Spatially inhomogeneous spin fluctuations in RuSr2EuCeCu2O10+δ -: art. no. 014515

초록

We report the results of a Cu nuclear quadrupole resonance (NQR) study on a very underdoped cuprate RuSr2EuCeCu2O10+delta, with a hole concentration in the CuO2 planes that is close to that where the onset of superconductivity is observed in the high-temperature superconducting cuprates (HTSC's). We find that the antiferromagnetic spin-fluctuation spectrum, as probed by the Cu spin-lattice relaxation rate, is similar to that observed in the HTSC's. Furthermore, the Cu spin-lattice relaxation rate and the Cu spin-spin relaxation rate are found to vary with frequency. By comparison with the HTSC La2-xSrxCuO4, we attribute the frequency variation to inhomogeneous spin fluctuations in the CuO2 planes.

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