体超导铟对一维锌超导纳米线超导电性的抑制效应

文章细致研究了超导体铟／一维锌超导纳米线阵列／超导体铟夹心结构的超导电性．实验发现，当锌纳米线的长度在2—6μm、直径等于40nm时，宏观尺寸的超导体铟电极对中间的锌纳米线的超导电性具有反常的抑制作用,即当铟处在超导态时，中间的锌纳米线则停留在正常态．如果施加一个磁场，使超导体铟电极变为正常态，锌纳米线则恢复其超导电性，这种奇异的现象与超导电极材料的类型及锌纳米线的直径和长度有关。     

Mössbauer parameters of a highly anisotropic low-spin ferric compound: Bis[tris(N-methylimidazol-2-yl) hydroxymethane] ferrate (III) tetrafluoroborate

We have analyzed the Mössbauer spectra of a highly anisotropic low-spin ferric compound, [Fe(TICOH)₂](BF₄)₃, taken in frozen solution as a function of temperature and field. Unlike other low-spin ferric compounds, [Fe(TICOH)₂](BF₄)₃ shows a sharp six-line pattern with an overall s;litting of 14.2 mm/s in an applied field at 4.2 K. Good simulations are obtained using the model of Oosterhuis and Lang with a crystal field of axial symmetry. At higher temperature spin fluctuations become important, and a dynamic lineshape model with temperature- and field-dependent relaxation rates is used to simulate the data.     

Singular nonlinear equations on an unbounded interval

Variational methods and the critical point theory of Lusternik and Schnirelman are used to prove two abstract theorems. These theorems are utilized to obtain the existence of multiple solutions for a class of nonlinear, singular second order equations on (0, ∞).     

Properties of the X 1Σ state of BF

A perturbation theoretical approach for treating electron correlation has been used to calculate the potential energy curve and dipole moment function of BF near its equilibrium bond length. A dipole moment of 0.89 D (B^?F⁺) is predicted at R_e. When the bond is stretched by ≈0.2 Å the dipole reverses sign.