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Equivalence of the Boson Peak in Glasses to the Transverse Acoustic van Hove Singularity in Crystals (Articolo in rivista)

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Equivalence of the Boson Peak in Glasses to the Transverse Acoustic van Hove Singularity in Crystals (Articolo in rivista) (literal)

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A. I. Chumakov;1,* G. Monaco;1 A. Monaco;1 W. A. Crichton;1,+ A. Bosak;1 R. Ruffer;1 A. Meyer;2,? F. Kargl;2,? L. Comez;3,4 D. Fioretto;5,4 H. Giefers;6 S. Roitsch;6 G. Wortmann;6 M. H. Manghnani;7 A. Hushur;7 Q. Williams;8 J. Balogh;7 K. Parlinski;9 P. Jochym;9 and P. Piekarz9 (2011)
Equivalence of the Boson Peak in Glasses to the Transverse Acoustic van Hove Singularity in Crystals
in Physical review letters
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

A. I. Chumakov;1,* G. Monaco;1 A. Monaco;1 W. A. Crichton;1,+ A. Bosak;1 R. Ruffer;1 A. Meyer;2,? F. Kargl;2,? L. Comez;3,4 D. Fioretto;5,4 H. Giefers;6 S. Roitsch;6 G. Wortmann;6 M. H. Manghnani;7 A. Hushur;7 Q. Williams;8 J. Balogh;7 K. Parlinski;9 P. Jochym;9 and P. Piekarz9 (literal)

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1European Synchrotron Radiation Facility, F-38043, Grenoble, France 2Physics Department E13, Technische Universita¨t Mu¨nchen, D-85747 Garching, Germany 3IOM-CNR, c/o Universita´ di Perugia, I-06123, Perugia, Italy 4Dipartimento di Fisica, Universita´ di Perugia, I-06123 Perugia, Italy 5INFM CRS-SOFT, c/o Universita´ di Roma ''la Sapienza'', I-00185 Roma, Italy 6Department of Physics, University of Paderborn, D-33095 Paderborn, Germany 7School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822, USA 8University of California at Santa Cruz, Department of Earth Sciences, Santa Cruz, California 95064, USA 9Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krako´w, Poland (literal)

Titolo

Equivalence of the Boson Peak in Glasses to the Transverse Acoustic van Hove Singularity in Crystals (literal)

Abstract

We compare the atomic dynamics of the glass to that of the relevant crystal. In the spectra of inelastic scattering, the boson peak of the glass appears higher than the transverse acoustic (TA) singularity of the crystal. However, the density of states shows that they have the same number of states. Increasing pressure causes the transformation of the boson peak of the glass towards the TA singularity of the crystal. Once corrected for the difference in the elastic medium, the boson peak matches the TA singularity in energy and height. This suggests the identical nature of the two features. (literal)

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