Resonant X-ray emission and X-ray absorption spectra of 3d metals in Co2MnZ (, Ga, Sn, Sb) Heusler alloys as an element-selective probe of spin character of valence band

2005 ◽  
Vol 144-147 ◽  
pp. 765-769 ◽  
Author(s):  
M.V. Yablonskikh ◽  
Yu.M. Yarmoshenko ◽  
I.V. Solovyev ◽  
E.Z. Kurmaev ◽  
L.-C. Duda ◽  
...  
Keyword(s):  
Valence Band ◽  
Absorption Spectra ◽  
Heusler Alloys ◽  
X Ray ◽  
3D Metals ◽  
X Ray Absorption

Bulk and Surface Electronic Structure of GaN Measured Using Angle-Resolved Photoemission, Soft X-ray Emission and Soft X-ray Absorption

1996 ◽  
Vol 449 ◽  
Author(s):  
Kevin E. Smith ◽  
Sarnjeet S Dhesi ◽  
Laurent-C. Duda ◽  
Cristian B Stagarescu ◽  
J. H. Guo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Valence Band ◽  
Absorption Spectra ◽  
Conduction Band ◽  
Brillouin Zone ◽  
Emission Spectra ◽  
Partial Density ◽  
High Symmetry ◽  
X Ray ◽  
X Ray Absorption

ABSTRACTThe electronic structure of thin film wurtzite GaN has been studied using a combination of angle resolved photoemission, soft x-ray absorption and soft x-ray emission spectroscopies. We have measured the bulk valence and conduction band partial density of states by recording Ga L- and N K- x-ray emission and absorption spectra. We compare the x-ray spectra to a recent ab initio calculation and find good overall agreement. The x-ray emission spectra reveal that the top of the valence band is dominated by N 2p states, while the x-ray absorption spectra show the bottom of the conduction band as a mixture of Ga 4s and N 2p states, again in good agreement with theory. However, due to strong dipole selection rules we can also identify weak hybridization between Ga 4s- and N 2p-states in the valence band. Furthermore, a component to the N K-emission appears at approximately 19.5 eV below the valence band maximum and can be identified as due to hybridization between N 2p and Ga 3d states. We report preliminary results of a study of the full dispersion of the bulk valence band states along high symmetry directions of the bulk Brillouin zone as measured using angle resolved photoemission. Finally, we tentatively identify a non-dispersive state at the top of the valence band in parts of the Brillouin zone as a surface state.

X-ray Spectroscopic Studies of the Bulk Electronic Structure of InGaN Alloys

2002 ◽  
Vol 743 ◽  
Author(s):  
Cormac McGuinness ◽  
James E. Downes ◽  
Philip Ryan ◽  
Kevin E. Smith ◽  
Dharanipal Doppalapudi ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Band Gap ◽  
Valence Band ◽  
Absorption Spectra ◽  
Conduction Band ◽  
Partial Density ◽  
Significant Shift ◽  
Band Shift ◽  
X Ray ◽  
X Ray Absorption

ABSTRACTSynchrotron radiation excited soft x-ray emission and soft x-ray absorption spectroscopies are applied to the study of the electronic structure of InxGa1-xN alloys with (0 ≤ x ≤ 0.29). The elementally resolved partial density of states of the valence and conduction bands may be measured using these spectroscopies. The x-ray absorption spectra indicate that the conduction band broadens considerably with increasing indium incorporation. The band gap evolution as a function of indium content derives primarily from this broadening of the conduction band states. The emission spectra indicate that motion of the valence band makes a smaller contribution to the evolution of the band gap. This gap evolution differs from previous studies on the AlxGa1-xN alloy system, which observed a linear valence band shift through the series (0 < x < 1). Instead in the case of InxGa1-xN the valence band exhibits a significant shift between x = 0 and x = 0.1 with minimal movement thereafter. Furthermore, evidence of In 4d -N 2p and Ga 3d- N 2p hybridisation is reported. Finally, the thermal stability of an In011Ga089N film was investigated. Both emission and absorption spectra were found to have a temperature dependent shift in energy, but the overall definition of the spectra was unaltered even at annealing temperatures well beyond the growth temperature of the film.

MAGNETIC CIRCULAR DICHROISM IN THE SOFT X-RAY ABSORPTION SPECTRA OF Co-BASED HEUSLER ALLOYS

2002 ◽  
Vol 09 (02) ◽  
pp. 955-960 ◽  
Author(s):  
A. YAMASAKI ◽  
S. IMADA ◽  
S. SUGA ◽  
T. KANOMATA ◽  
S. ISHIDA
Keyword(s):  
Circular Dichroism ◽  
Absorption Spectra ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Heusler Alloys ◽  
Structure Calculation ◽  
Band Structure Calculation ◽  
X Ray ◽  
X Ray Absorption ◽  
Circular Dichroïsm

Magnetic circular dichroism (MCD) of core-level absorption spectra (XAS) in the soft X-ray region has been measured for the ferromagnetic Heusler alloys Co 2 TiSn , Co 2 ZrSn , and Co 2 NbSn . The Co 2p → 3d XAS–MCD spectra show an obvious contribution of the orbital angular momentum component to the magnetic moment in these alloys. The ratio between the orbital and the spin magnetic moments derived from the MCD spectra varies by more than a factor of 2 within these alloys. The mechanism of this variation is discussed in comparison with the band structure calculation.

Electronic Structure and X-ray Absorption Spectra of Rutile TiO2 Using First-Principles Calculations

2014 ◽  
Vol 52 (12) ◽  
pp. 1025-1029
Author(s):  
Min-Wook Oh ◽  
Tae-Gu Kang ◽  
Byungki Ryu ◽  
Ji Eun Lee ◽  
Sung-Jae Joo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Absorption Spectra ◽  
First Principles ◽  
First Principles Calculations ◽  
Rutile Tio2 ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Theoretical description of optical and x-ray absorption spectra of MgO including many-body effects

2021 ◽  
Vol 103 (19) ◽  
Author(s):  
Vijaya Begum ◽  
Markus E. Gruner ◽  
Christian Vorwerk ◽  
Claudia Draxl ◽  
Rossitza Pentcheva
Keyword(s):  
Absorption Spectra ◽  
Theoretical Description ◽  
Many Body ◽  
X Ray ◽  
Many Body Effects ◽  
X Ray Absorption

The changes on sulfur atoms in its compounds, as found from X-ray absorption spectra

1962 ◽  
Vol 3 (3) ◽  
pp. 327-328 ◽  
Author(s):  
R. L. Barinskii ◽  
B. A. Malyukov
Keyword(s):  
Absorption Spectra ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Soft X-ray absorption spectra in the CK region of carbon black and spectral analysis using the discrete variational Xα method

TANSO ◽  
2009 ◽  
Vol 2009 (236) ◽  
pp. 2-8 ◽  
Author(s):  
Yasuji Muramatsu ◽  
Ryusuke Harada ◽  
Muneyuki Motoyama ◽  
Eric M. Gullikson
Keyword(s):  
Spectral Analysis ◽  
Carbon Black ◽  
Absorption Spectra ◽  
X Ray ◽  
X Ray Absorption
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