SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000000944

Beamline

BL25SU (Soft X-ray Spectroscopy of Solid)

Scientific keywords

A. Sample category	inorganic material
B. Sample category (detail)	metal, alloy, solid-state crystal, crystal
C. Technique	photoemission, photoionization
D. Technique (detail)	photoelectron spectra
E. Particular condition	ultra-high vacuum, low-T (~ liquid He)
F. Photon energy	soft X-ray
G. Target information	electronic state

Industrial keywords

level 1---Application area	industrial material
level 2---Target
level 3---Target (detail)
level 4---Obtainable information	electronic state
level 5---Technique	XPS

Classification

M40.40 soft x-ray spectroscopy, M50.10 photoelectron spectroscopy

Body text

Resonant photoemission spectroscopy is a powerful tool to investigate electronic states of solids. Partial density of states can be extracted from valence electronic states by using the resonant condition. High energy resolution makes it possible to observe detailed electronic structures in the vicinity of the Fermi level. The figure shows the Ce 4f photoelectron spectra measured for CeRu₂Si₂ and CeRu₂ tuning the excitation energy at the Ce 4f absorption edge. It is revealed that the spectral shapes are quite different between the samples with different Kondo temperatures.

[ A. Sekiyama, T. Iwasaki, K. Matsuda, Y. Saitoh, Y. Oniki and S. Suga, Nature 403, 396-398 (2000), Fig. 3,
©2000 Nature Publishing Group ]

Source of the figure

Original paper/Journal article

Journal title

Nature vol.403 p396(2000)

Figure No.

Fig.3

Technique

Photoemission intensity is resonantly enhanced when the excitation energy is tuned at an absorption edge of an element in a sample. 2p edges of transition metal and 3d edges of rare earth elements are typical in the energy range of BL25SU. Measurements are carried out in a UHV condition. Samples should have electric conductivity to avoid charging. Clean surfaces of the samples are obtained by cleaving or fracture in the UHV chamber.

Source of the figure

No figure

Required time for experimental setup

2 hour(s)

Instruments

Instrument	Purpose	Performance
Photoemission Spectrometer (PES)	resonant photoemission spectroscopy	high resolution

References

Document name
Nature 403, 396 (2000)

Related experimental techniques

Questionnaire

The measurement was possible only in SPring-8. Impossible or very difficult in other facilities.
This solution is an application of a main instrument of the beamline.
Similar experiments account for more than 30% of the beamline's subject.

Ease of measurement

Middle

Ease of analysis

Middle

How many shifts were needed for taking whole data in the figure?

Four-nine shifts