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Professor Tom Lancaster's Outputs (115)

Magnetic transition and spin dynamics in the triangular Heisenberg antiferromagnet α-KCrO2 (2013)
Journal Article
Xiao, F., Lancaster, T., Baker, P., Pratt, F., Blundell, S., Möller, J., …Jansen, M. (2013). Magnetic transition and spin dynamics in the triangular Heisenberg antiferromagnet α-KCrO2. Physical review B, 88(18), Article 180401(R). https://doi.org/10.1103/physrevb.88.180401

We present the results of muon-spin relaxation measurements on the triangular lattice Heisenberg antiferromagnet α -KCrO 2 . We observe sharp changes in behavior at an ordering temperature of T c =23 K, with an additional broad feature in the muon-sp... Read More about Magnetic transition and spin dynamics in the triangular Heisenberg antiferromagnet α-KCrO2.

Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives (2013)
Journal Article
Wright, J., Pitcher, M., Trevelyan-Thomas, W., Lancaster, T., Baker, P., Pratt, F., …Blundell, S. (2013). Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives. Physical review B, 88(6), Article 060401. https://doi.org/10.1103/physrevb.88.060401

We present detailed magnetometry and muon-spin rotation data on polycrystalline samples of overdoped, nonsuperconducting LiFe1−xNixAs (x = 0.1,0.2) and Li1−yFe1+yAs (0 y 0.04) as well as superconducting LiFeAs.While LiFe1−xNixAs exhibits weak antifer... Read More about Magnetic fluctuations and spin freezing in nonsuperconducting LiFeAs derivatives.

Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch (2013)
Journal Article
Ghannadzadeh, S., Möller, J., Goddard, P., Lancaster, T., Xiao, F., Blundell, S., …Schlueter, J. (2013). Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch. Physical review B, 87(24), Article 241102. https://doi.org/10.1103/physrevb.87.241102

We present the results of high-field magnetization and muon-spin relaxation measurements on the coordination polymer CuF 2 (H 2 O) 2 (pyrazine) in pressures up to 22.5 kbar. We observe a transition from a quasi-two-dimensional to a quasi-one-dimensio... Read More about Evolution of magnetic interactions in a pressure-induced Jahn-Teller driven magnetic dimensionality switch.

Weak magnetic transitions in pyrochlore Bi2Ir2O7 (2013)
Journal Article
Baker, P., Möller, J., Pratt, F., Hayes, W., Blundell, S., Lancaster, T., …Cao, G. (2013). Weak magnetic transitions in pyrochlore Bi2Ir2O7. Physical review B, 87(18), Article 180409. https://doi.org/10.1103/physrevb.87.180409

Muon spin relaxation measurements on Bi 2 Ir 2 O 7 show that it undergoes a bulk magnetic transition at 1.84(3) K. This is accompanied by increases in the muon spin relaxation rate and the amplitude of the nonrelaxing part of the signal. The magnetic... Read More about Weak magnetic transitions in pyrochlore Bi2Ir2O7.

A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2 (2013)
Journal Article
Berlie, A., Terry, I., Giblin, S., Lancaster, T., & Szablewski, M. (2013). A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2. Journal of Applied Physics, 113(17), Article 17E304. https://doi.org/10.1063/1.4798616

An investigation of the magnetism of the deuterated form of the metal-organic ferromagnet Ni(TCNQ)2 using the muon spin relaxation technique, is reported. Ni(TCNQ-D4)2 was synthesized in a similar manner to the protio-form, and the crystalline produc... Read More about A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2.

Quantum states of muons in fluorides (2013)
Journal Article
Moeller, J., Ceresoli, D., Lancaster, T., Marzari, N., & Blundell, S. (2013). Quantum states of muons in fluorides. Physical review B, 87(12), Article 121108. https://doi.org/10.1103/physrevb.87.121108

Muon-spin relaxation (μ + SR) is a sensitive probe of magnetism, but its utility can be severely limited by the lack of knowledge of the muon implantation site and the extent to which the muon perturbs its host. We demonstrate systematically that the... Read More about Quantum states of muons in fluorides.

Low-Field Superconducting Phase of (TMTSF)2ClO4 (2013)
Journal Article
Pratt, F., Lancaster, T., Blundell, S., & Baines, C. (2013). Low-Field Superconducting Phase of (TMTSF)2ClO4. Physical Review Letters, 110(10), Article 107005. https://doi.org/10.1103/physrevlett.110.107005

The low-field phase of the organic superconductor (TMTSF) 2 ClO 4 is studied by muon-spin rotation. The zero temperature limit of the magnetic penetration depth within the TMTSF layers is obtained to be λ ab (0)=0.86(2)  μm . Temperature dependence o... Read More about Low-Field Superconducting Phase of (TMTSF)2ClO4.

Enhancement of the superconducting transition temperature of FeSe by intercalation of a molecular spacer layer (2013)
Journal Article
Burrard-Lucas, M., Free, D. G., Sedlmaier, S. J., Wright, J. D., Cassidy, S. J., Hara, Y., …Clarke, S. J. (2013). Enhancement of the superconducting transition temperature of FeSe by intercalation of a molecular spacer layer. Nature Materials, 12(1), 15-19. https://doi.org/10.1038/nmat3464

The discovery of high-temperature superconductivity in a layered iron arsenide1 has led to an intensive search to optimize the superconducting properties of iron-based superconductors by changing the chemical composition of the spacer layer between a... Read More about Enhancement of the superconducting transition temperature of FeSe by intercalation of a molecular spacer layer.

Persistent dynamics in the S = 1/2 quasi-one-dimensional chain compound Rb4Cu(MoO4)3 probed with muon-spin relaxation (2012)
Journal Article
Lancaster, T., Baker, P., Pratt, F., Blundell, S., Hayes, W., & Prabhakaran, D. (2012). Persistent dynamics in the S = 1/2 quasi-one-dimensional chain compound Rb4Cu(MoO4)3 probed with muon-spin relaxation. Physical review B, 85(18), Article 184404. https://doi.org/10.1103/physrevb.85.184404

We report the results of muon-spin relaxation measurements on the low-dimensional antiferromagnet Rb4Cu(MoO4)3. No long-range magnetic order is observed down to 50 mK implying a ratio TN/J < 0.005 (where J is the principal exchange strength along the... Read More about Persistent dynamics in the S = 1/2 quasi-one-dimensional chain compound Rb4Cu(MoO4)3 probed with muon-spin relaxation.

Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3 (2012)
Journal Article
Choi, S., Coldea, R., Kolmogorov, A., Lancaster, T., Mazin, I., Blundell, S., …Taylor, J. (2012). Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3. Physical Review Letters, 108(12), Article 127204. https://doi.org/10.1103/physrevlett.108.127204

We report inelastic neutron scattering measurements on Na2IrO3, a candidate for the Kitaev spin model on the honeycomb lattice. We observe spin-wave excitations below 5 meV with a dispersion that can be accounted for by including substantial further-... Read More about Spin Waves and Revised Crystal Structure of Honeycomb Iridate Na2IrO3.

Dimensionality Selection in a Molecule-Based Magnet (2012)
Journal Article
Goddard, P. A., Manson, J. L., Singleton, J., Franke, I., Lancaster, T., Steele, A. J., …Schlueter, J. A. (2012). Dimensionality Selection in a Molecule-Based Magnet. Physical Review Letters, 108(7), Article 077208. https://doi.org/10.1103/physrevlett.108.077208

Gaining control of the building blocks of magnetic materials and thereby achieving particular characteristics will make possible the design and growth of bespoke magnetic devices. While progress in the synthesis of molecular materials, and especially... Read More about Dimensionality Selection in a Molecule-Based Magnet.

Design and commissioning of a high magnetic field muon spin relaxation spectrometer at the ISIS pulsed neutron and muon source (2011)
Journal Article
Lord, J., McKenzie, I., Baker, P., Blundell, S., Cottrell, S., Giblin, S., …Salman, Z. (2011). Design and commissioning of a high magnetic field muon spin relaxation spectrometer at the ISIS pulsed neutron and muon source. Review of Scientific Instruments, 82(7), https://doi.org/10.1063/1.3608114

The high magnetic field (HiFi) muon instrument at the ISIS pulsed neutron and muon source is a state-of-the-art spectrometer designed to provide applied magnetic fields up to 5 T for muon studies of condensed matter and molecular systems. The spectro... Read More about Design and commissioning of a high magnetic field muon spin relaxation spectrometer at the ISIS pulsed neutron and muon source.

Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO(1-x)F(x) measured by muon spin rotation (2008)
Journal Article
Drew, A., Pratt, F., Lancaster, T., Blundell, S., Baker, P., Liu, R., …Bernhard, C. (2008). Coexistence of magnetic fluctuations and superconductivity in the pnictide high temperature superconductor SmFeAsO(1-x)F(x) measured by muon spin rotation. Physical Review Letters, 101(9), Article 097010. https://doi.org/10.1103/physrevlett.101.097010