Helen
Walker
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No
No
Yes


​I am a senior scientist with the ISIS Excitations Group, and I am currently co-responsible for the MERLIN Spectrometer.​​








​​Measured and simulated spin wave excitations in the multiferroic magnetic metal-organic framework (CD3)2ND2[Mn(DCO2)3]
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​I am an inelastic neutron scattering scientist, taking advantage of how neutrons interact with strongly correlated electron systems; in addition to exploiting X-rays, with which I have considerable experience after spending several years working at synchrotrons in France and Germany. My particular interests lie in the magnetic properties of f-electron systems and transition metal oxides, particularly multiferroics and 5d systems, and how scattering may be used to probe them statically and dynamically​. More recently I have started to investigate hybrid organic-inorganic materials such as Metal-Organic Frameworks (MOFs), due to the opportunities they offer for tailoring their diverse functionalities, which include multiferroicity, and the possibility to study fundamental magnetic properties in different dimensions. 

I am co-PI on an EPSRC grant to study phonons under pressure in barocaloric MOFs using neutrons in collaboration with Dr Anthony Phillips​ at QMUL. I am fortunate to be working with a fantastic PhD student: Bernet Meijer, and a brilliant postdoc: Richard Dixey.

I am the course co-ordinator for the ISIS Neutron Training Course, which runs annually for 35 participants to get hands on experience of using ISIS instruments. I have also lectured on neutron scattering at the Institute for Materials Discovery​ at University College London, the Nanotechnology Centre at the Gdansk University of Technology and the SISN Advanced School on Magnetism in Ispra, Italy.

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Selected recent publications

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Anomalous metamagnetism in the low carrier density Kondo lattice YbRh3Si7
Phys. Rev. X ​​8, 041047​ (2018)


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Magnetic excitations in non-collinear antiferromagnetic Weyl semimetal Mn3​Sn​ 
Npj Quant. Mat. ​​3, 63 (2018)


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​Fractionalized excitations in the partially magnetized spin liquid ​​candidate YbMgGaO4​​​
Nat. Commun. 9, 4138 (2018)


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Spin-liquid-like state in a spin-1/2 square-lattice antiferromagnet perovskite induced by d10–d0 cation mixing ​​

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Coloumb spin liquid in anion-disordered pyrochlore Tb2Hf2​O7
Nat. Commun. 8, 892 (2017)

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Magnetic structure and spin wave excitations in the multiferroic magnetic metal-organic framework (CD3)2ND2[Mn(DCO2)3]​
Phys. Rev. B 96, 094423 (2017)​


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Resonant x-ray spectroscopy of uranium intermetallics at the U M4,5 edges
Phys. Rev. B 95, 245103 (2017)​

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Evidence for a spinon Fermi surface in a triangular lattice quantum spin liquid candidate
Nature 540, 559 (2016)​

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Spin wave excitations in the tetragonal double perovskite Sr2CuWO6
Phys. Rev. B 94, 064411 (2016)

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Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2O7
Phys. Rev. Lett. 113, 147206 (2014)

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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)​

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Negative thermal expansion and antiferromagnetism in the actinide oxypnictide NpFeAsO
Phys. Rev. B 85, 174506 (2012)​

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Role of intrinsic disorder in the structural phase transition of magnetoelectric EuTiO3
Phys. Rev. B 85, 184107 (2012)​

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Femtoscale magnetically induced lattice distortions in multiferroic TbMnO3
Science 333, 1273 (2011)


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​Resonant X-ray Scattering Study of the URu2Si2 Hidden-order Phase
Phys. Rev. B 83, 193102 (2011)​


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Circularly Polarized X-Rays as a Probe of Noncollinear Magnetic Order in Multiferroic TbMnO3

Phys. Rev. Lett. 102, 237205 (2009)​​
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