Effect of magnetic impurities on superconductivity and spin correlation of La2-xSrxCuO4

T. Churei; H. Hiraka; Y. Endoh; M. Matsuda; K. Yamada

doi:10.1016/S0921-4534(03)00859-1

Effect of magnetic impurities on superconductivity and spin correlation of La_2-xSr_xCuO₄

T. Churei, H. Hiraka, Y. Endoh, M. Matsuda, K. Yamada

Research output: Contribution to journal › Conference article › peer-review

2 Scopus citations

Abstract

In order to investigate the effect of magnetic impurities systematically, the superconducting phase diagram is investigated by using a concentration-graded single crystal of La_2-xSr_xCu _0.97Ni_0.03O₄ with x between 0.10 and 0.20. The anomalous suppression of T_c seen in the impurity-free system at around x = 0.12, disappears upon 3% Ni-substitution and the bulk superconductivity is drastically depressed as well as T_c below x ∼ 0.12. In contrast to non-magnetic Zn-substitution no static spin correlation is observable in the 2% Ni-substituted La_1.85Sr _0.15Cu_0.98Ni_0.02O₄ (T_c = 28 K). On the other hand, well-defined incommensurate magnetic peaks appear down to ω = 0.4 meV. The correlation length evaluated from the inelastic peak-width is ∼50 Å, which is comparable to that of 1.2% Zn-substituted La_1.86Sr_0.14Cu_0.988Zn _0.012O₄ (∼70 Å).

Original language	English
Pages (from-to)	194-198
Number of pages	5
Journal	Physica C: Superconductivity and its Applications
Volume	392-396
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0921-4534(03)00859-1
State	Published - Oct 2003
Externally published	Yes
Event	Proceedings of the 15th International Symposium on Superconduc - Yokohama, Japan Duration: Nov 11 2002 → Nov 13 2002

Funding

We greatly acknowledge K. Hirota and M. Kofu for technical support for ICP measurements at Tohoku University and T. Uefuji for analysis of instrumental-resolution deconvolution of neutron scattering experiment. This work was supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology, Grant-in-Aid for Scientific Research on Priority Areas Contract, Scientific Research (A), Encouragement of Young Scientists, Creative Scientific Research, the Japan Science and Technology Corporation, the Core Research for Evolutional Science and Technology Project (CREST), and the National Science Foundation under agreement no. DMR-9986442.

Funders	Funder number
National Science Foundation	DMR-9986442
Japan Science and Technology Corporation
Ministry of Education, Culture, Sports, Science and Technology
Core Research for Evolutional Science and Technology

Keywords

Neutron scattering
Spin correlation
Sr concentration-graded single crystal
Superconducting phase diagram

Access to Document

10.1016/S0921-4534(03)00859-1

Cite this

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title = "Effect of magnetic impurities on superconductivity and spin correlation of La2-xSrxCuO4",

abstract = "In order to investigate the effect of magnetic impurities systematically, the superconducting phase diagram is investigated by using a concentration-graded single crystal of La2-xSrxCu 0.97Ni0.03O4 with x between 0.10 and 0.20. The anomalous suppression of Tc seen in the impurity-free system at around x = 0.12, disappears upon 3% Ni-substitution and the bulk superconductivity is drastically depressed as well as Tc below x ∼ 0.12. In contrast to non-magnetic Zn-substitution no static spin correlation is observable in the 2% Ni-substituted La1.85Sr 0.15Cu0.98Ni0.02O4 (Tc = 28 K). On the other hand, well-defined incommensurate magnetic peaks appear down to ω = 0.4 meV. The correlation length evaluated from the inelastic peak-width is ∼50 {\AA}, which is comparable to that of 1.2% Zn-substituted La1.86Sr0.14Cu0.988Zn 0.012O4 (∼70 {\AA}).",

keywords = "Neutron scattering, Spin correlation, Sr concentration-graded single crystal, Superconducting phase diagram",

author = "T. Churei and H. Hiraka and Y. Endoh and M. Matsuda and K. Yamada",

year = "2003",

month = oct,

doi = "10.1016/S0921-4534(03)00859-1",

language = "English",

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pages = "194--198",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

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TY - JOUR

T1 - Effect of magnetic impurities on superconductivity and spin correlation of La2-xSrxCuO4

AU - Churei, T.

AU - Hiraka, H.

AU - Endoh, Y.

AU - Matsuda, M.

AU - Yamada, K.

PY - 2003/10

Y1 - 2003/10

N2 - In order to investigate the effect of magnetic impurities systematically, the superconducting phase diagram is investigated by using a concentration-graded single crystal of La2-xSrxCu 0.97Ni0.03O4 with x between 0.10 and 0.20. The anomalous suppression of Tc seen in the impurity-free system at around x = 0.12, disappears upon 3% Ni-substitution and the bulk superconductivity is drastically depressed as well as Tc below x ∼ 0.12. In contrast to non-magnetic Zn-substitution no static spin correlation is observable in the 2% Ni-substituted La1.85Sr 0.15Cu0.98Ni0.02O4 (Tc = 28 K). On the other hand, well-defined incommensurate magnetic peaks appear down to ω = 0.4 meV. The correlation length evaluated from the inelastic peak-width is ∼50 Å, which is comparable to that of 1.2% Zn-substituted La1.86Sr0.14Cu0.988Zn 0.012O4 (∼70 Å).

AB - In order to investigate the effect of magnetic impurities systematically, the superconducting phase diagram is investigated by using a concentration-graded single crystal of La2-xSrxCu 0.97Ni0.03O4 with x between 0.10 and 0.20. The anomalous suppression of Tc seen in the impurity-free system at around x = 0.12, disappears upon 3% Ni-substitution and the bulk superconductivity is drastically depressed as well as Tc below x ∼ 0.12. In contrast to non-magnetic Zn-substitution no static spin correlation is observable in the 2% Ni-substituted La1.85Sr 0.15Cu0.98Ni0.02O4 (Tc = 28 K). On the other hand, well-defined incommensurate magnetic peaks appear down to ω = 0.4 meV. The correlation length evaluated from the inelastic peak-width is ∼50 Å, which is comparable to that of 1.2% Zn-substituted La1.86Sr0.14Cu0.988Zn 0.012O4 (∼70 Å).

KW - Neutron scattering

KW - Spin correlation

KW - Sr concentration-graded single crystal

KW - Superconducting phase diagram

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