Thermal Properties at the Commensurate-Incommensurate Transition of K_2ZnCl_4

概要

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Tlae heart capacity of the K2ZI1Cl..1 single crystal W21,S uaaeasured betxveen 330 K and 415 K usingan adiabatic caloritaueter. A distinct anottaaly of' the cotaanaenstrrate-inconauaaenstrrate transitionxvas ol.cserx'ed at 403.64 .i 0.05 K f'or the first tiuaae by the adiabattic calorinnetry, where tlaeentlaalpy change is AH : 9.99OJ?ll10l ' ?rnd the enatropy change is A.5' : 0.025 J?K '?mol '.The anonaaly of the heat capacity is deunonstrated by the behavior of' the phase soliton or thedounain xvall near the transition point. The heat capacity xvas siuntrlated ntrmer'icallyr by using thephenonaeno1ogic?t1 Landatr theory and conaapared xvith the experiuaaental restrlts. The anotnaly ofthe thertaaal expansion near Tcz naeststrred by TNIA is related with a strtrcttrral phase transitionaccoraapanied by tlae entropy chatage. We disctrss the infltrence of the anouaaalous ch?rnge of' thetherrnal expansion cotnpared with the he?rt capacity near 'Z'C.
社団法人日本物理学会の論文
1998-10-15