Critical behavior in the low-energy spin fluctuations in high-T-c superconductors
Panagopoulos, C., Tallon, J.L., Rainford, B.D., Xiang, T., Cooper, J.R. and Scott, C.A. (2002) Critical behavior in the low-energy spin fluctuations in high-T-c superconductors. Journal of Superconductivity, 15, (5), 335-338. (doi:10.1023/A:1021061911839).
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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 SR 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.
|Keywords:||spin dynamics, criticality, high-T c cuprates|
|Subjects:||Q Science > QC Physics|
|Divisions:||University Structure - Pre August 2011 > School of Physics and Astronomy
|Date Deposited:||14 Aug 2008|
|Last Modified:||16 Aug 2012 02:39|
|Contributors:||Panagopoulos, C. (Author)
Tallon, J.L. (Author)
Rainford, B.D. (Author)
Xiang, T. (Author)
Cooper, J.R. (Author)
Scott, C.A. (Author)
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