k-dependent electronic structure of the colossal magnetoresistive perovskiteLa0.66Sr0.34

Abstract

We present the first angle-resolved photoemission spectroscopy (ARPES) results on three-dimensional manganese perovskite La 0.66 Sr 0.34 MnO 3. In contrast to ARPES results on layered manganites, a finite and k-dependent spectral weight at the Fermi level was observed. We propose a complex energy band to describe the low binding energy electronic states, which may result from the temporally dynamic orbital orientation distributions and/or nanoscale charge inhomogeneities, to account for the anomalously broad ARPES features observed in the measurements. Flat sections of the Fermi surface were determined. A density wave resulting from nesting instabilities induced by the flat Fermi surface sections is manifested by the energy band folding.

Electronic structure ofLaNiO3−x: Anin situsoft x-ray photoemission and absorption study

“…13,14,15 Previous PES studies on the electronic structure of RNO have all been carried out on polycrystalline samples and a scraping procedure was used to obtain fresh surfaces. 10,11,12 Furthermore, while it is extremely difficult to grow single crystals of the RNO series, the growth of epitaxial films of RNO for use in device applications is known.…”

Three-dimensional dispersion induced by extreme tensile strain inLa2−xSrxCuO4films

“…For the fit, we have chosen an inner potential 13 ͑including the work function͒ V 0 = + ͉E 0 ͉ in the interval 10-14 eV, in agreement with the values found in the literature for similar oxides. 14,16 Both V 0 and m * were adjusted during the fitting procedure, converging to 13 eV and 1.38m e , respectively.…”

Influence of A-site cation size-disorder on structural, magnetic and magnetocaloric properties of La0.7Ca0.3−xKxMnO3 compounds

“…Doped rare-earth manganites with the general formula R 1−x A x MnO 3 (R = La, rare-earth, A = Ca, Sr, Ba) have been recently the subject of intense research not only for their colossal magnetoresistance (CMR) effects but also for the large magnetocaloric effects that certain ferromagnetic manganites exhibit [1][2][3][4][5]. As a function of temperature, applied magnetic field, doping concentration x, A-site ionic radius r A , and Asite size-disorder, this system displays a rich phase diagram for both structural and magnetic properties.…”