Pressure-induced valence change in YbAl3: a combined high pressure inelastic x-ray scattering and theoretical investigation

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Physical Review. B, Condensed Matter and Materials Physics

OSTI ID:964963

Bauer, E D ^[1]; Kumar, R S ^[2]; Svane, A ^[3]; Vaitheeswaran, G ^[4]; Nicol, M F ^[2]; Kanchana, V ^[5]; Hu, M ^[6]; Cornelius, A L ^[2]

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1. Los Alamos National Laboratory
2. UNIV OF NV
3. UNIV OF AARHUS
4. ROYAL INST. OF TECHNOLOGY
5. ROYAL INST OF TECHNOLOGY
6. HPCAT

High resolution x-ray absorption (XAS) experiments in the partial fluorescence yield mode (PFY) and resonant inelastic x-ray emission (RXES) measurements under pressure were performed on the intermediate valence compound YbAl{sub 3} up to 38 GPa. The results of the Yb L{sub 3} PFY-XAS and RXES studies show a smooth valence increase in YbAl{sub 3} from 2.75 to 2.93 at ambient to 38 GPa. In-situ angle dispersive synchrotron high pressure x-ray diffraction experiments carried out using a diamond cell at room temperature to study the equation of state showed the ambient cubic phase stable up to 40 GPa. The results obtained from self-interaction corrected local spin density functional calculations to understand the pressure effect on the Yb valence and compressibility are in good agreement with the experimental results.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 964963
• Report Number(s): LA-UR-08-05220; LA-UR-08-5220
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
COMPRESSIBILITY
DIAMONDS
FLUORESCENCE
FUNCTIONALS
PRESSURE DEPENDENCE
RESOLUTION
SCATTERING
SPIN
SYNCHROTRONS
VALENCE
X-RAY DIFFRACTION