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Tl-NMR Study on High–Tc Oxides TlM2CaCu2O7–δ(M=Ba, Sr) : Spin-Gap in Underdoped and Overdoped Systems

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Abstract

The Spin–lattice relaxation rate \(T_1^{ - 1} \) and the Knight shift have been measured for Tl–based cuprates TlBa 2 CaCu 2 O 7+δ (TB1212) and TlSr 2 Y l−x Ca x Cu 2 O 7+δ (TS1212). In the underdoped sample of TS1212 with Tc=34K. (T 1 ) −1 showed a gap–like behavior from the temperature T SG=120K. As for the slightly overdoped sample of TB1212 with T c =80K, both the Knight shift and (T 1 ) −1 showed a significant decrease from 160K, suggesting the existing of the spin-gap not only around q≃(π, π) but also q≃0.

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Authors and Affiliations

  1. Faculty of Science and Technology, Sophia University, Tokyo, 102-8554, Japan

    Takayuki Goto

  2. Department of Chemistry. Graduate School of Science, Tohoku Univ, Japan

    Satoru Nakajima

  3. Inst. Mater. Res., Tohoku Univ, 9980-8577, Japan

    Takayuki Goto, E. Ohshima, Masae Kikuchi, Yasuhiko Syono & Tetsuo Fukase

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  1. Takayuki Goto
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  2. Satoru Nakajima
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  3. E. Ohshima
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  4. Masae Kikuchi
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  5. Yasuhiko Syono
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  6. Tetsuo Fukase
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Goto, T., Nakajima, S., Ohshima, E. et al. Tl-NMR Study on High–Tc Oxides TlM2CaCu2O7–δ(M=Ba, Sr) : Spin-Gap in Underdoped and Overdoped Systems. Journal of Low Temperature Physics 117, 467–471 (1999). https://doi.org/10.1023/A:1022554608179

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