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# Phase Diagram of $$\beta'$$-(BEDT-TTF)$$_2$$ICl$$_2$$ under High Pressure Based on the First-Principles Electronic Structure

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### Abstract

We present a theoretical study on the superconductivity of $$\beta'$$-(BEDT-TTF)$$_2$$ICl$$_2$$ at $$T_{\rm c}=$$14.2 K under a high hydrostatic pressure recently found, which is the highest among organic superconductors. In the present work, we study an effective model using the fluctuation-exchange (FLEX) approximation based on the results of first-principles calculation. In the obtained phase diagram, the superconductivity with $$d_{xy}$$-like symmetry is realized next to the antiferromagnetic phase, as a result of the one-dimensional to two-dimensional crossover driven by the pressure.

### Author and article information

###### Journal
19 November 2003
2003-11-20
10.1143/JPSJ.73.25
cond-mat/0311436