The valence of cerium in CeCu2Si2 under high pressure

Röhler, J.; Klug, Johannes; Keulerz, K.

doi:10.1016/0304-8853(88)90416-7

Cited by 23 publications

(13 citation statements)

References 9 publications

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“…In CeCu 2 Ge 2 x-ray diffraction suggests a valence transition at a pressure p c2 ≈ 15 GPa (Onodera et al, 2002). However, there is no microscopic evidence for a valence transition in CeCu 2 Si 2−x Ge x except for faint features seen in the L III -x-ray absorption (Roehler et al, 1988) and changes of the metallic state notably the electrical resistivity.…”

Section: Border Of Valence Transitionsmentioning

confidence: 92%

Superconducting phases off-electron compounds

2009

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Intermetallic compounds containing f-electron elements display a wealth of superconducting phases, that are prime candidates for unconventional pairing with complex order parameter symmetries. For instance, superconductivity has been found at the border of magnetic order as well as deep within ferro-and antiferromagnetically ordered states, suggesting that magnetism may promote rather than destroy superconductivity. Superconductivity near valence transitions, or in the vicinity of magneto-polar order are candidates for new superconductive pairing interactions such as fluctuations of the conduction electron density or the crystal electric field, respectively. The experimental status of the study of the superconducting phases of f-electron compounds is reviewed.

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Section: Border Of Valence Transitionsmentioning

confidence: 92%

Superconducting phases off-electron compounds

2009

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“…The first direct indications for a valence transition in CeCu 2 Si 2 under pressure come from L III x-ray absorption spectroscopy. 84,85 In elemental cerium, the critical endpoint occurs at very high temperatures. In contrast, in the series CeCu 2 (Si 1−x Ge x ) 2 (x = 0.01, 0.05, 0.1) and CeCu 2 Si 2 the critical endpoint is shifted down to 10−20 K, opening the way for sufficiently large density-density fluctuations to drive superconductivity.…”

Section: Valence Instabilitymentioning

confidence: 99%

Superconductivity in Ce- and U-Based “122” Heavy-Fermion Compounds

et al. 2012

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“…Although, XAS is closely related to IXS and will be discussed later, it is worth mentioning the pioneering work of and Röhler et al (1988) on the valence change of rare earth systems under pressure.…”

Section: B Historical Contextmentioning

confidence: 99%

Inelastic x-ray scattering by electronic excitations under high pressure

Rueff¹,

Shukla²

2010

Rev. Mod. Phys.

177

140

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Investigating electronic structure and excitations under extreme conditions gives access to a rich variety of phenomena. High pressure typically induces behavior such as magnetic collapse and the insulator-metal transition in 3d transition metals compounds, valence fluctuations or Kondo-like characteristics in f -electron systems, and coordination and bonding changes in molecular solids and glasses. This article reviews research concerning electronic excitations in materials under extreme conditions using inelastic x-ray scattering (IXS). IXS is a spectroscopic probe of choice for this study because of its chemical and orbital selectivity and the richness of information it provides. Being an all-photon technique, IXS has a penetration depth compatible with high pressure requirements. Electronic transitions under pressure in 3d transition metals compounds and f -electron systems, most of them strongly correlated, are reviewed. Implications for geophysics are mentioned. Since the incident X-ray energy can easily be tuned to absorption edges, resonant IXS, often employed, is discussed at length. Finally studies involving local structure changes and electronic transitions under pressure in materials containing light elements are briefly reviewed.

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The valence of cerium in CeCu2Si2 under high pressure

Cited by 23 publications

References 9 publications

Superconducting phases off-electron compounds

Superconducting phases off-electron compounds

Superconductivity in Ce- and U-Based “122” Heavy-Fermion Compounds

Inelastic x-ray scattering by electronic excitations under high pressure

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