Cu spin dynamics in the overdoped regime of ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{Cu}}_{1\ensuremath{-}y}{\mathrm{Zn}}_{y}{\mathrm{O}}_{4}$ probed by muon spin relaxation

Cu spin dynamics in the overdoped regime of ${La}_{2 - x} {Sr}_{x} {Cu}_{1 - y} {Zn}_{y} O_{4}$ probed by muon spin relaxation

Risdiana, T. Adachi, N. Oki, S. Yairi, Y. Tanabe, K. Omori, Y. Koike, T. Suzuki, I. Watanabe, A. Koda, and W. Higemoto

Phys. Rev. B 77, 054516 – Published 26 February 2008

Abstract

Muon-spin-relaxation measurements have been performed for partially Zn-substituted ${La}_{2 - x} {Sr}_{x} {Cu}_{1 - y} {Zn}_{y} O_{4}$ with $y = 0 - 0.10$ in the overdoped regime up to $x = 0.30$ . In the 3% Zn-substituted samples up to $x = 0.27$ , exponential-like depolarization of muon spins has been observed at low temperatures, indicating a Zn-induced slowing down of the Cu spin fluctuations. The depolarization rate decreases with increasing $x$ , and almost no fast depolarization of muon spins has been observed for $x = 0.30$ where superconductivity disappears. The present results suggest that there is no quantum critical point at $x \sim 0.19$ . These results are discussed in terms of the stripe-pinning model and the phase-separation model.

Received 18 February 2007

DOI:https://doi.org/10.1103/PhysRevB.77.054516

Authors & Affiliations

Risdiana^*, T. Adachi^†, N. Oki, S. Yairi, Y. Tanabe, K. Omori, and Y. Koike

Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan

T. Suzuki and I. Watanabe

Advanced Meson Science Laboratory, RIKEN Nishina Center, 2-1 Hirosawa, Wako 351-0198, Japan

A. Koda

Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK-IMSS), 1-1 Oho, Tsukuba 305-0801, Japan

W. Higemoto

Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), 2-4 Shirane, Shirakata, Tokai, Naka, Ibaraki 319-1195, Japan

^*Present address: Department of Physics, Faculty of Mathematics and Natural Sciences, Padjadjaran University, Jl. Raya Bandung-Sumedang Km. 21 Jatinangor, West Jawa, Indonesia 45363.
^†Corresponding author: adachi@teion.apph.tohoku.ac.jp

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Vol. 77, Iss. 5 — 1 February 2008

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Physical Review B

covering condensed matter and materials physics

Cu spin dynamics in the overdoped regime of ${La}_{2 - x} {Sr}_{x} {Cu}_{1 - y} {Zn}_{y} O_{4}$ probed by muon spin relaxation

Risdiana, T. Adachi, N. Oki, S. Yairi, Y. Tanabe, K. Omori, Y. Koike, T. Suzuki, I. Watanabe, A. Koda, and W. Higemoto

Phys. Rev. B 77, 054516 – Published 26 February 2008

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Physical Review B

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Cu spin dynamics in the overdoped regime of La2−xSrxCu1−yZnyO4 probed by muon spin relaxation

Risdiana, T. Adachi, N. Oki, S. Yairi, Y. Tanabe, K. Omori, Y. Koike, T. Suzuki, I. Watanabe, A. Koda, and W. Higemoto

Phys. Rev. B 77, 054516 – Published 26 February 2008

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Cu spin dynamics in the overdoped regime of ${La}_{2 - x} {Sr}_{x} {Cu}_{1 - y} {Zn}_{y} O_{4}$ probed by muon spin relaxation