217 citations · 619 across the 29 of their papers we have counts for
30 papers
Hidden Magnetic Octupolar Order driven by Spin-Orbit coupling in KFeF
C. A. Crawford, C. I. Hiley, N. C. Bristowe +6
Phase transitions are typically driven by symmetry-breaking structural distortions that lift electronic degeneracies, yet in some cases, these transitions may be driven by a hidden…
Resolving competing distortions in Ca0.4Sr0.6TiO3 using complementary electron and X-ray techniques
Robin Sjökvist, Catriona A. Crawford, Richard Beanland +1
We present a study of the perovskite Ca0.4Sr0.6TiO3 using variable temperature transmission electron microscopy (TEM) and powder X-ray diffraction (PXRD). At room temperature and b…
Near-room-temperature magnetoelectric coupling engineered through inversion-breaking tilts in a bulk perovskite polytype
Struan Simpson, Urmimala Dey, Martin R. Lees +3
Systematic strategies to design properties such as ferroelectricity or magnetoelectric coupling are well established in simple perovskite materials, but they remain scarce in more…
The magnetic structure of polar -type charge and orbital ordered Hg-quadruple manganite perovskites
Ben R. M. Tragheim, Fabio Orlandi, En-Pei Liu +2
The magnetic structure of the novel HgNaMnMnO, a quadruple manganite perovskite that exhibits a unique -type charge and orbital ordered state dist…
The Microscopic Structure of Stacking Faults in SrNaNbO
Robin Sjökvist, Yining Xie, Zabeada Aslam +4
Stacking faults and other topological defects in ferroics can have a significant influence on the electronic and mechanical properties of the material. Here, regular stacking fault…
The interplay between Jahn-Teller distortions and structural degrees of freedom on pseudocubic states in manganite perovskites
Ben R. M. Tragheim, Elodie A. Harbourne, Clemens Ritter +2
The average structure of the solid solution LaMnGaO (LMGO) has been investigated from a symmetry-motivated approach utilizing synchrotron x-ray and neutron powder d…
Signatures of Orbital Order and Disorder in Fluoro-Perovskites with Electronic Degeneracies
C. A. Crawford, C. I. Hiley, J. Gainza +3
A detailed high-resolution, variable temperature powder diffraction study of the fluoro-perovskites NaFeF and NaCoF is performed to probe their orbital ordering transitions…
Pressure-induced orbital reordering in NaCuF
Craig I. Hiley, Catriona A. Crawford, Craig L. Bull +5
The high-pressure behaviour of NaCuF is explored by powder neutron diffraction and density functional theory (DFT) calculations. A first-order phase transition is observed…
Goldstone-mediated polar instability in hexagonal barium titanate
S. Simpson, U. Dey, R. J. Sjökvist +5
We discover a rare structural manifestation of the Goldstone paradigm in a hexagonal polytype of the archetypal ferroelectric BaTiO3. First-principles calculations confirm the Gold…
Intrinsic electronic phase separation and competition between -type, -type and -type charge and orbital ordering modes in HgNaMnMnO
Ben R. M. Tragheim, Struan Simpson, En-Pei Liu +2
The novel series of hole-doped quadruple manganite perovskites HgNaMnMnO (HNMO) has been synthesized and its charge and orbital order behavior investigat…
Proximity to an orbital order with charge disorder state in optimally-doped \textit{RE}\textsubscript{5/8}Ca\textsubscript{3/8}MnO\textsubscript{3} perovskites
Ben R. M. Tragheim, Clemens Ritter, Mark S. Senn
The evolution of charge and orbital ordering phenomena in optimally-doped \textit{RE}\textsubscript{5/8}Ca\textsubscript{3/8}MnO\textsubscript{3} (RECMO, \textit{RE} rare-earth…
First-principles investigation of the magnetoelectric properties of BaMnO
Urmimala Dey, Mark S. Senn, Nicholas C. Bristowe
Type-II multiferroics, in which the magnetic order breaks inversion symmetry, are appealing for both fundamental and applied research due their intrinsic coupling between magnetic…
The origin of strain-induced stabilisation of superconductivity in the lanthanum cuprates
Christopher Keegan, Mark S. Senn, Nicholas C. Bristowe +1
Suppression of superconductivity in favour of a striped phase, and its coincidence with a structural transition from a low-temperature orthorhombic (LTO) to a low-temperature tetra…
Pressure-Dependent Phase Transitions in Hybrid Improper Ferroelectric Ruddlesden-Popper Oxides
Gabriel Clarke, Dominik Daisenberger, X. Luo +3
The temperature-dependent phase transitions in Ruddlesden-Popper oxides with perovskite bilayers have been under increased scrutiny in recent years due to the so-called hybrid impr…
Recovery of harmonic-like behaviour of the polar mode in BaTiO at high pressure
A. Herlihy, T. A. Bird, C. J. Ridley +3
The local structure of high pressure BaTiO has been interrogated by neutron total scattering methods, up to pressures of 4.18 GPa at ambient temperature. Competitive refinement…
Structural origins of the infamous "Low Temperature Orthorhombic" to "Low Temperature Tetragonal" phase transition in high-Tc cuprates
Jeremiah P. Tidey, Christopher Keegan, Nicholas C. Bristowe +6
We undertake a detailed high-resolution diffraction study of a novel plain band insulator, LaMgO, which may be viewed as a structural surrogate system of the undoped end-me…
Large dynamic scissoring mode displacements coupled to band gap opening in Hybrid Perovskites
Tobias A. Bird, Jungshen Chen, Manila Songvilay +4
Hybrid perovskites are a rapidly growing research area, having reached photovoltaic power conversion efficiencies of over 25 \%. We apply a symmetry-motivated analysis method to an…
Soft mode anisotropy in negative thermal expansion material ReO
Tobias A. Bird, Mark G. L. Wilkinson, David A. Keen +5
We use a symmetry-motivated approach to analyse neutron pair distribution function data to investigate the mechanism of negative thermal expansion (NTE) in ReO. This analysis s…
Striping of orbital-order with charge-disorder in optimally doped manganites
Wei-Tin Chen, Chin-Wei Wang, Ching-Chia Cheng +4
The phase diagrams of LaMnO perovskites have been intensely studied due to the colossal magnetoresistance (CMR) exhibited by compositions around the doping l…
From first- to second-order phase transitions in hybrid improper ferroelectrics through entropy stabilisation
Fernando Pomiro, Chris Ablitt, Nicholas C. Bristowe +4
Hybrid improper ferroelectrics (HIFs) have been intensely studied over the last few years to gain understanding of their temperature induced phase transitions and ferroelectric swi…
Anharmonicity and scissoring modes in the negative thermal expansion materials ScF and CaZrF
Tobias Bird, Jessica Woodland-Scott, Lei Hu +4
We use a symmetry-motivated approach to analysing X-ray pair distribution functions to study the mechanism of negative thermal expansion in two ReO-like compounds; ScF and…
A Corkscrew Model for Highly Coupled Anisotropic Compliance in Ruddlesden-Popper Oxides with Frozen Octahedral Rotations
Chris Ablitt, Mark S. Senn, Nicholas C. Bristowe +1
A "corkscrew" mechanism, that couples changes in the in-plane rotation angle to strains along the layering axis, has been proposed previously to explain increased compliance in cer…
A Group-theoretical Approach to Enumerating Magnetoelectric and Multiferroic Couplings in Perovskites
Mark S. Senn, Nicholas C. Bristowe
We use a group theoretical approach to enumerate the possible couplings between magnetism and ferroelectric polarisation in the parent perovskite structure. We show th…
Improper Ferroelectric Polarisation in a Perovskite driven by Inter-site Charge Transfer and Ordering
Wei-Tin Chen, Chin-Wei Wang, Hung-Cheng Wu +4
It is of great interest to design and make materials in which ferroelectric polarisation is coupled to other order parameters such as lattice, magnetic and electronic instabilities…