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Variable temperature powder neutron diffraction study of SmNiO3 through its M-I transition using a combination of samarium and nickel isotopic substitution

Variable temperature powder neutron diffraction study of SmNiO3 through its M-I transition using a combination of samarium and nickel isotopic substitution
Variable temperature powder neutron diffraction study of SmNiO3 through its M-I transition using a combination of samarium and nickel isotopic substitution
Neutron powder diffraction studies of 154Sm58NiO3, 154Sm60NiO3, and 154Sm62NiO3, at a range of temperatures through the M-I transition at approximately 128° C, have been performed on the new general materials diffractometer (GEM) at ISIS, RAL. With combined data-set Rietveld analysis, using samples containing different nickel isotopes with contrasting scattering lengths, it has been found that extremely high quality structural parameters can be determined, even though total data collection times are more than an order of magnitude shorter than those previously used for this system. Rietveld analysis shows that the evolution of the structural parameters over the temperature range are smooth and that no symmetry change or abrupt structural transition occurs at the M-I transition. This is consistent with evolution of the high-temperature metallic material within the low-temperature insulating phase over the temperature range 108-128° C. The key effects of thermal motion on the M-I transition have been extracted from the data and are discussed.
metal-insulator-transition, r = ho, charge disproportionation, rnio3 perovskites, rare-earth, ndnio3, evolution, ynio3, er, lu
0897-4756
4104-4110
Henry, Paul F.
6ab0d6ca-bb2c-4286-9fad-1a5894dd8b75
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Wilson, Chick C.
4b5044d0-fb05-4d70-92b1-d12387c593a1
Henry, Paul F.
6ab0d6ca-bb2c-4286-9fad-1a5894dd8b75
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Wilson, Chick C.
4b5044d0-fb05-4d70-92b1-d12387c593a1

Henry, Paul F., Weller, Mark T. and Wilson, Chick C. (2002) Variable temperature powder neutron diffraction study of SmNiO3 through its M-I transition using a combination of samarium and nickel isotopic substitution. Chemistry of Materials, 14 (10), 4104-4110. (doi:10.1021/cm021192v).

Record type: Article

Abstract

Neutron powder diffraction studies of 154Sm58NiO3, 154Sm60NiO3, and 154Sm62NiO3, at a range of temperatures through the M-I transition at approximately 128° C, have been performed on the new general materials diffractometer (GEM) at ISIS, RAL. With combined data-set Rietveld analysis, using samples containing different nickel isotopes with contrasting scattering lengths, it has been found that extremely high quality structural parameters can be determined, even though total data collection times are more than an order of magnitude shorter than those previously used for this system. Rietveld analysis shows that the evolution of the structural parameters over the temperature range are smooth and that no symmetry change or abrupt structural transition occurs at the M-I transition. This is consistent with evolution of the high-temperature metallic material within the low-temperature insulating phase over the temperature range 108-128° C. The key effects of thermal motion on the M-I transition have been extracted from the data and are discussed.

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More information

Published date: 1 October 2002
Keywords: metal-insulator-transition, r = ho, charge disproportionation, rnio3 perovskites, rare-earth, ndnio3, evolution, ynio3, er, lu

Identifiers

Local EPrints ID: 19770
URI: http://eprints.soton.ac.uk/id/eprint/19770
ISSN: 0897-4756
PURE UUID: d1b348da-67b4-484a-96c3-65732c7aef87

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Date deposited: 20 Feb 2006
Last modified: 08 Jan 2022 09:51

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Contributors

Author: Paul F. Henry
Author: Mark T. Weller
Author: Chick C. Wilson

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