Magnetostriction and Thermal Expansion Measurements ofCuGeO3

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The magnetostriction and thermal expansion of CuGeO 3 have been measured in magnetic fields of up to 14 T using a capacitance method. An anomalous increase and hysteresis were observed in the magnetostriction at the transition between the spin-Peierls (SP) phase and the magnetic (M) phase, which show that the strain introduced at the transition from the uniform (U) phase to the SP phase is partially removed at the transition from the SP phase to the M phase.