Reciprocation characteristics of a magnet levitated above a YBa2Cu3Ox superconductor

We measured and analyzed the reciprocating motion of a magnet floated above a YBa2Cu3Ox superconductor. Frequency dependences of the amplitude and pha se of the reciprocation implied that the reciprocating motion has one degre e of freedom. A mechanical model with a mass, a spring, and a dashpot was u sed to analyze the reciprocation characteristics. By adding frequency and d isplacement dependences of the pinning effect to the mechanical model, we o btained good agreement between analytical and experimental results.