section_path: Non-classical states/Crystals with some degree of disorder
section_name: Crystals with some degree of disorder
paragraph_text: Crystals with some degree of disorder
  
  A plastic crystal is a molecular solid with long-range positional order but with constituent molecules retaining rotational freedom; in an orientational glass this degree of freedom is frozen in a quenched disordered state.
  
  Similarly, in a spin glass magnetic disorder is frozen.