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Investigating the magnetic ground state of the skyrmion host material Cu2OSeO3 using long-wavelength neutron diffraction (2019)
Journal Article
Franke, K., Dean, P., Hatnean, M. C., Birch, M., Khalyavin, D., Manuel, P., Lancaster, T., Balakrishnan, G., & Hatton, P. (2019). Investigating the magnetic ground state of the skyrmion host material Cu2OSeO3 using long-wavelength neutron diffraction. AIP Advances, 9(12), Article 125228. https://doi.org/10.1063/1.5129400

We present long-wavelength neutron diffraction data measured on both single crystal and polycrystalline samples of the skyrmion host material Cu2OSeO3. We observe magnetic satellites around the (01⎯⎯1) diffraction peak not accessible to other techniq... Read More about Investigating the magnetic ground state of the skyrmion host material Cu2OSeO3 using long-wavelength neutron diffraction.

Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets (2019)
Journal Article
Blackmore, W., Brambleby, J., Lancaster, T., Clark, S., Johnson, R., Singleton, J., Ozarowski, A., Schlueter, J., Chen, Y.-S., Arif, A., Lapidus, S., Xiao, F., Williams, R., Blundell, S., Pearce, M., Lees, M., Manuel, P., Villa, D., Villa, J., Manson, J., & Goddard, P. (2019). Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets. New Journal of Physics, 21(9), https://doi.org/10.1088/1367-2630/ab3dba

Although low-dimensional S = 1 antiferromagnets remain of great interest, difficulty in obtaining highquality single crystals of the newest materials hinders experimental research in this area. Polycrystalline samples are more readily produced, but t... Read More about Determining the anisotropy and exchange parameters of polycrystalline spin-1 magnets.

Increased lifetime of metastable skyrmions by controlled doping (2019)
Journal Article
Birch, M., Takagi, R., Seki, S., Wilson, M., Kagawa, F., Štefančič, A., Balakrishnan, G., Fan, R., Steadman, P., Ottley, C., Crisanti, M., Cubitt, R., Lancaster, T., Tokura, Y., & Hatton, P. (2019). Increased lifetime of metastable skyrmions by controlled doping. Physical review B - Condensed Matter and Materials Physics, 100(1), Article 014425. https://doi.org/10.1103/physrevb.100.014425

Previous observations of metastable magnetic skyrmions have shown that close to the equilibrium pocket the metastable state has a short lifetime, and therefore, rapid cooling is required to generate a significant skyrmion population at low temperatur... Read More about Increased lifetime of metastable skyrmions by controlled doping.

Probing magnetic order and disorder in the one-dimensional molecular spin chains CuF2(pyz) and [Ln(hfac)3(boaDTDA)] n (Ln  =  Sm, La) using implanted muons (2019)
Journal Article
Lancaster, T., Huddart, B., Williams, R., Xiao, F., Franke, K., Baker, P., Pratt, F., Blundell, S., Schlueter, J., Mills, M., Maahs, A., & Preuss, K. (2019). Probing magnetic order and disorder in the one-dimensional molecular spin chains CuF2(pyz) and [Ln(hfac)3(boaDTDA)] n (Ln  =  Sm, La) using implanted muons. Journal of Physics: Condensed Matter, 31(39), Article 394002. https://doi.org/10.1088/1361-648x/ab2cb6

We present the results of muon-spin relaxation (SR) measurements on antiferromagnetic and ferromagnetic spin chains. In antiferromagnetic CuF2(pyz) we identify a transition to long range magnetic order taking place at K, allowing us to estimate a rat... Read More about Probing magnetic order and disorder in the one-dimensional molecular spin chains CuF2(pyz) and [Ln(hfac)3(boaDTDA)] n (Ln  =  Sm, La) using implanted muons.

Local magnetism, magnetic order and spin freezing in the "nonmetallic metal" FeCrAs (2019)
Journal Article
Huddart, B., Birch, M. T., Pratt, F., Blundell, S., Porter, D. G., Clark, S. J., …Lancaster, T. (2019). Local magnetism, magnetic order and spin freezing in the "nonmetallic metal" FeCrAs. Journal of Physics: Condensed Matter, 31(28), Article 285803. https://doi.org/10.1088/1361-648x/ab151f

We present the results of x-ray scattering and muon-spin relaxation (SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120° periodicity expected from the suggested three-fold sy... Read More about Local magnetism, magnetic order and spin freezing in the "nonmetallic metal" FeCrAs.

Emergence and topological order in classical and quantum systems (2019)
Journal Article
McLeish, T., Pexton, M., & Lancaster, T. (2019). Emergence and topological order in classical and quantum systems. Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics, 66, 155-169. https://doi.org/10.1016/j.shpsb.2019.02.006

There has been growing interest in systems in condensed matter physics as a potential source of examples of both epistemic and ontological emergence. One of these case studies is the fractional quantum Hall state (FQHS). In the FQHS a system of elect... Read More about Emergence and topological order in classical and quantum systems.

Unconventional Field-Induced Spin Gap in an S=1/2 Chiral Staggered Chain (2019)
Journal Article
Liu, J., Kittaka, S., Johnson, R., Lancaster, T., Singleton, J., Sakakibara, T., Kohama, Y., van Tol, J., Ardavan, A., Williams, B., Blundell, S., Manson, Z., Manson, J., & Goddard, P. (2019). Unconventional Field-Induced Spin Gap in an S=1/2 Chiral Staggered Chain. Physical Review Letters, 122(5), Article 057207. https://doi.org/10.1103/physrevlett.122.057207

We investigate the low-temperature magnetic properties of the molecule-based chiral spin chain ½CuðpymÞðH2OÞ4SiF6 · H2O (pym ¼ pyrimidine). Electron-spin resonance, magnetometry and heat capacity measurements reveal the presence of staggered g tensor... Read More about Unconventional Field-Induced Spin Gap in an S=1/2 Chiral Staggered Chain.

Spin Jahn-Teller antiferromagnetism in CoTi2O5 (2019)
Journal Article
Kirschner, F. K., Johnson, R. D., Lang, F., Khalyavin, D. D., Manuel, P., Lancaster, T., Prabhakaran, D., & Blundell, S. J. (2019). Spin Jahn-Teller antiferromagnetism in CoTi2O5. Physical Review B, 99(6), Article 064403. https://doi.org/10.1103/physrevb.99.064403

We have used neutron powder diffraction to solve the magnetic structure of orthorhombic CoTi2O5, showing that the long-range ordered state below 26 K identified in our muon-spin rotation experiments is antiferromagnetic with propagation vector k = (±... Read More about Spin Jahn-Teller antiferromagnetism in CoTi2O5.