Dr Helen Walker

Location R 3, 1. 35
Rutherford Appleton Laboratory
E-mail helen.c.walker@stfc.ac.uk
Telephone (office) +44 (0) 1235 821900
Mobile (short code) 1623 (only works when dialed on site)

Introduction and profile

I am a scientist with the ISIS Excitations and Polarised Neutrons Group, and I am co-responsible for the MERLIN spectrometer.

Research and development interests

After several years working at synchrotrons, I have recently changed to become a neutron scientist to take advantage of neutron scattering for the study of strongly correlated electron systems. My particular interests lie in the magnetic properties of f-electron systems and transition metal oxides, particularly multiferroics and 5d systems.

Selected recent publications

H. C. Walker, F. Fabrizi, L. Paolasini, F. de Bergevin, D. Prabhakaran, A. T. Boothroyd, and D. F. McMorrow
Circularly polarized x-ray scattering investigation of spin-lattice coupling in TbMnO3 in crossed electric and magnetic fields
Phys. Rev. B 88, 214415 (2013)

S. Boseggia, R. Springell, H. C. Walker, H. M. Ronnow, Ch. Rüegg, H. Okabe, M. Isobe, R. S. Perry, S. P. Collins and D. F. McMorrow
Robustness of basal-plane antiferromagnetic order and the Jeff=1/2 state to structural distortions in single-layer spin-orbit Mott insulators

Phys. Rev. Lett. 110, 117207 (2013)

T. Klimczuk, H. C. Walker, R. Springell, A. B. Shick, A. H. Hill, P. Gaczynski, K. Gofryk, S. A. J. Kimber, C. Ritter, E. Colineau, J.-C. Griveau, D. Bouxière, R. Eloirdi, R. J. Cava, R. Caciuffo,
Negative thermal expansion and antiferromagnetism in the actinide oxypnictide NpFeAsO

Phys. Rev. B 85, 174506 (2012)

F. de Bergevin, L. Paolasini, H. Walker, A. Boothroyd, F. Fabrizi, D. Prabhakaran & D. McMorrow
Illuminating the magnetism of multiferroics by polarised X-rays
Notiziario Neutroni e Luce di Sincrotrone 17, 10 (2012)

H. C. Walker, F. Fabrizi, L. Paolasini, F. de Bergevin, J. Herrero-Martin, A. T. Boothroyd, D. Prabhakaran & D. F. McMorrow
Femtoscale magnetically induced lattice distortions in multiferroic TbMnO3
Science 333, 1273 (2011)

H. C. Walker, R. Caciuffo, D. Aoki, F. Bourdarot, G. H. Lander and J. Flouquet
Resonant X-ray Scattering Study of the URu2Si2 Hidden-order Phase
Phys. Rev. B 83, 193102 (2011)

F. Fabrizi, H. C. Walker, L. Paolasini, F. de Bergevin, T. Fennell, N. Rogado, R. J. Cava, Th. Wolf, M. Kenzelmann, and D. F. McMorrow
Electric field control of multiferroic domains in Ni3V2O8 imaged by x-ray polarization-enhanced topography
Phys. Rev. B 82, 024434 (2010)

F. Fabrizi, H. C. Walker, L. Paolasini, F. de Bergevin, A. T. Boothroyd,
D. Prabhakaran, and D. F. McMorrow
Circularly Polarized X-Rays as a Probe of Noncollinear Magnetic Order in Multiferroic TbMnO3
Phys. Rev. Lett. 102, 237205 (2009)

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