Cyclotron resonance in the quasi-1D organic superconductor (TMTSF)2ClO4

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We report the observation of cyclotron resonance (CR) in a metal possessing pure quasi-one-dimensional Fermiology - namely, the organic linear-chain compound (TMTSF)2ClO4, whose Fermi surface consists of a pair of weakly warped sheets. The CR phenomenon is related to weak inter-chain coupling, which allows electrons constrained on open trajectories to acquire small transverse velocities. Application of an appropriately oriented magnetic field induces periodic motion transverse to the chain direction and, hence, to a resonance in the AC conductivity. The field orientation dependence of the resonance is related simply to the Fermi velocity and lattice periodicity.