  Sintered samples of a spinel oxide LiFeCr4O8, where Cr3+ and Fe3+ ions have
localized moments, were found to show a large magnetic-field-induced volume
increase approaching 500 ppm by applying a magnetic field of 9 T. This large
volume increase appeared only at around 30 K. At 30 K, a spin-reorientation
transition from ferrimagnetic to conical order occurs, giving rise to this
large volume increase. The coexistence of ferrimagnetic and conical phases at
this transition was found to be important, suggesting that such a large
magnetic-field-induced volume change can be realized at various magnetic
transitions in localized magnets with strong spin-lattice coupling.
