Muons and magnets

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Muon-fluorine entanglement in fluoropolymers

Journal of Physics Condensed Matter 21:34 (2009)

Authors:

T Lancaster, FL Pratt, SJ Blundell, I McKenzie, HE Assender

Abstract:

We present the results of muon spin relaxation measurements on the fluoropolymers polytetrafluoroethylene (PTFE), poly(vinylidene fluoride) (PVDF) and poly(vinyl fluoride) (PVF). Entanglement between the muon spin and the spins of the fluorine nuclei in the polymers allows us to identify the different muon stopping states that occur in each of these materials and provides a method of probing the local environment of the muon and the dynamics of the polymer chains. © 2009 IOP Publishing Ltd.
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Control via electron count of the competition between magnetism and superconductivity in cobalt and nickel doped NaFeAs

(2009)

Authors:

Dinah R Parker, Matthew JP Smith, Tom Lancaster, Andrew J Steele, Isabel Franke, Peter J Baker, Francis L Pratt, Michael J Pitcher, Stephen J Blundell, Simon J Clarke
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Local magnetism and magnetoelectric effect in HoMnO3 studied with muon-spin relaxation

(2009)

Authors:

HJ Lewtas, T Lancaster, PJ Baker, SJ Blundell, D Prabhakaran, FL Pratt
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Muon-fluorine entanglement in fluoropolymers.

J Phys Condens Matter 21:34 (2009) 346004

Authors:

T Lancaster, FL Pratt, SJ Blundell, I McKenzie, HE Assender

Abstract:

We present the results of muon spin relaxation measurements on the fluoropolymers polytetrafluoroethylene (PTFE), poly(vinylidene fluoride) (PVDF) and poly(vinyl fluoride) (PVF). Entanglement between the muon spin and the spins of the fluorine nuclei in the polymers allows us to identify the different muon stopping states that occur in each of these materials and provides a method of probing the local environment of the muon and the dynamics of the polymer chains.
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Spin freezing and dynamics in Ca3 Co2-x Mnx O6 (0.95) investigated with implanted muons: Disorder in the anisotropic next-nearest-neighbor Ising model

Physical Review B - Condensed Matter and Materials Physics 80:2 (2009)

Authors:

T Lancaster, SJ Blundell, PJ Baker, HJ Lewtas, W Hayes, FL Pratt, HT Yi, SW Cheong

Abstract:

We present a muon-spin relaxation investigation of the Ising chain magnet Ca3 Co2-x Mnx O6 (0.95). We find dynamic spin fluctuations persisting down to the lowest measured temperature of 1.6 K. The previously observed transition at around 18K is interpreted as a subtle change in dynamics for a minority of the spins coupling to the muon that we interpret as spins locking into clusters. The dynamics of this spin fraction freeze below a temperature TSF.
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