The dynamic and static magnetic properties of La1.85Sr0.15Cu1-yNiyO4 with Ni concentration up to y=0.63 are reported. All the features that characterize the spin-glass (SG) behavior are found: bifurcation of the dc susceptibility $\chi${} versus temperature curve, a peak in the zero-field-cooling branch of this curve accompanied by a step in the imaginary part of the ac susceptibility $\chi${}ac, frequency dependence of the peak position in the real part of $\chi${}ac, and scaling behavior. The decay of remanent magnetization is described by a stretched-exponential function. The characteristic time from the critical slowing-down formula that governs the dynamics of the system suggests the existence of the spin clusters. The strongest interactions between the fluctuating entities are at y equal to the charge-carrier concentration in the system. The SG transition temperature decreases linearly with decreasing y for y$\leqslant${}0.30 and extrapolates to 0 K at y=0, which means that Ni displays a magnetic character in the surrounding Cu-O network starting from the smallest concentration y. The static critical exponents characterizing the scaling behavior of the nonlinear part of $\chi${} lie between those typical for three-dimensional Ising-like and Heisenberg-like systems.

Oxide multilayers composed of ferromagnetic metallic layers of ${\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_3$ (LSMO) and superconducting cuprate ${\mathrm{YBa}}_2{\mathrm{Cu}}_3{\mathrm{O}}_7$ (YBCO) were grown on (1 0 0) ${\mathrm{LaAlO}}_3$ substrates by high-pressure dc sputtering. We have investigated structural, transport, and magnetic properties of a series of samples in which the layer thickness of LSMO is fixed at 16 unit cells and that of YBCO varied from 1 to 8 unit cells. Exchange-induced unidirectional anisotropy in LSMO/YBCO superlattices has been demonstrated. Observation of an exchange biasing effect in LSMO/YBCO superlattices supports an existence of interlayer exchange coupling between LSMO layers through YBCO superconducting spacer layers.

We present angle-resolved photoemission spectroscopy measurements of the surface states on in-situ grown (111) oriented films of Pb${}_{1-x}$Sn${}_x$Se, a three-dimensional topological crystalline insulator. We observe surface states with Dirac-like dispersion at $\overline{\Gamma }$ and $\overline{M}$ in the surface Brillouin zone, supporting recent theoretical predictions for this family of materials. We study the parallel dispersion isotropy and Dirac-point binding energy of the surface states, and perform tight-binding calculations to support our findings. The relative simplicity of the growth technique is encouraging, and suggests a clear path for future investigations into the role of strain, vicinality, and alternative surface orientations in (Pb,Sn)Se solid solutions.