The intermediate state of the spin-peierls system TTF-AuBDT: A magnetic and specific heat study

• Published in: Physica B + C Vol. 145; no. 3; pp. 299 - 310
• Main Authors: Korving, W.H., Kramer, G.J., Steeman, R.A., Brom, H.B., De Jongh, L.J., Fujita, M., Machida, K.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.1987; North-Holland
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron states; Exact sciences and technology; Metal-insulator transitions and other electronic transitions; Physics; Mean field approximation; Temperature; Magnetization; Gold Complexes; Transition metal Compounds; Organic ligand; Theoretical study; Very low temperature; Experimental study; Inorganic compound; Magnetic susceptibility; Specific heat; Sulfur heterocycle; Organic conductor; Spin Peierls transition; Incommensurate phase; Magnetic field; Organic compounds
• ISSN: 0378-4363
• DOI: 10.1016/0378-4363(87)90097-0

We report measurements of the differential susceptibility, magnetization and specific heat on the field dependent spin-Peierls transition in tetrathiafulvalene-gold-bisdithiolene (TTF-AuBDT). Temperature-, field- and frequency ranges are extended in comparison with previous studies. The data confirm the incommensurate nature of the high field, low temperature phase in spin-Peierls systems. Theoretical calculations, based on the mean-field Pytte Hamiltonian and using the soliton lattice solution for the incommensurate state prove to be in satisfactory agreement with the experiments. In the incommensurate state relaxation times, asociated with the formation of discommensurations are found to be in the order of seconds.