Dr. Chris Stock

Position:
Reader
Research Theme:
Condensed Matter and Photonics
Research Group:
Hard Condensed Matter
Institution:
Edinburgh
Email address:
cstock@ed.ac.uk
Telephone number:
+44 (0) 1316517066
Address:
School of Physics and Astronomy, James Clerk Maxwell Building, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom

Research interests

My research interests include the application of scattering techniques to the study of strongly correlated electronic and magnetic systems.  The primary focus is on neutron scattering which is sensitive to both nuclear and magnetic cross sections.  

 There are two particular topics of interest.  

 1) Quantum phase transitions and superconductivity - Metallic systems where quantum fluctuations dominate often reveal new phases and transitions in materials.  Examples of such cases is the presence of high temperature superconductivity in iron and copper based systems.  Other examples include systems based upon 4f elements which display unusual metallic properties at low temperatures.  Owing to the presence of strong electronic correlations and local magnetism in these materials, neutron scattering can provide a unique and bulk probe of the microscopic properties.

 2) Ferroelectricity and magnetism in oxides - The existence of magnetism and ferroelectricity are usually considered exclusive, but there has been a discovery of a series of materials where both properties coexist and are even coupled.  The prospect of tuning a ferroelectric moment with a magnetic field, or a magnetic moment with an electric field, has broad applications to industry and novel devices.  Magnets where the interactions are frustrated, or cancel, as a result of lattice geometry provide a natural framework for searching for new multiferroic materials.  Given that neutrons are sensitive to both nuclear and magnetic cross sections, they provide an optimal technique for studying these systems and investigating their properties as a function of an external field.

 Beyond the use of scattering to investigate these systems, I am also interested in synthesizing new materials and optimizing this for the production of large samples for neutrons.  Bulk characterization, including heat capacity and susceptibility, are also used to support scattering measurements.

Teaching

contributer - CM-DTC graduate course in probes of condensed matter (2012-2014)

contributer - CM-DTC graduate course in magnetism (2012-2015)

contributer - Physics Skills (2012-present)

contributer - Group projects (2012-present)

contributer - Semester and MPhys projects (2013-present)

coordinator - Third year quantum mechanics (2014-present)

Research outputs

  1. Spontaneous decay of a soft optical phonon in the relaxor ferroelectric PbMg1/3Nb2/3O3 DOI
    C. Stock, P. M. Gehring, R. A. Ewings, Z. G. Xu, J. Li, D. Viehland and H. Luo, Physical Review Materials, 2, 2 (2018)
  2. Orphan Spins in the S=5/2 Antiferromagnet CaFe2O4 DOI
    C. Stock, E. E. Rodriguez, N. Lee, F. Demmel, P. Fouquet, M. Laver, Ch. Niedermayer, Y. Su, K. Nemkovski, M. A. Green et al., Physical Review Letters, 119, 25 (2017)
  3. Phantom phonon localization in relaxors DOI
    Peter M. Gehring, Dan Parshall, Leland Harriger, Chris Stock, Guangyong Xu, Xiaobing Li and Haosu Luo, Nature Communications, 8 (2017)
  4. Molecular orientational melting within a lead-halide octahedron framework DOI
    K. L. Brown, S. F. Parker, I. Robles Garcia, S. Mukhopadhyay, V. Garcia Sakai and C. Stock, Physical Review B: Condensed Matter and Materials Physics, 96, 17 (2017)
  5. Evidence for the confinement of magnetic monopoles in quantum spin ice DOI
    P. M. Sarte, A. A. Aczel, G Ehlers, C. Stock, B. D. Gaulin, C. Mauws, M. B. Stone, S. Calder, S. E. Nagler, J. W. Hollett et al., Journal of Physics: Condensed Matter, 29, 45 (2017)
  6. Transverse acoustic phonon anomalies at intermediate wave vectors in MgV2O4 DOI
    T. Weber, B. Roessli, C. Stock, T. Keller, K. Schmalzl, F. Bourdarot, R. Georgii, R. A. Ewings, R. S. Perry and P. Boeni, Physical Review B: Condensed Matter and Materials Physics, 96, 18 (2017)
  7. Crystal field excitations and magnons DOI
    R. K. Oogarah, C. P. J. Stockdale, C. Stock, J. S. O. Evans, A. S. Wills, J. W. Taylor and E. E. McCabe, Physical Review B: Condensed Matter and Materials Physics, 95, 17 (2017)
  8. Competing spin density wave, collinear, and helical magnetism in Fe1+xTe DOI
    C. Stock, E. E. Rodriguez, P. Bourges, R. A. Ewings, H. Cao, S. Chi, J. A. Rodriguez-Rivera and M. A. Green, Physical Review B: Condensed Matter and Materials Physics, 95, 14 (2017)
  9. Inelastic x-ray investigation of the ferroelectric transition in SnTe DOI
    Christopher D. O'Neill, Dmitry A. Sokolov, Andreas Hermann, Alexei Bossak, Christopher Stock and Andrew D. Huxley, Physical Review B: Condensed Matter and Materials Physics, 95, 14 (2017)
  10. Structure and magnetism in the bond-frustrated spinel ZnCr2Se4 DOI
    P. Zajdel, W. -Y. Li, W. van Beek, A. Lappas, A. Ziolkowska, S. Jaskiewicz, C. Stock and M. A. Green, Physical Review B: Condensed Matter and Materials Physics, 95, 13 (2017)
Last updated: 19 Feb 2018 at 21:11