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Cation displacements and the structures of the superconducting pyrochlore osmates AOs(2)O(6) (A = K, Rb, and Cs)

Cation displacements and the structures of the superconducting pyrochlore osmates AOs(2)O(6) (A = K, Rb, and Cs)
Cation displacements and the structures of the superconducting pyrochlore osmates AOs(2)O(6) (A = K, Rb, and Cs)
Variable temperature, 2 K<T<500 K, powder neutron diffraction studies of the beta-pyrochlores AOs2O6 and ANbTeO6, A=K, Rb, and Cs, have been undertaken. Anomalous behaviors in the lattice parameter variations as a function of temperature for the superconducting osmates with A=K, and to a lesser extent for A=Rb, are associated with local, static displacements of the alkali metal cation, which occur below ~80 K. These displacements are random around the 8b position as modeled in the space group Fd-3m; no evidence for decrease in symmetry from Fd-3m was observed for any sample above 2 K. For the nonsuperconducting ANbTeO6, A=K, Rb, and Cs, phases, similar structural and lattice parameter behaviors are observed with localization of the potassium ions in KNbTeO6 below ~30 K.
1550-235X
Galati, R.
ccdb5ce5-6771-46c2-ae68-8323413d7623
Simon, C.
02904d47-a311-44a0-9f95-362e92b3eb83
Henry, P.F.
7a749ff8-32f2-4075-9d7f-1852a62cf88e
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Galati, R.
ccdb5ce5-6771-46c2-ae68-8323413d7623
Simon, C.
02904d47-a311-44a0-9f95-362e92b3eb83
Henry, P.F.
7a749ff8-32f2-4075-9d7f-1852a62cf88e
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4

Galati, R., Simon, C., Henry, P.F. and Weller, M.T. (2008) Cation displacements and the structures of the superconducting pyrochlore osmates AOs(2)O(6) (A = K, Rb, and Cs). Physical Review B, 77 (10). (doi:10.1103/PhysRevB.77.104523).

Record type: Article

Abstract

Variable temperature, 2 K<T<500 K, powder neutron diffraction studies of the beta-pyrochlores AOs2O6 and ANbTeO6, A=K, Rb, and Cs, have been undertaken. Anomalous behaviors in the lattice parameter variations as a function of temperature for the superconducting osmates with A=K, and to a lesser extent for A=Rb, are associated with local, static displacements of the alkali metal cation, which occur below ~80 K. These displacements are random around the 8b position as modeled in the space group Fd-3m; no evidence for decrease in symmetry from Fd-3m was observed for any sample above 2 K. For the nonsuperconducting ANbTeO6, A=K, Rb, and Cs, phases, similar structural and lattice parameter behaviors are observed with localization of the potassium ions in KNbTeO6 below ~30 K.

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Published date: 2008

Identifiers

Local EPrints ID: 54453
URI: http://eprints.soton.ac.uk/id/eprint/54453
ISSN: 1550-235X
PURE UUID: 2b647a17-9c0b-41e7-91bc-559cb6b1fb44

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Date deposited: 05 Aug 2008
Last modified: 13 Mar 2019 20:38

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