Pseudo-spin-gap and slow spin fluctuation in La2-xSr xCuO4 (x=0.13 and 0.18) via 63Cu and 139La nuclear quadrupole resonance

Y. Itoh, T. Machi, N. Koshizuka, M. Murakami, H. Yamagata, M. Matsumura

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14 Citations (Scopus)

Abstract

We analyzed nonexponential 63Cu nuclear spin-lattice relaxation curves for 63Cu-enriched high-Tc superconductors: La 2-xSrxCuO4 with x=0.13 (slightly underdoped) and 0.18 (slightly overdoped), and studied the applicability of an impurity-induced nuclear spin-lattice relaxation theory. We found a remnant of pseudo-spin-gap effect on the host 63Cu nuclear spin-lattice relaxation time and slow inhomogeneous spin fluctuation via the impurity-induced relaxation time. The effect of slow spin dynamics was also observed in 139La nuclear spin-lattice relaxation. The inhomogeneous electron-spin fluctuation, which is associated with randomly distributed staggered moments on the CuO2 plane, smears the pseudo-spin-gap. The fact that the optimal Tc ∼38 K is smaller than T c∼96 K of HgBa2CuO4+δ can be attributed to the depairing effect due to the slow spin fluctuation.

Original languageEnglish
Article number184503
Pages (from-to)184503-1-184503-8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number18
DOIs
Publication statusPublished - 2004 May 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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