The crystal and magnetic structure of solid solutions La0.70Sr0.30MnO3-γ has been investigated by neutron diffraction at different temperatures. Found that the magnetic structure varies depending on the concentration...
详细信息
The crystal and magnetic structure of solid solutions La0.70Sr0.30MnO3-γ has been investigated by neutron diffraction at different temperatures. Found that the magnetic structure varies depending on the concentration of oxygen vacancies. These data confirm the theory of the formation of the magnetic phase state in Sr-substituted anion-deficient manganites, whereby in the absence of orbital ordering reduction in coordination of magnetic ions leads to a change in sign of the indirect superexchange interactions Mn3+-O-Mn3+. We discuss the most probable mechanism of formation of the magnetic ordering in Sr-substituted anion-deficient manganites.
A search for the doubly charmed baryon ■^+cc is performed through its decay to theΛ^+c K^-π^+ final state,using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7,8 and 13...
详细信息
A search for the doubly charmed baryon ■^+cc is performed through its decay to theΛ^+c K^-π^+ final state,using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7,8 and 13 *** data correspond to a total integrated luminosity of 9 fb^-*** significant signal is observed in the mass range from 3.4 to 3.8 GeV/c^*** limits are set at 95%credibility level on the ratio of the ■^+cc production cross-section times the branching fraction to that ofΛ^+c and ■^++cc *** limits are determined as functions of the ■^+cc mass for different lifetime hypotheses,in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 4 to 15 GeV/c.
暂无评论