A Spin Resonance Investigation of Magnetism and Dynamics in the Charge-transfer Salts β"-(BEDT-TTF)4[(H3O)M(C2O4)3]S |
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| Authors: | Alessandro Narduzzo Amalia Coldea Arzhang Ardavan John Singleton Luca Pardi Vasile Bercu Akane Akutsu-Sato Hiroki Akutsu Scott Turner Peter Day |
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| Affiliation: | (1) Clarendon Laboratory, University of Oxford, Oxford, OX1 3PU, UK;(2) NHMFL, Los Alamos National Laboratory, TA-35 Los Alamos, USA;(3) Istituto per i Processi Chimico-Fisici, CNR, 56124 Pisa, Italy;(4) Research Centre for Spectrochemistry, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;(5) Department of Material Science, Graduate School and Faculty of Science, Himeji Institute of Technology, Hyogo 678-1297, Japan;(6) Davy-Faraday Research Laboratory, The Royal Institution, London, UK |
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| Abstract: | 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. |
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