Li adsorption on isoreticular MOFs with metal Fe, Cu, Co, Ni and Zn was studied using density function theory. Li functionalization shows a considerable structural change associated with a volume change in isoreticular MOF-5 except for the Zn metal center. Hydrogen binding energies on Li functionalized MOFs are seen to be in the range of 0.2 eV, which is the desired value for an ideal reversibl...

The origin of the martensitic transition in the magnetic shape memory alloy Ni-Mn-Ga has been widely discussed. While several studies suggest it is electronically driven, the adaptive martensite model reproduced the peculiar nonharmonic lattice modulation. We used femtosecond spectroscopy to probe the temperature and doping dependence of collective modes, and scanning tunneling microscopy revea...

An unusual quasi-two-dimensional heavy band mass van Hove singularity (vHs) lies very near the Fermi energy in MgCNi3, recently reported to superconduct at 8.5 K. This compound is strongly exchange enhanced and unstable to ferromagnetism upon hole doping with approximately 12% Mg-->Na or Li (i.e., 0.04 hole/Ni). We identify an essentially infinite mass along the M-Gamma line, which accounts for...

We have performed Electron Spin Resonance measurements on single crystals of the doped spin-Peierls compounds CuGe1−ySiyO3 and Cu1−xMxGeO3 with M = Zn, Mg, Ni (x, y ≤ 0.1). The first part of our experiments was performed in the paramagnetic and spin-Peierls phases at 9.5, 95 and 190 GHz. All non-magnetic impurities (Si, Zn and Mg) were found to hardly affect the position and linewidth of the si...

The recent observation of superconductivity in infinite-layer nickelates has brought intense debate on the established knowledge unconventional based cuprates. Despite many similarities, differ from cuprates characteristics, most notable which is magnetism. Instead a canonical antiferromagnetic (AFM) Mott insulator as undoped cuprates, generally believed to arise upon doping, show no sign magne...

Ž . The ab-plane optical reflectance of single crystal of Bi Sr Ca Cu Ni O , for xs0.0215, has been measured 2 2 1yx x 2 8qd y1 Ž . from 80 to 40 000 cm 10 meV–5 eV and at temperatures between 20 and 300 K. Through Ni substitution, the optical conductivity shows a broad peak at about 400 cm, which grows in intensity and shifts to lower frequency as the temperature is reduced. We suggest that th...