Synchrotron X-ray Diffraction Studies of the Incommensurate Phase of a Spin–Peierls System CuGeO<sub>3</sub>in Strong Magnetic Fields

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  • Synchrotron X-ray Diffraction Studies of the Incommensurate Phase of a Spin-Peierls System CuGeO3 in Strong Magnetic Fields

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Synchrotron X-ray diffraction measurements on a spin–Peierls material CuGeO3 in applied magnetic fields, H, up to 15 T are made. We find that the temperature, T, dependence of the incommensurate Bragg peak at a lower H is quite different from that at a higher H. At sufficiently high fields, we find that the lattice incommensurability, δl, is almost independent of T, while at H slightly above the critical field = 12.25 T for the commensurate to incommensurate transition, δl decreases with increasing T. We interpret that this finding is due to a stabilization of the incommensurate state by a strong magnetic field which suppresses thermal fluctuations.

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