Magnetically ordered molecule-based materials

Miller, Joel S.

doi:10.1039/c0cs00166j

Cited by 367 publications

(250 citation statements)

References 263 publications

(168 reference statements)

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“…Ni(TCNQ-D4) 2 was synthesized in a similar manner to the protio-form, and the crystalline product formed was found to have a Curie temperature of T C ¼ 20 K. This transition temperature was 18% larger than that of the protioform synthesized in our laboratory. Muon spin relaxation measurements were performed in Zero Field (ZF) and in Longitudinal Fields (LF) of up to 0.45 T. The ZF data confirmed that the sample undergoes a bulk ferromagnetic transition at a temperature similar to that observed by the bulk magnetization data.…”

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confidence: 86%

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A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2

Berlie

Terry

Giblin

et al. 2013

Journal of Applied Physics

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

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confidence: 86%

“…A muon spin relaxation study of the metal-organic magnet Ni(TCNQ) 2 (Presented 15 January 2013; received 3 November 2012; accepted 3 January 2013; published online 3 April 2013)…”

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confidence: 99%

A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2

Berlie

Terry

Giblin

et al. 2013

Journal of Applied Physics

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“…One big advancement in metal-organic magnetism was reached with the synthesis of the M(TCNQ) 2 series, where M = Fe, Mn, Co, and Ni [13]. The hydrated or solvated product, M(TCNQ) 2 (S) x (where S = solvent), can be easily synthesized and shows paramagnetic behavior [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…For example, charge transfer systems have been used to create exotic magnets with the organic component acting as an exchange pathway between metal ions [1,2]. [Fe(Cp * ) 2 ][TCNE] (Cp * = C 5 Me 5 , pentamethylcyclopentadienide, TCNE = tetracyanoethylene) was one of the first charge transfer magnetic compounds to be synthesized where a T C of 2.55 K was observed [3,4].…”

Section: Introductionmentioning

confidence: 99%

Separating the ferromagnetic and glassy behavior within the metal-organic magnetNi(TCNQ)2

et al. 2015

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Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review B 92, 184431 c 2015 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. An in-depth study of the metal-organic magnet Ni(TCNQ) 2 was conducted where the deuterated form was synthesised both to attempt to alter the magnetic properties of the material and to be advantageous in techniques such as neutron scattering and muon spectroscopy. Deuteration saw a 3 K increase in T C with magnetization and heat capacity measurements demonstrating a spin wave contribution at low temperatures confirming the 3D nature of the ferromagnetic state shown by Ni(TCNQ − D 4 ) 2 . AC susceptibility results suggest there is a glassy component associated with the magnetically ordered state, though muon spectroscopy measurements did not support the presence of a spin glass state. Instead muon spectroscopy at zero magnetic field indicated the presence of two magnetic transitions, one at 20 K and another below 6 K; the latter is likely due to the system entering a quasistatic regime, similar to what one might expect of a superspin or cluster glass. Neutron diffraction measurements further supported this by revealing very weak magnetic Bragg peaks suggesting that the magnetism may have a short coherence length and be confined to small grains or clusters. The separation of the ferromagnetic and glassy magnetic components of the material's properties suggest that this system may show promise as a metal-organic magnet which is easily modified to change its magnetic properties, providing larger grain sizes can be synthesized.

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“…One area where there has been a wealth of research activity is organic magnetism, with much work conducted on charge transfer systems [4,5,6] although defect properties of these compounds have not received much attention. In order to focus specifically on the defect magnetism, a good strategy is to choose a system in which the background contribution is non-magnetic, which can be achieved by using a spin-Peierls (SP) system.…”

Section: Introductionmentioning

confidence: 99%

Magnetic ordering of defects in a molecular spin-Peierls system

Berlie¹,

Terry²,

Cottrell³

et al. 2016

J. Phys.: Condens. Matter

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With interest in charge transfer compounds growing steadily, it is important to understand all aspects of the underlying physics of these systems, including the properties of the defects and interfaces that are universally present in actual experimental systems. For the study of these defects and their interactions a spin-Peierls (SP) system provides a useful testing ground. This work presents an investigation within the SP phase of potassium TCNQF 4 where anomalous features are observed in both the magnetic susceptibility and ESR spectra for temperatures between 60 K and 100 K. Muon spin spectroscopy measurements confirm the presence of these anomalous magnetic features, with low temperature zero-field data exhibiting the damped oscillatory form that is a characteristic signature of static magnetic order. This ordering is most likely due to the interaction between structurally correlated magnetic defects in the system. The critical behaviour of the temperature dependent muon spin rotation frequency indicates that a 2D Ising model is applicable to the magnetic ordering of these defects. We show that these observations can be explained by a simple model in which the magnetic defects are located at stacking faults, which provide them with a 2D structural framework to constrain their interactions.

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Magnetically ordered molecule-based materials

Cited by 367 publications

References 263 publications

A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2

A muon spin relaxation study of the metal-organic magnet Ni(TCNQ)2

Separating the ferromagnetic and glassy behavior within the metal-organic magnetNi(TCNQ)2

Magnetic ordering of defects in a molecular spin-Peierls system

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