Floppy modes in crystalline and amorphous silicates

M T  Dove; Mark Harris; A C  Hannon; J M Parker; I P Swainson; M Gambhir

doi:10.1103/PhysRevLett.78.1070

Floppy modes in crystalline and amorphous silicates

M T Dove, Mark Harris, A C Hannon, J M Parker, I P Swainson, M Gambhir

School of Divinity

Research output: Contribution to journal › Article › peer-review

Abstract

We present the results of comparative inelastic neutron scattering measurements of both amorphous and crystalline silicates. We demonstrate the presence of floppy modes in amorphous silica and potassium disilicate over the energy scale 0–5 meV. A peak is also observed at 5 meV in amorphous silica, which is traditionally associated with the boson peak. By comparison with the spectrum of crystalline a-cristobalite, we show that it, in fact, arises from the transverse acoustic modes. The same peak in amorphous potassium disilicate cannot be resolved because it is obscured by a large number of floppy modes. [S0031-9007(96)02212-0]

Original language	English
Pages (from-to)	1070-1073
Number of pages	4
Journal	Physical Review Letters
Volume	78
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.78.1070
Publication status	Published - 10 Feb 1997

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10.1103/PhysRevLett.78.1070

Floppy Modes in Crystalline and Amorphous Silicates
©Dove, M. T., Harris, M., Hannon, A. C., Parker, J. M., Swainson, I. P., & Gambhir, M. (1997). Floppy modes in crystalline and amorphous silicates. Physical Review Letters, 78, 1070-1073doi: 10.1103/PhysRevLett.78.1070
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http://dx.doi.org/10.1103/PhysRevLett.78.1070

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abstract = "We present the results of comparative inelastic neutron scattering measurements of both amorphous and crystalline silicates. We demonstrate the presence of floppy modes in amorphous silica and potassium disilicate over the energy scale 0–5 meV. A peak is also observed at 5 meV in amorphous silica, which is traditionally associated with the boson peak. By comparison with the spectrum of crystalline a-cristobalite, we show that it, in fact, arises from the transverse acoustic modes. The same peak in amorphous potassium disilicate cannot be resolved because it is obscured by a large number of floppy modes. [S0031-9007(96)02212-0]",

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T1 - Floppy modes in crystalline and amorphous silicates

AU - Dove, M T

AU - Harris, Mark

AU - Hannon, A C

AU - Parker, J M

AU - Swainson, I P

AU - Gambhir, M

PY - 1997/2/10

Y1 - 1997/2/10

N2 - We present the results of comparative inelastic neutron scattering measurements of both amorphous and crystalline silicates. We demonstrate the presence of floppy modes in amorphous silica and potassium disilicate over the energy scale 0–5 meV. A peak is also observed at 5 meV in amorphous silica, which is traditionally associated with the boson peak. By comparison with the spectrum of crystalline a-cristobalite, we show that it, in fact, arises from the transverse acoustic modes. The same peak in amorphous potassium disilicate cannot be resolved because it is obscured by a large number of floppy modes. [S0031-9007(96)02212-0]

AB - We present the results of comparative inelastic neutron scattering measurements of both amorphous and crystalline silicates. We demonstrate the presence of floppy modes in amorphous silica and potassium disilicate over the energy scale 0–5 meV. A peak is also observed at 5 meV in amorphous silica, which is traditionally associated with the boson peak. By comparison with the spectrum of crystalline a-cristobalite, we show that it, in fact, arises from the transverse acoustic modes. The same peak in amorphous potassium disilicate cannot be resolved because it is obscured by a large number of floppy modes. [S0031-9007(96)02212-0]

U2 - 10.1103/PhysRevLett.78.1070

DO - 10.1103/PhysRevLett.78.1070

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EP - 1073

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 6

ER -

Floppy modes in crystalline and amorphous silicates

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