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Crystal structure inside calcium fluoride with an implanted muon
Credit: SJB

Professor Stephen Blundell

Professor of Physics

Research theme

  • Quantum materials

Sub department

  • Condensed Matter Physics

Research groups

  • Muons and magnets
Stephen.Blundell@physics.ox.ac.uk
Telephone: 01865 (2)72347
Clarendon Laboratory, room 108
  • About
  • Books
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  • Research
  • Publications

Information and Decoherence in a Muon-Fluorine Coupled System

PHYSICAL REVIEW LETTERS 125:8 (2020) 87201

Authors:

Jm Wilkinson, Sj Blundell
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Magnetic monopole noise

Nature Springer Nature 571:7764 (2019) 234-239

Authors:

R Dusad, Franziska Kirschner, JC Hoke, BR Roberts, A Eyal, F Flicker, GM Luke, Stephen Blundell, James Davis

Abstract:

Magnetic monopoles1-3 are hypothetical elementary particles with quantized magnetic charge. In principle, a magnetic monopole can be detected by the quantized jump in magnetic flux that it generates upon passage through a superconducting quantum interference device (SQUID)4. Following the theoretical prediction that emergent magnetic monopoles should exist in several lanthanide pyrochlore magnetic insulators5,6, including Dy2Ti2O7, the SQUID technique has been proposed for their direct detection6. However, this approach has been hindered by the high number density and the generation-recombination fluctuations expected of such thermally generated monopoles. Recently, theoretical advances have enabled the prediction of the spectral density of magnetic-flux noise from monopole generation-recombination fluctuations in these materials7,8. Here we report the development of a SQUID-based flux noise spectrometer and measurements of the frequency and temperature dependence of magnetic-flux noise generated by Dy2Ti2O7 crystals. We detect almost all of the features of magnetic-flux noise predicted for magnetic monopole plasmas7,8, including the existence of intense magnetization noise and its characteristic frequency and temperature dependence. Moreover, comparisons of simulated and measured correlation functions of the magnetic-flux noise indicate that the motions of magnetic charges are strongly correlated. Intriguingly, because the generation-recombination time constant for Dy2Ti2O7 is in the millisecond range, magnetic monopole flux noise amplified by SQUID is audible to humans.
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A.C. susceptibility as a probe of low-frequency magnetic dynamics

Journal of Physics: Condensed Matter IOP Publishing 31:1 (2018)

Authors:

Craig Topping, Stephen Blundell

Abstract:

The experimental technique of a.c. susceptibility can be used as a probe of magnetic dynamics in a wide variety of systems. Its use is restricted to the low- frequency regime and thus is sensitive to relatively slow processes. Rather than measuring the dynamics of single spins, a.c. susceptibility can be used to probe the dynamics of collective objects, such as domain walls in ferromagnets or vortex matter in superconductors. In some frustrated systems, such as spin glasses, the complex interactions lead to substantial spectral weight of fluctuations in the low-frequency regime, and thus a.c. susceptibility can play a unique role. We review the theory underlying the technique and magnetic dynamics more generally and give applications of a.c. susceptibility to a wide variety of experimental situations.
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$μ$SR study of magnetic order in the organic quasi-one-dimensional ferromagnet F4BImNN

Phys. Rev. B American Physical Society 88:6 (2013) 064423-064423

Authors:

Stephen J Blundell, Johannes S Möller, Tom Lancaster, Peter J Baker, Francis L Pratt, Gonca Seber, Paul M Lahti
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$μ$SR study of magnetic order in the organic quasi-one-dimensional ferromagnet F4BImNN

Phys. Rev. B American Physical Society 88:6 (2013) 064423-064423

Authors:

Stephen J Blundell, Johannes S Möller, Tom Lancaster, Peter J Baker, Francis L Pratt, Gonca Seber, Paul M Lahti
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