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Ferromagnetism of thin epitaxial FCC cobalt and FCC iron films on Cu(001) observed by spin-polarized photoemission
A437 Surface Science 189/190 (1987) 741-746 North-Holland, Amsterdam
741
T H E I N F L U E N C E OF A D S O R B A T E S O N T H E S P I N - R E S O L V E D PHOTOEMISSION OF Ni(ll0) W. S C H M I T T ,
K.-P. KAMPER
and G. GONTHERODT
11. Pto,sikalisches Institut, Universitdt zu KOln, 5000 KOln 41, Fed. R~ep. of Gerrnanv Received 8 May 1987; accepted for publication 25 May 1987
The adsorbate systems O ( 2 x l ) and S c(2x2) on Ni(ll0) were investigated by means of spin-resolved photoemission spectroscopy. For the Ni 3d bands with S3 symmetry near the X point of the Brillouin zone no change of the exchange splitting due to adsorption of O and S is found. Depolarization effects of the spin-polarized photoelectrons caused by the adsorbates are interpreted in terms of exchange scattering. Different scattering probabilities for majority- and minority-spin electrons indicate that O and S on Ni(110) are partially polarized parallel to the Ni bulk magnetization.
Surface Science 189/190 (1987) 747-750 North-Holland, Amsterdam
747
SURFACE SEMICONDUCTOR-METAL TRANSITION IN RARE E A R T H H Y D R I D E S AT LOW T E M P E R A T U R E S L. S C H L A P B A C H Laboratorium ]'~tr Festk6rperphysik ETH, CH-8093 Zi~rich, Switzerland
J.P. B U R G E R Unmersit~ Paris-Sua~ UA 803, Hydrog~ne et D~fauts dans les M~taux, Batirnent 350, F-91405 Orsay, France
J.E. B O N N E T ,
P. T H I R Y
a n d Y. P E T R O F F
Laboratoire pour l'Utilisation du Rayonnernent Electromagn~tique, LURE, Bdtirnent 209, F-91405 Orsay, France Received 17 March 1987; accepted for publication 28 April 1987
Using photoelectron spectroscopy we have observed a reversible surface semiconductor-metal transition in hydrides of light and heavy rare earth metals at low temperatures. The reversible diffusion of hydrogen from octahedral-like surface sites into the bulk is thought to push RE 5d states from the hydrogen bonding band back to the conduction band, producing a metallic surface dihydride.
741
T H E I N F L U E N C E OF A D S O R B A T E S O N T H E S P I N - R E S O L V E D PHOTOEMISSION OF Ni(ll0) W. S C H M I T T ,
K.-P. KAMPER
and G. GONTHERODT
11. Pto,sikalisches Institut, Universitdt zu KOln, 5000 KOln 41, Fed. R~ep. of Gerrnanv Received 8 May 1987; accepted for publication 25 May 1987
The adsorbate systems O ( 2 x l ) and S c(2x2) on Ni(ll0) were investigated by means of spin-resolved photoemission spectroscopy. For the Ni 3d bands with S3 symmetry near the X point of the Brillouin zone no change of the exchange splitting due to adsorption of O and S is found. Depolarization effects of the spin-polarized photoelectrons caused by the adsorbates are interpreted in terms of exchange scattering. Different scattering probabilities for majority- and minority-spin electrons indicate that O and S on Ni(110) are partially polarized parallel to the Ni bulk magnetization.
Surface Science 189/190 (1987) 747-750 North-Holland, Amsterdam
747
SURFACE SEMICONDUCTOR-METAL TRANSITION IN RARE E A R T H H Y D R I D E S AT LOW T E M P E R A T U R E S L. S C H L A P B A C H Laboratorium ]'~tr Festk6rperphysik ETH, CH-8093 Zi~rich, Switzerland
J.P. B U R G E R Unmersit~ Paris-Sua~ UA 803, Hydrog~ne et D~fauts dans les M~taux, Batirnent 350, F-91405 Orsay, France
J.E. B O N N E T ,
P. T H I R Y
a n d Y. P E T R O F F
Laboratoire pour l'Utilisation du Rayonnernent Electromagn~tique, LURE, Bdtirnent 209, F-91405 Orsay, France Received 17 March 1987; accepted for publication 28 April 1987
Using photoelectron spectroscopy we have observed a reversible surface semiconductor-metal transition in hydrides of light and heavy rare earth metals at low temperatures. The reversible diffusion of hydrogen from octahedral-like surface sites into the bulk is thought to push RE 5d states from the hydrogen bonding band back to the conduction band, producing a metallic surface dihydride.