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A study of low energy magnetic excitations in terbium metaphosphate glass

A study of low energy magnetic excitations in terbium metaphosphate glass
A study of low energy magnetic excitations in terbium metaphosphate glass
The existence of a wide distribution of low energy excess magnetic states due to topological disorder in a magnetic glass is confirmed experimentally for the case of terbium metaphosphate glasses with compositions in the vicinity of (Tb2O3)0.25(P2O5)0.75. A broad peak with a maximum at 7.5 K is found in the magnetic contribution to the specific heat; this has its origin in the excess magnetic states. There is also a residual magnetic contribution from these states to the inelastic neutron scattering, which has been isolated by subtraction of the phonon contribution. Exploiting the paramagnetic behaviour, a novel method of neutron scattering has been investigated, which can be used to isolate the Tb–Tb correlation distances in terbium metaphosphate glass. This method uses the fact that neutrons are sensitive to changes in scattering lengths, and the scattering length of a paramagnetic rare earth ion, in a metaphosphate glass host, can be changed by applying a magnetic field.
0022-3093
60-72
Brennan, T.
8b042c31-b3b8-4afb-b7c1-8ffc89e02245
Saunders, G.A.
86c9d9ba-c71b-4b31-942f-5ce398b03796
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Eccleston, R.S.
1986e57a-28af-4bf7-b3da-7ae08271e31d
Smith, R.I.
8608e7ed-3338-4e61-b0ad-fbbd2f7921c7
Carini, G.
4c28a691-2c0d-4ae0-8221-61092b330e17
D'Angelo, G.
1f0986c4-5737-478b-8ce6-fe2a980af4dd
Tripodo, G.
8b34ead8-f850-415a-b259-2d80dfe56d1e
Brennan, T.
8b042c31-b3b8-4afb-b7c1-8ffc89e02245
Saunders, G.A.
86c9d9ba-c71b-4b31-942f-5ce398b03796
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Eccleston, R.S.
1986e57a-28af-4bf7-b3da-7ae08271e31d
Smith, R.I.
8608e7ed-3338-4e61-b0ad-fbbd2f7921c7
Carini, G.
4c28a691-2c0d-4ae0-8221-61092b330e17
D'Angelo, G.
1f0986c4-5737-478b-8ce6-fe2a980af4dd
Tripodo, G.
8b34ead8-f850-415a-b259-2d80dfe56d1e

Brennan, T., Saunders, G.A., Rainford, B.D., Eccleston, R.S., Smith, R.I., Carini, G., D'Angelo, G. and Tripodo, G. (2003) A study of low energy magnetic excitations in terbium metaphosphate glass. Journal of Non-Crystalline Solids, 332 (1-3), 60-72. (doi:10.1016/j.jnoncrysol.2003.08.083).

Record type: Article

Abstract

The existence of a wide distribution of low energy excess magnetic states due to topological disorder in a magnetic glass is confirmed experimentally for the case of terbium metaphosphate glasses with compositions in the vicinity of (Tb2O3)0.25(P2O5)0.75. A broad peak with a maximum at 7.5 K is found in the magnetic contribution to the specific heat; this has its origin in the excess magnetic states. There is also a residual magnetic contribution from these states to the inelastic neutron scattering, which has been isolated by subtraction of the phonon contribution. Exploiting the paramagnetic behaviour, a novel method of neutron scattering has been investigated, which can be used to isolate the Tb–Tb correlation distances in terbium metaphosphate glass. This method uses the fact that neutrons are sensitive to changes in scattering lengths, and the scattering length of a paramagnetic rare earth ion, in a metaphosphate glass host, can be changed by applying a magnetic field.

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Published date: 15 December 2003

Identifiers

Local EPrints ID: 57123
URI: https://eprints.soton.ac.uk/id/eprint/57123
ISSN: 0022-3093
PURE UUID: 5379e47f-349f-4c75-9633-7a1b603b5360

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Date deposited: 13 Aug 2008
Last modified: 13 Mar 2019 20:34

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