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, Masato Murakami, H. Yamagata, M. Matsumura

Research output: Contribution to journalArticle

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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
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number18
DOIs
Publication statusPublished - 2004 May
Externally publishedYes

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Nuclear quadrupole resonance
Spin fluctuations
nuclear quadrupole resonance
Spin-lattice relaxation
spin-lattice relaxation
nuclear spin
Relaxation time
relaxation time
Impurities
Spin dynamics
impurities
smear
spin dynamics
electron spin
Superconducting materials
moments
Electrons
curves

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Pseudo-spin-gap and slow spin fluctuation in La2-xSr xCuO4 (x=0.13 and 0.18) via 63Cu and 139La nuclear quadrupole resonance. / Itoh, Y.; Machi, T.; Koshizuka, N.; Murakami, Masato; Yamagata, H.; Matsumura, M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 69, No. 18, 184503, 05.2004.

Research output: Contribution to journalArticle

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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.",
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T1 - Pseudo-spin-gap and slow spin fluctuation in La2-xSr xCuO4 (x=0.13 and 0.18) via 63Cu and 139La nuclear quadrupole resonance

AU - Itoh, Y.

AU - Machi, T.

AU - Koshizuka, N.

AU - Murakami, Masato

AU - Yamagata, H.

AU - Matsumura, M.

PY - 2004/5

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N2 - 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.

AB - 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.

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