Solid State Physics Laboratory

About: Solid State Physics Laboratory is a facility organization based out in Delhi, India. It is known for research contribution in the topics: Quantum dot & Dielectric. The organization has 1754 authors who have published 2597 publications receiving 50601 citations.

Reversible magnetization of the two-band Mg B 2 superconductor: A phenomenological approach

Abstract: A phenomenological theory of the reversible magnetization of $\mathrm{Mg}{\mathrm{B}}_{2}$ is presented and compared to experimental data. It is based on Ginzburg-Landau theory, but introduces magnetic field-dependent parameters. This field dependence is a natural consequence of the two band nature of $\mathrm{Mg}{\mathrm{B}}_{2}$ and accounts for the varying contribution of the $\ensuremath{\pi}$ band. The model describes the experimental data with one (field-dependent) anisotropy parameter for the penetration depth and for the coherence length.

Effect of hole-induced shakedown in the auger spectrum of lanthanum

Abstract: It is shown from the ${M}_{4}$,5${\mathrm{N}}_{4}$,5X (X=${O}_{1}$,${O}_{2}$,3,${N}_{6}$,7) Auger emissions of La metal, ${\mathrm{La}}_{2}$${\mathrm{O}}_{3}$, and ${\mathrm{LaF}}_{3}$ that the 4f hole pulled down below the Fermi level by the 3d core hole in La metal is significantly populated before Auger decays take place. This extra relaxation mechanism by the ${N}_{4}$,5VV Auger process from conduction electrons gives important contribution to the intensity of the ${M}_{4}$,5${\mathrm{N}}_{4}$,5${\mathrm{N}}_{6}$,7 Auger emission. The amount of this contribution can be calculated by existing theories on the shakeup or shakedown satellites on the La 3d core-level x-ray photoemission spectra (XPS) of these La compounds, and the results are found to be consistent with our experimental data. The criterion for the importance of this hole-induced shakedown process in the initial state of Auger spectra is determined, and the implications of this finding on other spectroscopies are discussed.