Abstract
We study the spin fluctuations of pure and Zn-substituted La2 − x Sr x CuO4 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 μSR decreases with increasing x and vanishes above a critical doping x c ≈ 0.19. This value of x c 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.
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Panagopoulos, C., Tallon, J.L., Rainford, B.D. et al. Critical Behavior in the Low-Energy Spin Fluctuations in High-T c Superconductors. Journal of Superconductivity 15, 335–338 (2002). https://doi.org/10.1023/A:1021061911839
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DOI: https://doi.org/10.1023/A:1021061911839