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We study the effect of temperature up to 1000K on the structure of densemolecular para-hydrogen and ortho-deuterium, using the path-integral MonteCarlo method. We find a structural phase transition from orientationallydisordered hexagonal close packed (hcp) to an orthorhombic structure of Cmcasymmetry before melting. The transition is basically induced by thermalfluctuations, but quantum fluctuations of protons (deuterons) are important indetermining the transition temperature through effectively hardening theintermolecular interaction. We estimate the phase line between hcp and Cmcaphases as well as the melting line of the Cmca solid.Comment: 8 pages, 7 figures; accepted in Phys. Rev.

Structural phase transition at high temperatures in solid molecular hydrogen and deuterium