Relaxor-like Behavior in .LAMBDA.-(BETS)2FeCl4 Studied by SR X-ray Diffraction
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We performed precise X-ray diffraction measurements on an organic conductor, λ-(BETS)<SUB>2</SUB>FeCl<SUB>4</SUB>, with synchrotron radiation, where BETS is bis(ethylendithio)tetraselenafulvalene. Around 70 K (=<I>T</I><SUB>FM</SUB>), the width of the Bragg reflection increased, and its peak was split into two with decreasing temperature. The direction of splitting was 0.017<B><I>a</I></B><SUP>*</SUP>−0.010<B><I>b</I></B><SUP>*</SUP>+0.002<B><I>c</I></B><SUP>*</SUP> in the reciprocal space. At 8.3 K (=<I>T</I><SUB>MI</SUB>), the discontinuous change in <I>c</I><SUP>*</SUP> was observed, and the peak of the Bragg reflection became single again, but remained broad. In the temperature region of <I>T</I><SUB>FM</SUB>><I>T</I>><I>T</I><SUB>MI</SUB>, it is considered that the system has a heterogeneous structure, and the coexistence of the high- and low-temperature phases below <I>T</I><SUB>FM</SUB> is presumably related to the anomalous behavior of dielectric constant in the metallic phase. The size of regions/domains was estimated to be about 0.4 μm.
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