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Blog

To Superspace and Beyond

By Group | Publications | Comments are Closed | 4 January, 2017 | 0

Mark S. Senn, Acta Cryst. (2017). A73,  1-3. The significance of an algorithm developed by H. T. Stokes & B. J. Campbell [Acta Cryst. (2017), A73, 4-13] is discussed. The algorithm promises to be a key tool for understanding the structure-property relationships of the many technologically important materials that display incommensurate modulations in their atomicRead more

Magnetostriction-driven ground-state stabilization in 2H perovskites

By Mark | Publications | Comments are Closed | 15 November, 2016 | 0

D. G. Porter, M. S. Senn, D. D. Khalyavin, A. Cortese, N. Waterfield-Price, P. G. Radaelli, P. Manuel, H.-C. zur-Loye, C. Mazzoli, and A. Bombardi The magnetic ground state of Sr3ARuO6 , with A=(Li,Na) , is studied using neutron diffraction, resonant x-ray scattering, and laboratory characterization measurements of high-quality crystals. Combining these results allows usRead more

Directed Lifting of Inversion Symmetry in Ruddlesden–Popper Oxide–Fluorides: Toward Ferroelectric and Multiferroic Behavior

By Mark | News, Publications | Comments are Closed | 15 November, 2016 | 0

Ronghuan Zhang, Mark S. Senn, and Michael A. Hayward, Chem. Mater., DOI: 10.1021/acs.chemmater.6b03931   The cooperative tilting distortions of n = 2 Ruddlesden–Popper oxides can be utilized to break the inversion symmetry of the host lattice and induce ferroelectric behavior. Unfortunately the desired a–a–c+/a–a–c+ structural deformation is only stabilized in phases with extremely small structuralRead more

Emergence of long-range order in BaTiO3 from local symmetry-breaking distortions

By Mark | News, Publications | Comments are Closed | 20 May, 2016 | 0

M. S. Senn, D. A. Keen, T. C. A. Lucas, J. A. Hriljac, and A. L. Goodwin, Phys. Rev. Lett. 116 (2016), 207602. By using a symmetry motivated basis to evaluate local distortions against pair distribution function data (PDF), we show without prior bias, that the off-centre Ti displacements in the archetypal ferroelectric BaTiO3 are zone centred and rhombohedral-like in natureRead more

Symmetry Switching of Negative Thermal Expansion by Chemical Control

By Mark | Ablitt, Publications | Comments are Closed | 4 May, 2016 | 0

Mark S. Senn, Claire A. Murray, Xuan Luo, Lihai Wang, Fei-Ting Huang, Sang-Wook Cheong, Alessandro Bombardi, Chris Ablitt, Arash A. Mostofi, and Nicholas C. Bristowe, J. Am. Chem. Soc., 10.1021/jacs.5b13192 The layered perovskite Ca3–xSrxMn2O7 is shown to exhibit a switching from a material exhibiting uniaxial negative to positive thermal expansion as a function of x.Read more

Charge localization in the Verwey structure of magnetite

By Mark | Publications | Comments are Closed | 15 February, 2016 | 0

Mark S. Senn, Jon P. Wright, James Cumby, and J. Paul Attfield, Phys. Rev. B 92 (2015), 024104. The thermal evolution of electronic order in the complex Verwey ground state of magnetite (Fe 3 O 4 )  has been determined through 22 high-accuracy synchrotron x-ray structure refinements using three 10–40μm  grains of stoichiometric magnetite. A robust fitting function isRead more

Negative thermal expansion in hybrid improper ferroelectric Ruddlesden-Popper perovskites by symmetry trapping

By Mark | Publications | Comments are Closed | 15 February, 2016 | 0

M. S. Senn, A. Bombardi, C. A. Murray, C. Vecchini, A. Scherillo, X. Luo, and S. W. Cheong, Phys. Rev. Lett. 114 (2015), 035701. We present new results on the microscopic nature of the ferroelectricity mechanisms in Ca 3 Mn 2 O 7   and Ca 3 Ti 2 O 7   . To the first approximation, we confirm the hybrid improper ferroelectric mechanism recently proposed by Benedek and FennieRead more

B-Cation Order Control of Magnetism in the 1322 Perovskite CaCu3Fe2Nb2O12

By Mark | Publications | Comments are Closed | 15 February, 2016 | 0

  Cation ordering in the 1322 perovskite CaCu3Fe2Nb2O12 has been investigated by synchrotron X-ray diffraction structure analysis, high-resolution electron microscopy, and magnetic measurements. All of the samples have full 1:3 ordering of Ca and Cu cations at the perovskite A-sites, but the Fe and Nb cations at the B sites show different degrees of orderingRead more

Charge density wave fluctuations in La 2− x Sr x CuO 4 and their competition with superconductivity

By Mark | Publications | Comments are Closed | 15 February, 2016 | 0

T. P. Croft, C. Lester, M. S. Senn, A. Bombardi, and S. M. Hayden, Phys. Rev. B 89 (2014), 224513 We report hard (14 keV) x-ray diffraction measurements on three compositions (x=0.11,0.12,0.13)  of the high-temperature superconductor La 2−x   Sr x   CuO 4   . All samples show charge density wave (CDW) order with onset temperatures in the range 51–80Read more

A half-metallic A-and B-site-ordered quadruple perovskite oxide CaCu3Fe2Re2O12 with large magnetization and a high transition temperature

By Mark | Publications | Comments are Closed | 15 February, 2016 | 0

Wei-tin Chen, Masaichiro Mizumaki, Hayato Seki,Mark S. Senn, Takashi Saito, Daisuke Kan, J. Paul Attfield & Yuichi Shimakawa, Nature Communications 5 (2014), 3909. Strong correlation between spins and conduction electrons is key in spintronic materials and devices. A few ferro- or ferrimagnetic transition metal oxides such as La1−xSrxMnO3, Fe3O4, CrO2 and Sr2FeMoO6 have spin-polarized conductionRead more

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  • Home
  • Group Members
    • Dr Mark Senn
    • Dr Nick Funnell
    • Evie Ladbrook
    • Ben Tragheim
    • Dr Struan Simpson
    • Dr Craig Hiley
    • Matt Edwards
    • Dr Catriona Crawford
    • Dr Robin Sjokvist
    • Dr Cameron Wilson
    • Elizabeth Arnold
    • Jaskaran Mangat
  • Research
  • Fundamental Science Matters
  • Publications
  • Funding
  • Group Meetings
  • Collaborators
  • Contact
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