Abstract
The (BEDT)2X family of layered superconductors is one of the largest among nearly 50 organic superconductors currently known. One of the advantages of the organic compounds as prototype materials for studying the mechanisms of superconductivity is their relatively high sensitivity to hydrostatic pressure. We review recent NMR studies of these compounds using NMR under liquid and gas pressure. We focus on the low temperature part of the phase diagram where the physics is controlled by electronic correlations leading to a competition between magnetism and superconductivity. This interplay between different ground states is shown by the observation of a pseudo-gap and antiferromagnetic fluctuations and can be finely tuned by the application of pressure. Using a gas pressure system gives the unique possibility of sweeping the pressure at low temperature. Recently we used this technique to study the AF-SC boundary and established the existence of a first order transition line between the superconducting and antiferromagnetic states.
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References
R.H. McKenzie, Science 278 (1997) 820.
T. Ishiguro and K. Yamaji, Organic Superconductors (Springer, Berlin, 1990).
M. Lang, Habilitationsschrift, Darmstadt (1996).
J. Williams, Science 252 (1991) 1501.
P. Wzietek, H. Mayaffre, D. Jerome and S. Brazovskii, J. Phys. I (France) 6 (1996) 2011.
H. Mayaffre, Ph.D. thesis, Université Paris XI (1996).
U. Welp, S. Fleshler, W. Kwok, G. Crabtree, K. Carlson, J. Williams and V. Hitsman, Phys. Rev. Lett. 69 (1992) 840.
K. Miyagawa, A. Kawamoto, Y. Nakazawa and K. Kanoda, Phys. Rev. Lett. 75 (1995) 1174.
A. Kawamoto, K. Miyagawa, Y. Nakazawa and K. Kanoda, Phys. Rev. B 52 (1995) 15522.
K. Kanoda, Phys. C 282-287 (1997) 299.
H. Mayaffre, P. Wzietek, C. Lenoir, D. Jérome and P. Batail, Phys. Rev. Lett. 75 (1995) 4122.
D. Jerome, Science 252 (1991) 1509.
P. Wzietek, F. Creuzet, C. Bourbonnais, D. Jérome, K. Bechgaard and P. Batail, J. Phys. I 3 (1993) 171.
C. Bourbonnais, J. Phys. I (France) 3 (1993) 143.
C. Bourbonnais, in: Low Dimensional Conductors and Superconductors, eds. D. Jérome and L. Caron, Proc. of the NATO Advanced Study Institute (Plenum, New York, 1987) p. 155.
V. Kataev, G. Winkel, D. Khomskii, D. Wohlleben, W. Crump, K. Tebbe and J. Hahn, Solid State Com. 83 (1992) 435.
A. Kampf and J. Schrieffer, Phys. Rev. B 41 (1990) 6399.
S. Charfi-Kaddour, R. Tarento and M. Heritier, J. Phys. I (France) 2 (1992) 1853.
Y. Sushko, V. Bondarenko, R. Petrosov, N. Kushch and E. Yagubskii, J. Phys. I 1 (1991) 1375.
T. Timusk and B. Statt, Rep. Progr. Phys. 62 (1999) 61.
D. Zanchi-D and H. Schulz, Europhys. Lett. 44 (1998) 235.
H. Mayaffre, P. Wzietek, D. Jérome, C. Lenoir and P. Batail, Europhys. Lett. 28 (1994) 205.
P. Benard, L. Chen and A.-M. Tremblay, Phys. Rev. B 7 (1993) 15217.
H. Tanigushi, A. Kawamoto and K. Kanoda, Phys. Rev. B 59 (1999) 8424.
S. Lefebvre et al., to be published.
C. Niedermeyer, C. Bernhard, T. Blasius, A. Golnik, A. Moodenbaugh and J. Budnick, Phys. Rev. Lett. 80 (1998) 3843.
M. Julien, F. Borsa, P. Caretta, M. Horvati?, C. Berthier and C. Lin, Phys. Rev. Lett. 83 (1999) 604.
L.P. Pryadko et al., Cond-mat/9905146.
S. Kivelson and V.J. Emery, in: The Los Alamos Symposium-1993: Strongly Correlated Electronic Materials, eds. K.S. Bedell et al. (Addison-Wesley, Reading, MA, 1994) p. 619.
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Wzietek, P., Lefebvre, S., Mayaffre, H. et al. Two-dimensional organic superconductors studied by NMR under pressure. Hyperfine Interactions 128, 183–191 (2000). https://doi.org/10.1023/A:1012683632220
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DOI: https://doi.org/10.1023/A:1012683632220