beta-YbAlB4, WORKING SUBSTANCE FOR MAGNETIC REFRIGERATION COMPRISING THE SAME, MANUFACTURING METHOD THEREOF, AND METHOD AND DEVICE OF MAGNETIC REFRIGERATION USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a working substance for magnetic refrigeration, and magnetic refrigeration method using the same, of which (i) heat conductivity is good at a very low temperature with high heat exchanging efficiency, (ii) a cooling reaching limit temperature is absolute zero or its vicinity, and (iii) no dilution with nonmagnetic ion is required.

SOLUTION: The magnetic refrigeration method uses β-YbAlB4having quantum critical nature under a normal pressure and the working substance for magnetic refrigeration having the quantum critical nature under a normal pressure. The method includes (a) a process in which the working substance for magnetic refrigeration is arranged in a magnetic field so that the working substance for magnetic refrigeration is spin-deflected under the magnetic field, and (b) a process in which the magnetic field is made zero thereafter so that the spin-deflection state is changed into such state that shows quantum critical nature while the working substance for magnetic refrigeration is cooled to the vicinity of absolute zero, thereby the temperature of the environment where the working substance for magnetic refrigeration is arranged is cooled to the vicinity of the absolute zero.

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