Magnetotransport measurements on β"-(BEDT-TTF)4 [(H3 O)Ga3+(C2 O4 )3 ]. C6 H5 NO2
Synthetic Metals 137:1-3 (2003) 1313-1314
Abstract:
Transport measurements have been carried out on single crystals of the charge transfer salt β″-(BEDT-TTF)4[(H3O)Ga3+(C2 O4)3]. C6H5NO2, using magnetic fields of up to 33 T and temperatures down to 0.55 K. The material is found to be superconducting with Tc ≈ 7.5 K and an in-plane critical field Bc2 ≥ 33 T, and to exhibit Shubnikov-de Haas (SdH) oscillations. The temperature and angle dependence of the Shubnikov-de Haas oscillations and the upper critical field are reported, allowing information about the anisotropy of the upper critical field, effective mass m*, and the Fermi-surface (FS) of the material to be deduced.Millimetre-wave response of the novel organic superconductors beta ''-ET4[(H3O)M(C2O4)(3)]center dot S (M=Fe3+, S=C6H5CN and C6H5NO2)
SYNTHETIC MET 137:1-3 (2003) 1225-1226
Abstract:
The high frequency (f=70 GHz) magneto-optical response of beta"-ET4[(H3O)M(C2O4)(3)].S, where M=Fe3+, S=C6H5CN and C6H5NO2, has been investigated in the temperature range 1.4 K < T < 120 K. The angle dependence of the EPR spectra and the anisotropy of the g-factors for the two materials are presented.Millimetre-wave response of the novel organic superconductors β″-ET4 [(H3 O)M(C2 O4 )3 ].S (M=Fe3+, S= C6 H5 CN and C6 H5 NO2 )
Synthetic Metals 137:1-3 (2003) 1225-1226
Abstract:
The millimeter-wave response of the novel organic superconductors was studied. The magneto-optical response of the two samples containing Fe3+ ions and the host solvents benzonitrile and nitrobenzene. The angle dependence of the electron paramagnetic resonance (EPR) spectra and the anisotropy of the g-factors for the two materials were presented. The angle of dependence of the absorption spectra at 1.4 K for the two samples were compared.A mu SR study of the spin dynamics in Ir-diluted layered manganites
PHYSICA B 326:1-4 (2003) 513-517
Abstract:
Dilution on the B-site with Ir or Rh can lead to the enhancement of ferromagnetic couplings in layered manganites. We report a muSR study of the spin dynamics of the layered manganites La0.25Sr1.75MnpIr1-pO4 (p = 0.5, 0.75) as a function of the dilution. We have characterized the static magnetic behavior using SQUID magnetic measurements and used muon spin relaxation spectroscopy to provide evidence for short-range ferromagnetic correlations. Furthermore, the effect of dilution on the critical dynamics in this two-dimensional spin system is reported and related to the dynamics above and below the critical percolation threshold. (C) 2002 Elsevier Science B.V. All rights reserved.Changes of the spin dynamics in perovskite and bilayer manganite
PHYSICA B 326:1-4 (2003) 500-504