# Dr. Chris Stock

Position:
Research Theme:
Condensed Matter and Photonics
Research Group:
Hard Condensed Matter
Institution:
Edinburgh
cstock@ed.ac.uk
Telephone number:
+44 (0) 1316517066
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. Ordered magnetism in the intrinsically decorated jeﬀ = 1 2 α-CoV3O8 DOI
Paul Sarte, A. M. Arevalo-Lopez, M. Songvilay, D Le, T Guidi, V Garcia-Sakai, S Mukhopadhyay, S Capelli, W.D. Ratcliff, Ka hou Hong et al., Physical Review B: Condensed Matter and Materials Physics (2018)
2. Lifetime shortened acoustic phonons and static order at the Brillouin zone boundary in the organic-inorganic perovskite CH3NH3PbCl3
M. Songvilay, M Bari, Z.-G. Ye, Guangyong Xu, P M Gehring, W. D. Ratcliff, K. Schmalzl, F. Bourdarot, B Roessli and Christopher Stock, Physical Review Materials (2018)
3. Ordered magnetism in the intrinsically decorated $j\rm{_{eff}}$ = $\frac{1}{2}$ $α$-CoV$_{3}$O$_{8}$
P. M. Sarte, A. A. Arévalo-López, M. Songvilay, D. Le, T. Guidi, V. García-Sakai, S. Mukhopadhyay, S. C. Capelli, W. D. Ratcliff, K. H. Hong et al., Physical Review B: Condensed Matter and Materials Physics (2018)
4. Anharmonic Magnon Excitations in Noncollinear and Charge-Ordered RbFe2+Fe3+F6 DOI
M. Songvilay, E. E. Rodriguez, R. Lindsay, M. A. Green, H. C. Walker, J. A. Rodriguez-Rivera and C. Stock, Physical Review Letters, 121, 8 (2018)
5. Incommensurate atomic and magnetic modulations in the spin-frustrated beta-NaMnO2 triangular lattice DOI
Fabio Orlandi, Eleni Aza, Ioanna Bakaimi, Klaus Kiefer, Bastian Klemke, Andrej Zorko, Denis Arcon, Christopher Stock, George D. Tsibidis, Mark A. Green et al., Physical Review Materials, 2, 7 (2018)
6. From Ising Resonant Fluctuations to Static Uniaxial Order in Antiferromagnetic and Weakly Superconducting CeCo(In1-xHgx)(5) (x=0.01) DOI
C. Stock, J. A. Rodriguez-Rivera, K. Schmalzl, F. Demmel, D. K. Singh, F. Ronning, J. D. Thompson and E. D. Bauer, Physical Review Letters, 121, 3 (2018)
7. Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice DOI
P. M. Sarte, R. A. Cowley, E. E. Rodriguez, E. Pachoud, D. Le, V. Garcia-Sakai, J. W. Taylor, C. D. Frost, D. Prabhakaran, C. MacEwen et al., Physical Review B: Condensed Matter and Materials Physics, 98, 2 (2018)
8. From mean-field localized magnetism to itinerant spin fluctuations in the "nonmetallic metal" FeCrAs DOI
K. W. Plumb, C. Stock, J. A. Rodriguez-Rivera, J. -P. Castellan, J. W. Taylor, B. Lau, W. Wu, S. R. Julian and Young-June Kim, Physical Review B: Condensed Matter and Materials Physics, 97, 18 (2018)
9. Depth dependant element analysis of PbMg1/3Nb2/3O3 using muonic x-rays DOI
K. L. Brown, C. P. J. Stockdale, H. Luo, X. Zhao, J-F Li, D. Viehland, Z. G. Xu, P. M. Gehring, Kenji Ishida, A. D. Hillier et al., Journal of Physics: Condensed Matter, 30, 12 (2018)
10. 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)
Last updated: 19 Feb 2018 at 21:11