Specific Heat Jump in Metals under Quantizing Magnetic Fields

概要

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The specific heat is calctrlated for a three-dinaensional electron gas in metals under qtrantizingmagnetic fields taking into accotrnt magnetic interactions between condtrction electrons (theShoenberg effect). Under the conditions of the nonlinear de Haas-van Alphen (dHvA) effect thetemperature jump in specific heat at a diaznagnetic phase transition is calculated. The .juuaapoccurring at the magnetic field corresponding to the centre of the dHvA period is about of a fewpercent of the specific heat in the absence of rnagnetic field. In gold and copper it is predicted tobe larger than the maximal value of the change observed dtrring a.c. temperature rneasurementsin heat capacity of beryllium in a magnetic field. It is shown that the j LllT1p substantially increaseswith increasing magnetic field. Limiting fields for existence of diarnagnetic phase transitions atany temperature, as well as transition temperattrres in gold and copper at certain fields, areestimated and it is found that the latter coincide with the rneasured values.
社団法人日本物理学会の論文
1997-01-15