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Journal of Low Temperature Physics

, Volume 142, Issue 3–4, pp 585–588 | Cite as

A Spin Resonance Investigation of Magnetism and Dynamics in the Charge-transfer Salts β"-(BEDT-TTF)4[(H3O)M(C2O4)3]S

  • Alessandro Narduzzo
  • Amalia Coldea
  • Arzhang Ardavan
  • John Singleton
  • Luca Pardi
  • Vasile Bercu
  • Akane Akutsu-Sato
  • Hiroki Akutsu
  • Scott Turner
  • Peter Day
Article
  • 29 Downloads

We report a spin resonance study of the family of quasi-two-dimensional organic (super)conductors β”-(BEDT-TTF)4[(H3O)M(C2O4)3]S, where M is a 3d transition metal ion and S is a host solvent molecule. The spin systems for M = Cr3+ (S = 3/2) and M = Fe3+ (S = 5/2) are investigated by means of both resonant and field modulation techniques in the frequency range between 50 and 313 GHz. The role of the different solvent molecules in determining the degree of spin-orbit coupling and the local symmetry at the metal ion site is established. The low temperature behaviour of intensities, positions and widths of the resonant lines shows significant modifications of the spin-orbit coupling, and of the inter-and intra-ionic spin-spin inter actions. Despite the onset of a weak antiferromagnetic internal field at low temperature, the ultimate narrowing of the lines suggests spin-lattice interactions may still be the dominant relaxation process. Diamagnetic screening in the mixed state of the superconducting samples for fields parallel to the quasi-two-dimensional layers induces additional lineshifts only below B = 2.5T and T = 4K, determining the threshold of full field penetration within the anion layers.

PACS Numbers

74.70-b 75.30.Cr 75.30.Et 76.30.-v 

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References

  1. 1.
    See for instance: P. Day et al., J. Am. Chem. Soc. 114, 10722 (1992) and references therein.Google Scholar
  2. 2.
    Coronado E. et al. (2000) . Nature 39408: 447CrossRefADSGoogle Scholar
  3. 3.
    Kurmoo et al. (1995) . J. Am. Chem. Soc. 117: 12209CrossRefGoogle Scholar
  4. 4.
    Martin L. et al. (2001) . Inorg. Chem. 40: 1363CrossRefGoogle Scholar
  5. 5.
    Uji S. et al. (2001) . Nature 410: 908CrossRefADSGoogle Scholar
  6. 6.
    A. Narduzzo et al., Synth. Met. 137 (1-3), 1225 (2003), A. Narduzzo et al., J. Phys. IV 114, 347 (2004).Google Scholar

Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • Alessandro Narduzzo
    • 1
  • Amalia Coldea
    • 1
  • Arzhang Ardavan
    • 1
  • John Singleton
    • 2
  • Luca Pardi
    • 3
  • Vasile Bercu
    • 3
  • Akane Akutsu-Sato
    • 4
  • Hiroki Akutsu
    • 5
  • Scott Turner
    • 6
  • Peter Day
    • 6
  1. 1.Clarendon LaboratoryUniversity of OxfordOxfordUK
  2. 2.NHMFLLos Alamos National LaboratoryLos AlamosUSA
  3. 3.Istituto per i Processi Chimico-Fisici, CNRPisaItaly
  4. 4.Research Centre for Spectrochemistry, Graduate School of ScienceThe University of TokyoTokyoJapan
  5. 5.Department of Material Science, Graduate School and Faculty of ScienceHimeji Institute of TechnologyHyogoJapan
  6. 6.Davy-Faraday Research LaboratoryThe Royal InstitutionLondonUK

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