To provide a photoresponsive material that solves at least one of the problems of conventional technology. [Solution] The material has a crystalline structure formed by crosslinking at least one
lanthanide with an
organic group having 1 to 3 carbon atoms, wherein the
organic group contains at least carbon atoms which may be partially or entirely substituted with other nonmetallic
carbon group elements, and
oxygen atoms which may be partially or entirely substituted with other nonmetallic
oxygen group elements. A photoresponsive material having a peak component in the range of 533 eV to 534 eV in the O1s spectrum obtained by hard X-
ray photoelectron
spectroscopy.