This work was supported in part by NSF Grant No. DMR-9623306 and the Petroleum Research Fund ACS-PRF 33812-AC. Work performed at the National High Magnetic Field Laboratory was supported by the NSF, the state of Florida, and the U.S. Department of Energy. Work at Argonne National laboratory was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences, under Contract No. W-31-109-ENG- 38. Work at Portland State University was supported by NSF Grant No. CHE-9632815 and the Petroleum Research Fund No. ACS-PRF 31099-AC1.
Physical Review B
Organic superconductors, Magnetoresistance
We report direct observations of anomalous magnetic-field and temperature dependences of the Shubnikov–de Haas oscillations in the organic superconductor β″-(BEDT-TTF)₂SF₅CH₂CF₂SO₃. Unlike other BEDT-TTF based organic superconductors, a nonmetallic temperature dependence of the background magnetoresistance is clearly observed. It is speculated that the nonmetallic behavior may arise from a partial nesting of the open orbits, similar to the field-induced density wave in the quasi-one-dimensional systems or a charge localization. The analysis of the magnetoresistance oscillations are found to deviate from the conventional Lifshitz-Kosevich description at high field and low temperatures. [S0163-1829(99)05433-8]
Zuo, F., Su, X., Zhang, P., Brooks, J. S., Wosnitza, J., Schlueter, J. A., Williams, Jack M., Nixon, P. G., Winter, R. W., Gard, G. L. (1999). Anomalous low-temperature and high-field magnetoresistance in the organic superconductor β″-(BEDT-TTF)₂SF₅CH₂CF₂SO₃. Physical Review B., 60 6296.