Superconductivity induced by extremely high pressure in layered organics, β'-(BEDT-TTF)₂ICl₂

Abstract

An organic Mott insulator,-(BEDT-TTF) 2 ICl 2 , is metallized by application of extremely high pressure up to 9.0GPa. When the metallic state is stabilized, superconductivity with the highest transition-temperature (T c) among organic systems appears. The maximum T c that we observed was 14.2K(onset) at 8.2GPa. A magnetic-field effect on this superconductivity and normal-state properties are discussed in terms of comparison with other organic superconductors.

SINTESIS DAN KARAKTERISASI BAHAN ORGANIK SUPERKONDUKTOR β-(BEDT-TTF)2I3 DAN β’-(BEDT-TTF)2ICl2

“…Kelompok kristal (BEDT-TTF)2X memiliki suhu kritis yang cukup tinggi dan memiliki banyak variasi struktur kristalin [1]. Penelitian sebelumnya memperlihatkan bahwa kristal β-(BEDT-TTF)2I3 memiliki sifat superkonduktivitas pada suhu 1.5 K, sedangkan kristal β'-(BEDT-TTF)2ICl2 memiliki sifat superkonduktivitas pada suhu 14.2 K [2,3].…”

“…Eksperimen lanjutan kristal ini menemukan struktur spin mengalami fasa antiferromagnetik (T N ) ketika suhu 22 K [2]. Sifat superkonduktivitas pada kristal dengan anion ICl2¯ muncul ketika diberikan tekanan sekitar 9 GPa [3,5].…”

One Dimensional Organic Superconductors

“…, superconducting features were shown to appear above 70kbar with a critical temperature about 14.2K, nearly constant up to 90kbar while the high temperature insulating state disappears only above 82kbar [149]. In inorganic materials, such phase competition involving superconductivity has also been observed in a wide range of compounds such as 3 NbSe [150], heavy fermions [151,152,153,154] and cuprates [155].…”