|
|||||
|
|
A stable superconducting state at 8 K and ambient pressure in\alpha _t - (BEDT - TTF^ \star )_2 I_3 ^1 |
|
| Authors: | D Schweitzer P Bele H Brunner E Gogu U Haeberlen I Hennig I Klutz R Świetlik H J Keller |
| Institution: | 1. 3. Physikalisches Institut der Universit?t, Pfaffenwaldring 57, D-7000, Stuttgart, Federal Republic of Germany 2. Abteilung Molekulare Physik, MPI für Medizinische Forschung, Jahnstrasse 29, D-6900, Heidelberg, Federal Republic of Germany 4. Anorganisch-chemisches Institut der Universit?t Heidelberg, Im Neuenheimer Feld, D-6900, Heidelberg, Federal Republic of Germany |
| Abstract: | We report bulk superconductivity at 8 K and ambient pressure in crystals of α t (BEDT-TTF)2I3. In contrast to the earlier observed metastable superconducting state at 8 K in crystals of β-(BEDT-TTF)2I3 here the superconducting state is stable and the crystals can be prepared by tempering α-(BEDT-TTF)2I3 above 70 °C for several days. ac-susceptibility measurements show that the observed superconducting state at 8 K is a bulk property of the crystals. Resistivity measurements indicate a sharp superconducting transition at 8 K with an onset temperature of about 9 K. The upper critical fields Hc2 at 1.3 K lie between 3 and 11 T depending on the direction of the magnetic field with respect to the crystal axes. ESR- as well as NMR-measurements indicate a total transformation of the α-phase crystals into the new superconducting α t -crystals after tempering. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |