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Structural origins of the infamous "Low Temperature Orthorhombic" to "Low Temperature Tetragonal" phase transition in high-Tc cuprates (2022)
Journal Article
Tidey, J. P., Keegan, C., Bristowe, N. C., Mostofi, A. A., Hong, Z.-M., Chen, B.-H., Chuang, Y.-C., Chen, W.-T., & Senn, M. S. (2022). Structural origins of the infamous "Low Temperature Orthorhombic" to "Low Temperature Tetragonal" phase transition in high-Tc cuprates. Physical Review B, 106(8), Article 085112. https://doi.org/10.1103/physrevb.106.085112

We undertake a detailed high-resolution diffraction study of a plain band insulator, La2MgO4, which may be viewed as a structural surrogate system of the undoped end-member of the high-Tc superconductor family La2−x−yA2+xR3+yCuO 4 (A=Ba,Sr;R=rare ear... Read More about Structural origins of the infamous "Low Temperature Orthorhombic" to "Low Temperature Tetragonal" phase transition in high-Tc cuprates.

Quantum Spin 1/2 Dimers in a Low Dimensional Tetrabromocuprate Magnet (2022)
Journal Article
Sampson, G., Bristowe, N. C., Carr, S. T., Saib, A., Stenning, G. B., Clark, E. R., & Saines, P. J. (2022). Quantum Spin 1/2 Dimers in a Low Dimensional Tetrabromocuprate Magnet. Chemistry - A European Journal, 28(32), Article e202200855. https://doi.org/10.1002/chem.202200855

This work describes a homometallic spin-urn:x-wiley:09476539:media:chem202200855:chem202200855-math-0001 tetrabromocuprate adopting a bilayer structure. Magnetic-susceptibility measurements show a broad maximum centred near 70 K, with fits to this da... Read More about Quantum Spin 1/2 Dimers in a Low Dimensional Tetrabromocuprate Magnet.

Soft-mode anisotropy in the negative thermal expansion material ReO3 (2021)
Journal Article
Bird, T., Wilkinson, M., Keen, D., Smith, R., Bristowe, N., Dove, M., Phillips, A., & Senn, M. (2021). Soft-mode anisotropy in the negative thermal expansion material ReO3. Physical Review B, 104(21), Article 214102. https://doi.org/10.1103/physrevb.104.214102

We use a symmetry-motivated approach to analyse neutron pair distribution function data to investigate the character of the soft phonon modes in negative thermal expansion (NTE) material ReO3. This analysis shows that its local structure is dominated... Read More about Soft-mode anisotropy in the negative thermal expansion material ReO3.

Striping of orbital-order with charge-disorder in optimally doped manganites (2021)
Journal Article
Chen, W.-T., Wang, C.-W., Cheng, C.-C., Chuang, Y.-C., Simonov, A., Bristowe, N. C., & Senn, M. S. (2021). Striping of orbital-order with charge-disorder in optimally doped manganites. Nature Communications, 12(1), Article 6319. https://doi.org/10.1038/s41467-021-26625-w

The phase diagrams of LaMnO3 perovskites have been intensely studied due to the colossal magnetoresistance (CMR) exhibited by compositions around the 3 8 th doping level. However, phase segregation between ferromagnetic (FM) metallic and antiferromag... Read More about Striping of orbital-order with charge-disorder in optimally doped manganites.

Structural and magnetic phase diagram of epitaxial La0.7Sr0.3MnO3 from first principles (2021)
Journal Article
Pilo, J., Pruneda, J., & Bristowe, N. (2021). Structural and magnetic phase diagram of epitaxial La0.7Sr0.3MnO3 from first principles. Electronic Structure, 3(2), Article 024001. https://doi.org/10.1088/2516-1075/abe6af

ABO$_3$ perovskites host a huge range of symmetry lowering structural distortions, each of which can tune, or even switch on or off, different functional properties due to the strong coupling between the lattice and spin and charge degrees of freedom... Read More about Structural and magnetic phase diagram of epitaxial La0.7Sr0.3MnO3 from first principles.

Mechanisms for collective inversion-symmetry breaking in dabconium perovskite ferroelectrics (2021)
Journal Article
Allen, D., Bristowe, N., Goodwin, A., & Yeung, H. .-M. (2021). Mechanisms for collective inversion-symmetry breaking in dabconium perovskite ferroelectrics. Journal of Materials Chemistry C Materials for optical and electronic devices, 2021(8), 2706-2711. https://doi.org/10.1039/d1tc00619c

Dabconium hybrid perovskites include a number of recently-discovered ferroelectric phases with large spontaneous polarisations. The origin of ferroelectric response has been rationalised in general terms in the context of hydrogen bonding, covalency,... Read More about Mechanisms for collective inversion-symmetry breaking in dabconium perovskite ferroelectrics.

From first- to second-order phase transitions in hybrid improper ferroelectrics through entropy stabilization (2020)
Journal Article
Pomiro, F., Ablitt, C., Bristowe, N. C., Mostofi, A. A., Won, C., Cheong, S.-W., & Senn, M. S. (2020). From first- to second-order phase transitions in hybrid improper ferroelectrics through entropy stabilization. Physical Review B, 102(1), Article 014101. https://doi.org/10.1103/physrevb.102.014101

Hybrid improper ferroelectrics (HIFs) have been studied intensively over the past few years to gain an understanding of their temperature-induced phase transitions and ferroelectric switching pathways. Here we report a switching from a first- to a se... Read More about From first- to second-order phase transitions in hybrid improper ferroelectrics through entropy stabilization.