Proton irradiation defects in (fluoranthene)2PF6

Longitudinal and transverse diffusion of conduction-electron spins on stacks of fluoranthene radical cations

“…The reduction of l c with increasing defect concentration x in the metallic phase is undisputable, but comparing samples B and C the reduction factor of l c is smaller than that of ʈ or D ʈ , and especially smaller than the ratio of the defect concentrations x. This is in accordance with a recent analysis of proton spin lattice relaxation via the Overhauser shift technique that indicated a nonuniform distribution of the proton-irradiationinduced defects in sample C. 58 A relevant part of the defects ͑x͒ in this sample seems to reside on the crystal's surface, and has therefore only a minor influence on the conductionelectron spins characterized by the pulsed ESR experiment. A steeper decrease of l c ͑T͒ is observed below the structural phase transition, T Ͻ T S , and it is even more pronounced below the Peierls transition, T Ͻ T P .…”

“…It has been shown by Overhauser-shiftdetected proton spin lattice relaxation, however, that only some of the radiation defects interact with the conduction electrons in the FA stack. 58 Before being used for the diffusion coefficient measurements, all crystals were controlled for twinning or pronounced growth sectors by X-band continuous-wave ESR. In addition, except for the most perfect crystal ͑A͒, the microwave conductivity was measured parallel and perpendicular to the FA stacks at 10 GHz during slow cooling of the crystals ͑Fig.…”

Influence of proton irradiation on the magnetic properties of two-dimensional Ni(II) molecular magnet

“…An additional increase of the magnetization in the FC/ZFC curves observed at T = 2–6 K for all irradiated samples may arise from a small sample’s fraction, which due to the deformation and partial destruction of a lattice, leads to the creation of localized magnetic moments due to open bonds 47 or paramagnetic amorphous zones in the lattice 44 . This paramagnetic contribution may also cause the appearance of the observed step in the hysteresis loop near-zero field.…”