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Critical Behavior in the Low-Energy Spin Fluctuations in High-Tc Superconductors |
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| Authors: | C. Panagopoulos J. L. Tallon B. D. Rainford T. Xiang J. R. Cooper C. A. Scott |
| Affiliation: | (1) Cavendish Laboratory and Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Cambridge, CB3 0HE, United Kingdom;(2) New Zealand Institute for Industrial Research, P.O. Box 31310, Lower Hutt, New Zealand;(3) Department of Physics and Astronomy, Southampton, United Kingdom;(4) Institute of Theoretical Physics, Academia Sinica, P.O. Box 2735, 100080 Beijing, People's Republic of China |
| Abstract: | We study the spin fluctuations of pure and Zn-substituted La2 – xSrxCuO4 using the muon spin relaxation technique. Superconductivity is found to coexist with low-frequency spin fluctuations over a large region of the superconducting phase diagram. The characteristic temperature of spin fluctuations detected by  SR decreases with increasing x and vanishes above a critical doping xc  0.19. This value of xc coincides with the doping at which the normal state pseudogap extrapolates to zero. These results are discussed in terms of a quantum transition that separates the superconducting phase diagram of high-temperature superconductors into two distinct ground states. |
| Keywords: | spin dynamics criticality high-Tc cuprates |
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