Masaki Fujita

Magnetic Ground State of Pr0.89LaCe0.11CuO4+α-δ with Varied Oxygen Depletion Probed by Muon Spin Relaxation

The magnetic ground state of an electron-doped cuprate superconductor, Pr 1- x LaCe x CuO 4+α-δ ( x =0.11, α≃0.04), has been studied by means of muon spin rotation/relaxation (µSR) over a wide vari...

Experimental uncertainty in the far-infrared reflectivity of uniaxial superconductors

Most of the recently discovered superconductors, like all cuprates, MgB2, or NaxCoO2∙nH2O, are uniaxial crystals with metallic ab planes orthogonal to an insulating, or sometimes poorly conducting, c axis. The reflectivity Rab(omega) provides, through the optical conductivity sigmaab(omega), valuable information on the low-energy electrodynamics of these intriguing materials. However, in the far infrared, Rab(omega) ~ or = 1 and a slight contamination from the c-axis response or an unsuitable choice of the extrapolation to omega=0 may lead to large errors on sigmaab(omega). These issues are quantitatively discussed here with particular regard to La2−xSrxCuO4+y, one of the most-studied high-Tc materials.Most of the novel superconductors are uniaxial crystals, with metallic planes (

Magnetic excitations in the spin-glass phase of La2−xSrxCuO4

ab

A comparative study on the magnetic order in hole- and electron-doped high-Tc cuprates

) orthogonal to an insulating axis (

Elastic constant of the vortex lattice in La1.875Ba0.065Sr0.060CuO4

c

Superconducting phase diagram of La2−xSrxCuO4 studied using single crystals with Sr-concentration gradient

). Far-infrared measurements of the reflectivity

Crystalline anisotropy in electron-doped superconductor Pr0.9LaCe0.1CuO4

R_{ab} (\omega)

Elastic magnetic signals in the superconducting La2-xSrxCuO4

provide valuable information on their low-energy electrodynamics, but involve delicate experimental issues. Two of them are a possible contamination of

Water-Soluble Anionic POSS-Core Dendrimer: Synthesis and Copper(II) Complexes in Aqueous Solution

R_{ab} (\omega)

Synthesis of sulfur-containing hyperbranched polymers by the bisthiolation polymerization of diethynyl disulfide derivatives

from the c axis and the extrapolation of the