The generalized phonon density of states(PDOS)and the valence electron density of states(EDOS)of the amorphous Fe_(90-x)Co_(x)Zr_(10)(x=4,10 and 40)alloys were measured at the room temperature by inelastic neutron-sca...The generalized phonon density of states(PDOS)and the valence electron density of states(EDOS)of the amorphous Fe_(90-x)Co_(x)Zr_(10)(x=4,10 and 40)alloys were measured at the room temperature by inelastic neutron-scattering and x-ray photoemission spectroscopy,respectively.Preliminary results show that the stronger the Invar effect,the softer is the PDOS in the low-energy region and the larger is the EDOS at the Fermi energy level.The enhancement of electron-phonon interaction was suggested to explain the low-energy phonon softening observed in Invar alloys.展开更多
Neutron diffraction aund inelastic scatterilug were curried out on YBa_(2)Cu_(3)O_(7-y)(r=0.5,1.0、1.25).It was coufirmed that the substitutiou of Sr for Ba in YBa_(2)Cu_(3)O_(7-y) inrcases the oxyge1n vacancies int t...Neutron diffraction aund inelastic scatterilug were curried out on YBa_(2)Cu_(3)O_(7-y)(r=0.5,1.0、1.25).It was coufirmed that the substitutiou of Sr for Ba in YBa_(2)Cu_(3)O_(7-y) inrcases the oxyge1n vacancies int the CuO chain.Moreuver.the sntbstittiou strengtlenx the coupling betw1ell the Ba O plane aldl the Cu O rhain,Moreoer. the crystiul stnlbility.Tlusse the ppossill.rnuscs of Te depression for Sr xilrtittril YBa_(2)Cu_(3)O_(7-y).展开更多
Neutron diffraction study on the structure of Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) was carried out.Data refinements show that the average subcell structure for Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) is in the best fit...Neutron diffraction study on the structure of Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) was carried out.Data refinements show that the average subcell structure for Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) is in the best fit of the space group Fmmm and the structure is described by alternate stacking of SrO-CuO_(2)-Ca-CuO_(2)-SrO slab and a double BiO layers.An oxygen layer sandwiched by the bismuth layers was conRrmed.展开更多
文摘The generalized phonon density of states(PDOS)and the valence electron density of states(EDOS)of the amorphous Fe_(90-x)Co_(x)Zr_(10)(x=4,10 and 40)alloys were measured at the room temperature by inelastic neutron-scattering and x-ray photoemission spectroscopy,respectively.Preliminary results show that the stronger the Invar effect,the softer is the PDOS in the low-energy region and the larger is the EDOS at the Fermi energy level.The enhancement of electron-phonon interaction was suggested to explain the low-energy phonon softening observed in Invar alloys.
基金Supported by the National Natural Science Foundation of China。
文摘Neutron diffraction aund inelastic scatterilug were curried out on YBa_(2)Cu_(3)O_(7-y)(r=0.5,1.0、1.25).It was coufirmed that the substitutiou of Sr for Ba in YBa_(2)Cu_(3)O_(7-y) inrcases the oxyge1n vacancies int the CuO chain.Moreuver.the sntbstittiou strengtlenx the coupling betw1ell the Ba O plane aldl the Cu O rhain,Moreoer. the crystiul stnlbility.Tlusse the ppossill.rnuscs of Te depression for Sr xilrtittril YBa_(2)Cu_(3)O_(7-y).
基金Supported by the National Natural Science Foundation of Chinathe National Center for Research and Development on Superconductivity.
文摘Neutron diffraction study on the structure of Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) was carried out.Data refinements show that the average subcell structure for Bi_(2)Sr_(1.855)Ca_(1.145)Cu_(2)O_(8) is in the best fit of the space group Fmmm and the structure is described by alternate stacking of SrO-CuO_(2)-Ca-CuO_(2)-SrO slab and a double BiO layers.An oxygen layer sandwiched by the bismuth layers was conRrmed.
