmly confirmed. The suggested experiments include NMR measurements of the normal-state spin susceptibility, with the focusing on the normal-state pseudogap behaviour in the underdoped regime. Inelastic neutron scattering technique will be employed to search for the crystalline electric field excitations, with the focusing on the local lowering of the space symmetry due to doping of the CuO2 plane with charge carriers as well as on a formation of clusters of undoped, intermediately doped and heavily doped character) frustrated phase separation). Normal-state transport (electrical resistivity, Hall effect, thermopower), structural and magnetic properties in the superconducting state of the infinite-layer compounds under study will also be investigated.
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Programme(s)
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Coordinator
5232 Villigen PSI
Switzerland
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.