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Electronic structure calculations for muon spectroscopy (2025)
Journal Article
Blundell, S. J., Bonacci, M., Bonfà, P., De Renzi, R., Huddart, B. M., Lancaster, T., Liborio, L. M., Onuorah, I. J., Pizzi, G., Pratt, F. L., & Wilkinson, J. M. (2025). Electronic structure calculations for muon spectroscopy. Electronic Structure, 7(2), Article 023001. https://doi.org/10.1088/2516-1075/adcb7c

Muon spectroscopy has become a leading tool for the investigation of local magnetic fields in condensed matter physics, finding applications in the study of superconductivity, magnetism, ionic diffusion in battery materials, and numerous other fields... Read More about Electronic structure calculations for muon spectroscopy.

Field-orientation-dependent magnetic phases in GdRu₂Si₂ probed with muon-spin spectroscopy (2025)
Journal Article
Huddart, B. M., Hernández-Melián, A., Wood, G. D. A., Mayoh, D. A., Gomilšek, M., Guguchia, Z., Wang, C., Hicken, T. J., Blundell, S. J., Balakrishnan, G., & Lancaster, T. (2025). Field-orientation-dependent magnetic phases in GdRu₂Si₂ probed with muon-spin spectroscopy. Physical Review B, 111(5), Article 054440. https://doi.org/10.1103/physrevb.111.054440

Centrosymmetric GdRu₂Si₂ exhibits a variety of multi-𝑄 magnetic states as a function of temperature and applied magnetic field, including a square skyrmion-lattice phase. The material's behavior is strongly dependent on the direction of the applied f... Read More about Field-orientation-dependent magnetic phases in GdRu₂Si₂ probed with muon-spin spectroscopy.

Anisotropic Skyrmion and Multi-q Spin Dynamics in Centrosymmetric Gd2PdSi3 (2025)
Journal Article
Gomilšek, M., Hicken, T., Wilson, M., Franke, K., Huddart, B., Štefančič, A., Holt, S., Balakrishnan, G., Mayoh, D., Birch, M., Moody, S., Luetkens, H., Guguchia, Z., Telling, M., Baker, P., Clark, S., & Lancaster, T. (2025). Anisotropic Skyrmion and Multi-q Spin Dynamics in Centrosymmetric Gd2PdSi3. Physical Review Letters, 134(4), Article 046702. https://doi.org/10.1103/physrevlett.134.046702

Skyrmions are particlelike vortices of magnetization with nontrivial topology, which are usually stabilized by Dzyaloshinskii-Moriya interactions (DMI) in noncentrosymmetric bulk materials. Exceptions are centrosymmetric Gd- and Eu-based skyrmion-lat... Read More about Anisotropic Skyrmion and Multi-q Spin Dynamics in Centrosymmetric Gd2PdSi3.

Magnetic structure and crystal-field states of antiferromagnetic CeNiGe3: Neutron scattering and μSR investigations (2024)
Journal Article
Kataria, A., Kumar, R., Adroja, D. T., Ritter, C., Anand, V. K., Hillier, A. D., Huddart, B. M., Lancaster, T., Rols, S., Koza, M. M., Langridge, S., & Sundaresan, A. (2024). Magnetic structure and crystal-field states of antiferromagnetic CeNiGe3: Neutron scattering and μSR investigations. Physical Review B, 110(18), Article 184412. https://doi.org/10.1103/physrevb.110.184412

We present the results of microscopic investigations of antiferromagnetic CeNiGe3 using neutron powder diffraction (NPD), inelastic neutron scattering (INS), and muon spin relaxation (μSR) measurements. CeNiGe3 crystallizes in a centrosymmetric ortho... Read More about Magnetic structure and crystal-field states of antiferromagnetic CeNiGe3: Neutron scattering and μSR investigations.

Weyl fermion excitations in the ideal Weyl semimetal CuTlSe2 (2024)
Journal Article
Wang, C. N., Tay, D., Dong, Q. X., Okvátovity, Z., Huddart, B. M., Ma, C. Y., Yokoyama, K., Yu, L., Lancaster, T., Chen, G. F., Ott, H.-R., & Shiroka, T. (2024). Weyl fermion excitations in the ideal Weyl semimetal CuTlSe2. Physical Review Research, 6(3), Article 033229. https://doi.org/10.1103/physrevresearch.6.033229

An ideal Weyl semimetal is characterized by a dispersion in which only Weyl cones intersect the Fermi level, with low-energy behavior being governed by Weyl fermions. Although ideal Weyl semimetals have long been anticipated, only a few are realized... Read More about Weyl fermion excitations in the ideal Weyl semimetal CuTlSe2.

Demonstration of Controlled Skyrmion Injection Across a Thickness Step (2024)
Journal Article
Littlehales, M. T., Moody, S. H., Turnbull, L. A., Huddart, B. M., Brereton, B. A., Balakrishnan, G., Fan, R., Steadman, P., Hatton, P. D., & Wilson, M. N. (2024). Demonstration of Controlled Skyrmion Injection Across a Thickness Step. Nano Letters, 24(22), 6813-6820. https://doi.org/10.1021/acs.nanolett.4c01605

Spintronic devices incorporating magnetic skyrmions have attracted significant interest recently. Such devices traditionally focus on controlling magnetic textures in 2D thin films. However, enhanced performance of spintronic properties through the e... Read More about Demonstration of Controlled Skyrmion Injection Across a Thickness Step.

Muon-spin relaxation investigation of magnetic bistability in a crystalline organic radical compound (2023)
Journal Article
Hernández-Melían, A., Huddart, B., Pratt, F., Blundell, S., Mills, M., Young, H., Preuss, K., & Lancaster, T. (2023). Muon-spin relaxation investigation of magnetic bistability in a crystalline organic radical compound. Journal of Physics and Chemistry of Solids, 181, https://doi.org/10.1016/j.jpcs.2023.111493

We present the results of a muon-spin relaxation (𝜇+SR) investigation of the crystalline organic radicalcompound 4-(2-benzimidazolyl)-1,2,3,5-dithiadiazolyl (HbimDTDA), in which we demonstrate the hystereticmagnetic switching of the system that takes... Read More about Muon-spin relaxation investigation of magnetic bistability in a crystalline organic radical compound.

μSR investigation of magnetism in κ−(ET)2X : Antiferromagnetism (2023)
Journal Article
Huddart, B., Lancaster, T., Blundell, S., Guguchia, Z., Taniguchi, H., Clark, S., & Pratt, F. (2023). μSR investigation of magnetism in κ−(ET)2X : Antiferromagnetism. Physical Review Research, 5(1), Article 013015. https://doi.org/10.1103/physrevresearch.5.013015

We study magnetism in the κ-(ET)2X family of charge-transfer salts using implanted muon spectroscopy in conjunction with detailed ab initio electronic structure calculations using density functional theory (DFT). ET stands for the electron donor mole... Read More about μSR investigation of magnetism in κ−(ET)2X : Antiferromagnetism.

MuFinder: A program to determine and analyse muon stopping sites (2022)
Journal Article
Huddart, B., Hernández-Melián, A., Hicken, T., Gomilšek, M., Hawkhead, Z., Clark, S., Pratt, F., & Lancaster, T. (2022). MuFinder: A program to determine and analyse muon stopping sites. Computer Physics Communications, 280, https://doi.org/10.1016/j.cpc.2022.108488

Significant progress has recently been made in calculating muon stopping sites using density functional theory. The technique aims to address two of the most common criticisms of the muon-spin spectroscopy (μ+SR) technique, namely, where in the sampl... Read More about MuFinder: A program to determine and analyse muon stopping sites.

Muon-Nitrogen Quadrupolar Level Crossing Resonance in a Charge Transfer Salt (2022)
Journal Article
Berlie, A., Pratt, F. L., Huddart, B. M., Lancaster, T., & Cottrell, S. P. (2022). Muon-Nitrogen Quadrupolar Level Crossing Resonance in a Charge Transfer Salt. Journal of Physical Chemistry C, 126(17), 7529-7534. https://doi.org/10.1021/acs.jpcc.2c00617

Although muons are primarily regarded as a local spin probe, they can also access the charge state of an atom or molecule via quadrupolar level crossing resonance (QLCR) spectroscopy. We use Li+TCNQ– (TCNQ = 7,7,8,8-tetracyanoquinodimethane), a simpl... Read More about Muon-Nitrogen Quadrupolar Level Crossing Resonance in a Charge Transfer Salt.

Energy-gap driven low-temperature magnetic and transport properties in Cr1/3MS2(M = Nb, Ta) (2022)
Journal Article
Hicken, T., Hawkhead, Z., Wilson, M., Huddart, B., Hall, A., Balakrishnan, G., Wang, C., Pratt, F., Clark, S., & Lancaster, T. (2022). Energy-gap driven low-temperature magnetic and transport properties in Cr1/3MS2(M = Nb, Ta). Physical Review B, 105(6), Article L060407. https://doi.org/10.1103/physrevb.105.l060407

The helimagnets Cr1/3MS2 (M = Nb or Ta) have attracted renewed attention due to the discovery of a chiral soliton lattice (CSL) stabilized in an applied magnetic field, but reports of unusual low-temperature transport and magnetic properties in this... Read More about Energy-gap driven low-temperature magnetic and transport properties in Cr1/3MS2(M = Nb, Ta).

Anomalous magnetic exchange in a dimerized quantum magnet composed of unlike spin species (2021)
Journal Article
Curley, S., Huddart, B., Kamenskyi, D., Coak, M., Williams, R., Ghannadzadeh, S., Schneider, A., Okubo, S., Sakurai, T., Ohta, H., Tidey, J., Graf, D., Clark, S., Blundell, S., Pratt, F., Telling, M., Lancaster, T., Manson, J., & Goddard, P. (2021). Anomalous magnetic exchange in a dimerized quantum magnet composed of unlike spin species. Physical Review B, 104(21), Article 214435. https://doi.org/10.1103/physrevb.104.214435

We present here a study of the magnetic properties of the antiferromagnetic dimer material CuVOF 4 ( H 2 O ) 6 ⋅ H 2 O , in which the dimer unit is composed of two different S = 1 / 2 species, Cu(II) and V(IV). An applied magnetic field of μ 0 H c 1... Read More about Anomalous magnetic exchange in a dimerized quantum magnet composed of unlike spin species.

Intrinsic nature of spontaneous magnetic fields in superconductors with time-reversal symmetry breaking (2021)
Journal Article
Huddart, B., Onuorah, I., Isah, M., Bonfa, P., Blundell, S., Clark, S., De Renzi, R., & Lancaster, T. (2021). Intrinsic nature of spontaneous magnetic fields in superconductors with time-reversal symmetry breaking. Physical Review Letters, 127(23), Article 237002. https://doi.org/10.1103/physrevlett.127.237002

We present a systematic investigation of muon-stopping states in superconductors that reportedly exhibit spontaneous magnetic fields below their transition temperatures due to time-reversal symmetry breaking. These materials include elemental rhenium... Read More about Intrinsic nature of spontaneous magnetic fields in superconductors with time-reversal symmetry breaking.

Quantum phases and spin liquid properties of 1T-TaS2 (2021)
Journal Article
Mañas-Valero, S., Huddart, B. M., Lancaster, T., Coronado, E., & Pratt, F. L. (2021). Quantum phases and spin liquid properties of 1T-TaS2. npj Quantum Materials, 6(1), Article 69. https://doi.org/10.1038/s41535-021-00367-w

Quantum materials exhibiting magnetic frustration are connected to diverse phenomena, including high Tc superconductivity, topological order, and quantum spin liquids (QSLs). A QSL is a quantum phase (QP) related to a quantum-entangled fluid-like sta... Read More about Quantum phases and spin liquid properties of 1T-TaS2.

Magnetic order and ballistic spin transport in a sine-Gordon spin chain (2021)
Journal Article
Huddart, B., Gomilšek, M., Hicken, T., Pratt, F., Blundell, S., Goddard, P., Kaech, S., Manson, J., & Lancaster, T. (2021). Magnetic order and ballistic spin transport in a sine-Gordon spin chain. Physical Review B, 103(6), Article L060405. https://doi.org/10.1103/physrevb.103.l060405

We report the results of muon-spin spectroscopy (μ+SR) measurements on the staggered molecular spin chain [pym-Cu(NO3 )2(H2O)2] (pym = pyrimidine), a material previously described using sine-Gordon field theory. Zero-field μ+SR reveals a long range m... Read More about Magnetic order and ballistic spin transport in a sine-Gordon spin chain.

Megahertz dynamics in skyrmion systems probed with muon-spin relaxation (2021)
Journal Article
Hicken, T., Wilson, M., Franke, K., Huddart, B., Hawkhead, Z., Gomilšek, M., Clark, S., Pratt, F., Štefančič, A., Hall, A., Ciomaga Hatnean, M., Balakrishnan, G., & Lancaster, T. (2021). Megahertz dynamics in skyrmion systems probed with muon-spin relaxation. Physical Review B, 103(2), https://doi.org/10.1103/physrevb.103.024428

We present longitudinal-field muon-spin relaxation (LF μ SR ) measurements on two systems that stabilize a skyrmion lattice (SkL): Cu 2 OSeO 3 , and Co x Zn y Mn 20 − x − y for ( x , y ) = ( 10 , 10 ) , (8, 9), and (8, 8). We find that the SkL phase... Read More about Megahertz dynamics in skyrmion systems probed with muon-spin relaxation.

Position-dependent stability and lifetime of the skyrmion state in nickel-substituted Cu2OSeO3 (2020)
Journal Article
Crisanti, M., Birch, M., Wilson, M., Moody, S., Štefančič, A., Huddart, B., Cabeza, S., Balakrishnan, G., Hatton, P., & Cubitt, R. (2020). Position-dependent stability and lifetime of the skyrmion state in nickel-substituted Cu2OSeO3. Physical Review B, 102(22), Article 224407. https://doi.org/10.1103/physrevb.102.224407

We report spatially resolved small-angle neutron-scattering measurements of the conical and skyrmion states of a bulk single crystal of nickel-substituted Cu2OSeO3, with a nominal concentration of Ni of 14%. We observe a significant spatial dependenc... Read More about Position-dependent stability and lifetime of the skyrmion state in nickel-substituted Cu2OSeO3.

Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange (2020)
Journal Article
Xiao, F., Blackmore, W., Huddart, B., Gomilšek, M., Hicken, T., Baines, C., Baker, P., Pratt, F., Blundell, S., Lu, H., Singleton, J., Gawryluk, D., Turnbull, M., Krämer, K., Goddard, P., & Lancaster, T. (2020). Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange. Physical Review B, 102(17), Article 174429. https://doi.org/10.1103/physrevb.102.174429

We present an investigation of the effect of randomizing exchange coupling strengths in the S = 1/2 square lattice quasi-two-dimensional quantum Heisenberg antiferromagnet (QHAF) (QuinH)2Cu(ClxBr1−x )4 · 2H2O (QuinH = Quinolinium, C9H8N+), with 0 x 1... Read More about Magnetic order and disorder in a quasi-two-dimensional quantum Heisenberg antiferromagnet with randomized exchange.