Dielectric Study of the Pressure Effect on the Phase Transitions in Deuterated Crystal [N(CD_3)_4]_2CuCl_4(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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Effect of hydrostatic pressure on the phase transitions in deuterated crystal [N(CD_3)_4]_2CuCl_4 have been studied by dielectric measurements. The pressure-temperature (p-T) phase diagram was obtained and compared with that of the hydrogen compound. By deuteration the boundary region between the atomspheric-pressure incommensurate phase (phase II : q < (l/3)/c^*_0) and the presssure-induced incommensurate phase (phase II' : q > (1/3)c^*_0) shifts toward lower pressure side. (q: the modulation wave vector, c^*_0 : the reciprocal unit cell vector in the normal phase) Deuteration shifts the pressureinduced ferroelectric phase to lower pressure by about 40 MPa. The result shows that the effect of deuteration on the phase stability in [N(CH_3)_4]_2CuCl_4 is equivalent to application of hydrostatic pressure. This deuteration effect is opposite tendency to that of other [N(CH_3)_4]_2XCl_4-type crystals.
社団法人日本物理学会の論文
2002-12-15