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Structural phase transitions in the geometric ferroelectric LaTa O4
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dc.contributor.author | Howieson, Grant W. | |
dc.contributor.author | Mishra, Karuna K. | |
dc.contributor.author | Gibbs, Alexandra S. | |
dc.contributor.author | Katiyar, Ram S. | |
dc.contributor.author | Scott, James F. | |
dc.contributor.author | Morrison, Finlay D. | |
dc.contributor.author | Carpenter, Michael | |
dc.date.accessioned | 2021-03-11T15:30:07Z | |
dc.date.available | 2021-03-11T15:30:07Z | |
dc.date.issued | 2021-01-29 | |
dc.identifier | 272844850 | |
dc.identifier | 4ef5b6c6-7ce3-496c-9e8c-7190fda6cd25 | |
dc.identifier | 85100318721 | |
dc.identifier | 000613140600002 | |
dc.identifier.citation | Howieson , G W , Mishra , K K , Gibbs , A S , Katiyar , R S , Scott , J F , Morrison , F D & Carpenter , M 2021 , ' Structural phase transitions in the geometric ferroelectric LaTa O 4 ' , Physical Review. B, Condensed matter and materials physics , vol. 103 , no. 1 , 014119 . https://doi.org/10.1103/PhysRevB.103.014119 | en |
dc.identifier.issn | 2469-9950 | |
dc.identifier.other | ORCID: /0000-0002-2813-3142/work/88730808 | |
dc.identifier.other | ORCID: /0000-0002-7012-1831/work/88730979 | |
dc.identifier.uri | https://hdl.handle.net/10023/21617 | |
dc.description | Funding: School of Chemistry, University of St Andrews for funding of a studentship to GWH through the EPSRC doctoral training grant (Grant No. EP/N509759/1). This work was also facilitated by funding provided by the EPSRC (Grant No. EP/P024637/1). K.K.M. and R.S.K. acknowledge financial support from the Department of Defense, USA (DoD Grant No. FA9550-20-1-0064). The RUS component of this work was funded by EPSRC Grant No. EP/P024904/1. | en |
dc.description.abstract | The recent report of an intermediate incommensurately modulated orthorhombic phase in LaTaO4 has prompted a re-examination of the phase transition sequence in LaTaO4 as a function of temperature. With falling temperature, the sequence of phases examined is (orthorhombic) Cmc21(C)↔Cmc21(IC)↔(monoclinic)P21/c, with C and IC denoting commensurate and incommensurate phases, respectively. The orthorhombic to monoclinic transition, Tm-o, is a first order reconstructive transition occurring at 440 K and TIC-C is a first-order displacive transition occurring at 500-530 K. Strain and elasticity data confirm a first-order transition between the basic and modulated Cmc21 phases, with similarities to the isostructural fluoride BaMnF4. A Raman spectroscopic study of the LaTaO4 phase transition indicates that the IC-C phase transition is driven by a soft zone-boundary phonon (unstable) of the commensurate orthorhombic (Cmc21) phase. The soft phonon is found to appear (underdamped) above 443 K and vanishes (overdamped) around 528 K. A large supercell of the monoclinic phase below Tm-o is proposed based on the Raman spectroscopic results. | |
dc.format.extent | 12 | |
dc.format.extent | 4073728 | |
dc.language.iso | eng | |
dc.relation.ispartof | Physical Review. B, Condensed matter and materials physics | en |
dc.subject | QC Physics | en |
dc.subject | QD Chemistry | en |
dc.subject | TK Electrical engineering. Electronics Nuclear engineering | en |
dc.subject | Electronic, Optical and Magnetic Materials | en |
dc.subject | Condensed Matter Physics | en |
dc.subject | NDAS | en |
dc.subject | MCC | en |
dc.subject.lcc | QC | en |
dc.subject.lcc | QD | en |
dc.subject.lcc | TK | en |
dc.title | Structural phase transitions in the geometric ferroelectric LaTa O4 | en |
dc.type | Journal article | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.institution | University of St Andrews. School of Chemistry | en |
dc.contributor.institution | University of St Andrews. Centre for Designer Quantum Materials | en |
dc.contributor.institution | University of St Andrews. EaSTCHEM | en |
dc.identifier.doi | 10.1103/PhysRevB.103.014119 | |
dc.description.status | Peer reviewed | en |
dc.identifier.grantnumber | EP/P024637/1 | en |
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