Abstract
The system Fe1+xCr2−xO4(0≤x≤0.4), in which a cooperative Jahn–Teller transition and a magnetic transition take place in the same temperature range, has been investigated by x-ray, magnetization, Mössbauer effect, and specific heat measurements. When 0.00≤x≤0.25, the Jahn–Teller transition temperature TD is higher than that of the magnetic transition TN, two peaks being observed in the specific heat. When x increases TD decreases slightly, whereas TN increases steeply, so that they coincide at x=0.275 with TD=TN=130 K, exhibiting a very sharp lambda type heat anomaly. When x>0.30, TD is expected to be lower than TN, but no distinct heat anomaly was observed in the expected temperature range. This indicates that the two cooperative phase transitions can couple when the higher temperature transition introduces a crucial part of the entropy lowering which would be expected after the lower temperature transition.
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