Coexistence of ferromagnetism and superconductivity in Cu-rich lanthanum Cu-oxides

Simultaneous Structural and Optical Control of Tungsten Oxide (WO3) Nanoparticles through Cobalt Doping for Super Conducting Applications

“…It is well known that, stoichiometric tungsten oxide will exhibit dia magnetic behavior at room temperature. Interestingly, The present parent compound exhibits the co existence of both dia and ferromagnetic behavior [23]. It is attributed to the fact that the in homogeneity in holes density due to the lack of oxygen (W17O47) which gives rise to the unpaired electrons in holes rich region enhanced the ferromagnetic behavior in addition with the dia magnetic nature.…”

Synthesis and Magnetic Characterization of La_2-<i>_x</i>Sr<i>_x</i>CuO₄ Nanoparticles

“…The existence of room temperature ferromagnetism has been observed in YBa2Cu3O7 (YBCO) nanoparticles [2]. B-R. Zhao et al [3] have investigated the evolution of magnetic hysteresis loops at low temperatures in the Cu-rich La2CuO4+δ suggesting the coexistence of superconductivity and ferromagnetism below the superconducting (SC) transition temperature, Tc, ~34 K. They concluded that this coexistence occurs in cluster (particle) sizes smaller than 150 nm. Besides, it has been suggested that La2-xSrxCuO4 (LSCO) exhibits electronical phase separation into SC and normal state regions in both underdoped and overdoped regimes as reported in Ref.…”