Spin polarization and magnetic dichroism in photoemission from core and valence states in localized magnetic systems. II. Emission from open shells

1993 ◽  
Vol 48 (1) ◽  
pp. 210-223 ◽  
Author(s):  
Gerrit van der Laan ◽  
B. T. Thole
Keyword(s):  
Spin Polarization ◽  
Magnetic Systems ◽  
Open Shells ◽  
Valence States ◽  
Magnetic Dichroism

Magnetic Dichroism in Resonant Photoemission and Photoabsorption from Gd Metal

1997 ◽  
Vol 475 ◽  
Author(s):  
K. Starke ◽  
G. Van Der Laan ◽  
Z. Hu ◽  
E. Arenholz ◽  
E. Navas ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Giant Resonance ◽  
High Surface ◽  
Magnetic Systems ◽  
X Ray ◽  
Resonant Photoemission ◽  
Excitation Region ◽  
Magnetic Dichroism ◽  
Consistent Picture ◽  
X Ray Absorption

ABSTRACTWe report on the study of MCD in resonant PE, using Gd metal as an example. When the photon energy is changed across the Gd 4d → 4ƒ excitation region, the PE-MCD spectrum varies substantially. Based on atomic-multiplet theory, we present a consistent picture of MCD in resonant 4d → 4ƒ PE and x-ray absorption at the 4d-edge, where all spectral changes can be explained by the angular-momentum of the intermediate absorption state. The present analysis shows: when tuning to a specific line of the 4d x-ray absorption spectrum with a total angular momentum J', only the associate multiplet component is found to resonate. At the ‘giant resonance’, the shape of the MCD-PE signal closely resembles the off-resonance case; this finding is explained within atomic-multiplet theory allowing a straightforward use of MCD in 4d-resonant PE (i) for element-specific analysis of multicomponent magnetic systems with high surface sensitivity and (ii) for surface-domain imaging by PE microscopy.

scholarly journals High-temperature superconductivity and its robustness against magnetic polarization in monolayer FeSe on EuTiO3

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Chong Liu ◽  
Hyungki Shin ◽  
Andrin Doll ◽  
Hsiang-Hsi Kung ◽  
Ryan P. Day ◽  
...  
Keyword(s):  
Spin Polarization ◽  
High Temperature Superconductivity ◽  
Photoemission Spectroscopy ◽  
Antiferromagnetic Order ◽  
Unconventional Superconductivity ◽  
X Ray ◽  
Nematic Ordering ◽  
Magnetic Dichroism ◽  
Close Proximity ◽  
Enhanced Superconductivity

AbstractSpin degree of freedom generally plays an important role in unconventional superconductivity. In many of the iron-based compounds, superconductivity is found in close proximity to long-range antiferromagnetic order, whereas monolayer FeSe grown on SrTiO3, with enhanced superconductivity, exhibits no magnetic or nematic ordering. Here we grow monolayer and multilayer FeSe on antiferromagnetic EuTiO3(001) layers, in an effort to introduce a spin polarization in proximity to the superconductivity of FeSe. By X-ray magnetic dichroism, we observe an antiferromagnet–ferromagnet switching on Eu and Ti sites in EuTiO3 driven by the applied magnetic field, with no concomitant spin polarization on the Fe site of FeSe. Transport measurements show enhanced superconductivity of monolayer FeSe on EuTiO3 with a transition temperature of ~30 K. The band structure revealed by photoemission spectroscopy is analogous to that of FeSe/SrTiO3. Our work creates a platform for the interplay of spin and unconventional superconductivity in the two-dimensional limit.

INFLUENCE OF PHOTOELECTRON DIFFRACTION ON MAGNETIC LINEAR DICHROISM

1997 ◽  
Vol 04 (05) ◽  
pp. 915-918 ◽  
Author(s):  
H. B. ROSE ◽  
T. KINOSHITA ◽  
CH. ROTH ◽  
F. U. HILLEBRECHT ◽  
E. KISKER
Keyword(s):  
Spin Polarization ◽  
Linear Dichroism ◽  
Emission Angle ◽  
Orbit Interaction ◽  
Strong Variation ◽  
Angular Variation ◽  
Photoelectron Diffraction ◽  
Magnetic Dichroism ◽  
Linearly Polarized ◽  
Magnetic Linear Dichroism

We studied the influence of photoelectron diffraction on magnetic linear dichroism and spin polarization in Co and Fe 3p photoemission excited by linearly polarized synchrotron radiation. We find a strong variation of the magnetic linear dichroism with emission direction. The spin polarization related to the spin–orbit interaction varies in a similar manner. This angular variation closely tracks that of the magnetic dichroism. In contrast, the exchange-induced spin polarization (-12+2)% does not vary appreciably with emission angle. These findings suggest that the main cause for the observed effects is the angular momentum character of the photoelectron wave.

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