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Blundell, Stephen J.; Pattenden, P.A.; Pratt, F. L.; Chow, K. H.; Hayes, W.; Sugano, Tadashi

doi:10.1023/a:1012648431156

Cited by 15 publications

(11 citation statements)

References 13 publications

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“…At low temperatures the reduction in local field is in good agreement with a Bloch-T 3/2 law, indicative of three-dimensional spin waves [183]. In 3-quinolyl nitronyl nitroxide (3-QNNN), a reduced local field is observed at the muon site, which is consistent with a canted magnetic structure [180,184]. In para-pyridyl nitronyl nitroxide (p-PYNN), weak precession below 90 mK is observed, superimposed on a large background [182].…”

Section: Molecular Magnetsmentioning

confidence: 72%

“…The first material discovered was para-nitrophenyl nitronyl nitroxide (p-NPNN), which showed ferromagnetism up to T c = 0.65 K in one of its crystal phases [179], as a result of an unpaired spin associated with the two NO groups on each nitrile molecule. Muon experiments on this and other materials in the series began soon after the initial discovery [180,181,182,183,184,185].…”

Section: Molecular Magnetsmentioning

confidence: 99%

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Muon spin spectroscopy: magnetism, soft matter and the bridge between the two

Nuccio

Schulz

Drew

2014

J. Phys. D: Appl. Phys.

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The use of implanted muons to probe the spin dynamics and electronic excitations in a variety of magnetic and non-magnetic materials is reviewed and is split into three main sections, the first of which is an introduction to the historical context and background of the muon technique, which includes a basic introduction to the experimental method and underlying theoretical models. The second section is concerned with inorganic magnetic systems, starting with an overview of spin dynamics around critical points in ordered magnets. This is followed by an introduction to the early work on spin glasses, liquids and ices, which then continues onto the recent research in this area, including a discussion of some of the more controversial recent work on spin ices and magnetic monopoles. Information obtained by muons vital to two very important technological areas -magnetic semiconductors and next-generation energy materials -closes the discussion of inorganic magnetic materials. The final section is concerned with spin dynamics and magnetism in soft materials, and starts with discussing many of the key results in molecular magnets and organic spintronics. Spin dynamics in organic semiconductors, polymers and biological molecules is then covered, where contradictory experimental and theoretical work on charge carrier motion is presented. The similarities between the low-field relaxation rates in these "conducting" organic materials is compared to measurements of the electron spin relaxation measured in localised electronic states, obtained from high-field avoided level crossing spectroscopy in similar (and the same) materials.

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Section: Molecular Magnetsmentioning

confidence: 72%

Section: Molecular Magnetsmentioning

confidence: 99%

Muon spin spectroscopy: magnetism, soft matter and the bridge between the two

Nuccio

Schulz

Drew

2014

J. Phys. D: Appl. Phys.

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“…The reduced local field is consistent with a canted magnetic structure (Pratt et al . 1993;Blundell et al . 1997b).…”

Section: G (T)mentioning

confidence: 99%

Muon-spin-rotation studies of organic magnets

Blundell

1999

Philosophical Transactions of the Royal Society of London. Seri

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A muon is an unstable spin-1 2 particle with a lifetime of 2.2 µs. Beams of spinpolarized positive muons can be prepared at accelerator facilities and then subsequently implanted in various types of condensed matter. Both the time and direction dependence of the subsequent positron emission can be monitored. This allows the precession and relaxation of the average muon-spin polarization to be measured and the local magnetic field in the sample to be directly inferred. The muon thus behaves essentially as a 'microscopic magnetometer' and is used to follow the magnetic order at a local level and to investigate both static and dynamic effects. This article outlines the principles of various experimental techniques that involve implanted muons, and reviews some recent experimental data on organic and molecular magnets.

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“…Small chemical changes to the rest of the molecule lead to significant changes in crystal structure, thereby altering the intermolecular overlaps and thus the magnetic interactions between unpaired spins on neighboring molecules. Thus, different compounds have greatly different magnetic ground states and these can be effectively studied using ~tSR [5][6][7][8][9][10][11][12].…”

Section: Nitronyl Nitroxidesmentioning

confidence: 99%

“…The alternating chain possesses an energy gap between the singlet ground state and the lowest lying band of triplet excited states which closes up above Tsp. IxSR studies indicate a slowing down of the electronic fluctuations resulting from the opening of a gap in the magnetic excitation spectrum as the temperature is lowered below Tsp [22].…”

Section: Other Organic Magnetic Materialsmentioning

confidence: 99%

Muon studies of organic ferromagnets and conductors

Blundell

1997

Appl. Magn. Reson.

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Abstraet. Muon spin rotation (~tSR) experiments can be especially helpful in the study of various organic molecular materials. The technique has been used to study the magnetization in nitronyl nitroxide organic ferromagnets, the spin-density-wave ground state in various charge transfer salts, the dynamics of carriers in organic eonductors and the vortex structures in organic superconductors. I outline the motivation for studying these new materials and review and discuss the results of recent work.

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Cited by 15 publications

References 13 publications

Muon spin spectroscopy: magnetism, soft matter and the bridge between the two

Muon spin spectroscopy: magnetism, soft matter and the bridge between the two

Muon-spin-rotation studies of organic magnets

Muon studies of organic ferromagnets and conductors

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