Phonon density-of-states in bcc and hcp Eu metal under high pressure measured by ¹⁵¹Eu nuclear inelastic scattering of synchrotron radiation

References

• Takemura , K. and Syassen , K. 1985 . Pressure-volume relations and polymorphism of europium and ytterbium to 30 GPa . J. Phys. F; Met. Phys. , 15 : 543 – 558 .
   Google Scholar
• Farrell , J. N. and Taylor , R. D. 1987 . Coexistence of intermediate valence and antiferromagnetic ordering in europium metal . Phys. Rev. Lett. , 58 : 2478 – 2481 .
   PubMedGoogle Scholar
• Röhler , J. 1986 . The valence of Eu under high pressure . Physica , 144B : 27 – 31 .
   Google Scholar
• Heathman , S. , Haire , R. G. , Le Bihan , T. , Lindbaum , A. , Idiri , M. , Normile , P. , Li , S. , Ahuja , R. , Johansson , B. and Lander , G. H. 2005 . A high-pressure structure in curium linked to magnetism . Science , 309 : 110 – 113 .
   PubMed Web of Science ®Google Scholar
• Dai , X. , Savrasov , S. Y. , Kotliar , G. , Migliori , A. , Ledbetter , H. and Abrahams , E. 2003 . Calculated phonon spectra of plutonium at high temperatures . Science , 300 : 953 – 955 .
   PubMed Web of Science ®Google Scholar
• Wong , L. , Krisch , M. , Farber , D. L. , Occelli , F. , Schwartz , A. J. , Chiang , T.-C. , Wall , M. , Boro , C. and Xu , R. 2003 . Phonon dispersions of fcc δ-plutonium-gallium by inelastic X-ray scattering . Science , 301 : 1078 – 1080 .
   PubMed Web of Science ®Google Scholar
• Stankov , S. , Piekarz , P. , Olés , A. M. , Parlinski , K. and Rüffer , R. 2008 . Lattice dynamics of Eu from nuclear inelastic scattering and first-principles calculations . Phys. Rev. B , 78 in press
   Google Scholar
• Barla , A. , Rüffer , R. , Chumakov , A. I. , Metge , J. , Plessel , J. and Abd-Elmeguid , M. M. 2000 . Direct determination of the phonon density of states in β-Sn . Phys. Rev. B , 61 : R14881 – R14484 .
   Google Scholar
• Giefers , H. , Tanis , E. A. , Rudin , S. P. , Greeff , C. , Ke , X. , Chen , C. , Nicol , M. F. , Pravica , M. , Pravica , W. , Zhao , J. , Alatas , A. , Lerche , M. , Sturhahn , W. and Alp , E. 2007 . Phonon density of states of metallic Sn at high pressure . Phys. Rev. Lett. , 98 : 245502-1-4
   Google Scholar
• Rüffer , R. and Chumakov , A. I. 1996 . Nuclear resonance beamline at ESRF . Hyperfine Interact. , 97/98 : 589 – 604 .
   Google Scholar
• Long , G. J. , Hermann , R. P. , Grandjean , F. , Alp , E. E. , Sturhahn , W. , Johnson , Ch. E. , Brown , D. E. , Leupold , O. and Rüffer , R. 2005 . Strongly decoupled europium and iron vibrational modes in filled skutterudites . Phys. Rev. B , 71 : 140302(R) – l40305(R) .
   Google Scholar
• Hermann , R. P. , Schweika , W. , Leupold , O. , Rüffer , R. , Nolas , G. S. , Grandjean , F. and Long , G. J. 2005 . Neutron and nuclear ineleastic scattering study of the Einstein oscillators in Ba-, Sr-, and Eu-filled germanium clathrates . Phys. Rev. B , 72 : 174301 – 174306 .
   Google Scholar
• Lübbers , R. , Grünsteudel , H. F. , Chumakov , A. I. and Wortmann , G. 2000 . Density of phonon states in iron at high pressure . Science , 287 : 1250 – 1253 .
   PubMed Web of Science ®Google Scholar
• Giefers , H. , Lübbers , R. , Rupprecht , K. , Wortmann , G. , Alfè , D. and Chumakov , A. I. 2002 . Phonon spectroscopy of oriented hcp iron . High Press. Res. , 22 : 501 – 506; . H. Giefers, G. Wortmann, A.I. Chumakov, and D. Alfé, High-pressure phonon spectroscopy of oriented hcp iron, ESRF Highlights 2004, ed. G. Admans (ESRF, Grenoble, 2005), pp. 19–20
   Web of Science ®Google Scholar
• Syassen , K. 2008 . Ruby under pressure . High Press. Res. , 28 : 75 – 126 .
   Web of Science ®Google Scholar
• Leupold , O. , Rupprecht , K. and Wortmann , G. 2003 . Electronic and magnetic transitions in europium compounds studied by nuclear forward scattering of synchrotron radiation . Struct. Chem. , 14 : 97 – 107 .
   Google Scholar
• Pleines , M. , Lübbers , R. , Strecker , M. , Wortmann , G. , Leupold , O. , Metge , J. , Shvyd'ko , Yu. V. and Gerdau , E. 1999 . Pressure-induced valence transition in EuNi2Ge2 studied by Eu-151 nuclear forward scattering of synchrotron radiation . Hyperfine Interact. , 120/121 : 181 – 185 .
   Google Scholar
• Röhler , J. , Wohlleben , D. , Kaindl , G. and Balster , H. 1982 . Energy balance in mixed-valent Eu ions . Phys. Rev. Lett. , 49 : 65 – 68 .
   Google Scholar
• Wortmann , G. 1989 . Edge spectroscopy . Hyperfine Interact. , 47 : 179 – 202 .
   Google Scholar
• Chumakov , A. I. , Rüffer , R. , Baron , A. Q.R. , Grünsteudel , H. and Grünsteudel , H. F. 1996 . Temperature dependence of nuclear inelastic absorption of synchrotron radiation in α-57 Fe . Phys. Rev. B , 54 : R9596 – R9599 . V.G. Kohn and A.I. Chumakov, DOS: Evaluation of phonon density of states from nuclear resonant inelastic absorption, Hyperfine Interact. 125 (2000), pp. 205–221
   Google Scholar
• Gerstein , B. C. , Jelinek , F. J. , Mullaly , J. R. , Shickell , W. D. and Spedding , F. H. 1967 . Heat Capacity of europium from 5° to 300 °K . J. Chem. Phys. , 47 : 5194 – 5201; . J. Kalus, Influence of the lattice potential on the line shape of γ-rays emitted by Sm nuclei recoiling with 3 eV in Eu metal and EuO, Phys. Rev. B 1 (1979), pp. 3569–3576
   Web of Science ®Google Scholar
• H.R. Schober and P.H. Dederichs, in: Landolt-Börnstein, New Series, Vol. III/13a (Springer, Berlin 1981), pp. 64–66, and 144–147; J.C. Glyden Houmann and R.M. Nicklow, Lattice dynamics of terbium Phys. Rev. B 1 (1970), 3943–3952 R.M. Nicklow, N. Wakabayashi, and P.R. Vijayaraghavan, Lattice dynamics of holmium, Phys. Rev. B 3 (1971), pp. 1229–1234.
   Google Scholar
• Chumakov , A. I. , Riiffer , R. , Leupold , O. , Barla , A. , Thiess , H. , Gil , J. M. , Alberto , H. V. , Vilao , R. C. , Ayes de Campos , N. , Kohn , V. G. , Gerken , M. and Lucht , M. 2001 . Nuclear inelastic scattering with 161Dy . Phys. Rev. B , 63 : 172301-1-4
   Google Scholar
• Grosshans , W. A. and Holzapfel , W. B. 1992 . Atomic volumes of rare-earth metals under pressures to 40 GPa and above . Phys. Rev. B , 45 : 5171 – 5178 .
   PubMed Web of Science ®Google Scholar
• Raymond , S. , Rueff , J. P. , D'Astuto , M. , Braithwaite , D. , Krisch , M. and Flouquet , J. 2002 . Phonon anomalies at the valence transition of SmS: An inelastic x-ray-scattering study under pressure . Phys. Rev. B , 66 : R220301-1-4
   Google Scholar
• Ponkratz , U. , Barla , A. , Sanchez , J. P. , Rüffer , R. and Wortmann , G. 2008 . Phonon density of states of SmS under high pressure determined by 149Sm nuclear inelastic scattering . Phys. Rev. B , 78 : 104120-1-8
   Google Scholar
• Rosengren , A. and Johansson , B. 1976 . Alloy theory of the intermediate valence state: Application to europium metal . Phys. Rev. B , 13 : 1468 – 1472 .
   Google Scholar