Effect of magnetic impurities on spin fluctuations in La 2-xSrxCuO4

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

doi:10.1016/j.physc.2004.03.127

Effect of magnetic impurities on spin fluctuations in La _2-xSr_xCuO₄

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

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

1 Scopus citations

Abstract

Neutron scattering experiments for La_1.85Sr _0.15Cu_0.98Ni_0.02O₄ (T_c=28 K) demonstrated that well-defined incommensurate peaks appear in the superconducting state, giving an enhancement of χ″(q _IC,ω) at ∼1 meV associated with a sharpening of peak width. Thus, the Ni impurities induce low-energy excitations and smear the sharp edge structure in χ″(q_IC,ω) reported from the Ni-free system. On the other hand, no clear signature of magnetic ordering was observed in the elastic channel even at the lowest temperature. We conjecture that spin fluctuations around Ni impurities never quench but gradually slow down over a wide space, in contrast to Zn doping which locally destroys superconductivity in a drastic manner.

Original language	English
Pages (from-to)	775-777
Number of pages	3
Journal	Physica C: Superconductivity and its Applications
Volume	408-410
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physc.2004.03.127
State	Published - Aug 2004
Externally published	Yes
Event	Proceedings of the International Conference on Materials - Rio de Janeiro, Brazil Duration: May 25 2003 → May 30 2003

Keywords

LaSrCuO
Neutron scattering
Ni substitution
Spin fluctuations

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10.1016/j.physc.2004.03.127

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title = "Effect of magnetic impurities on spin fluctuations in La 2-xSrxCuO4",

abstract = "Neutron scattering experiments for La1.85Sr 0.15Cu0.98Ni0.02O4 (Tc=28 K) demonstrated that well-defined incommensurate peaks appear in the superconducting state, giving an enhancement of χ″(q IC,ω) at ∼1 meV associated with a sharpening of peak width. Thus, the Ni impurities induce low-energy excitations and smear the sharp edge structure in χ″(qIC,ω) reported from the Ni-free system. On the other hand, no clear signature of magnetic ordering was observed in the elastic channel even at the lowest temperature. We conjecture that spin fluctuations around Ni impurities never quench but gradually slow down over a wide space, in contrast to Zn doping which locally destroys superconductivity in a drastic manner.",

keywords = "LaSrCuO, Neutron scattering, Ni substitution, Spin fluctuations",

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

year = "2004",

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

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number = "1-4",

note = "Proceedings of the International Conference on Materials ; Conference date: 25-05-2003 Through 30-05-2003",

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TY - JOUR

T1 - Effect of magnetic impurities on spin fluctuations in La 2-xSrxCuO4

AU - Hiraka, H.

AU - Churei, T.

AU - Endoh, Y.

AU - Matsuda, M.

AU - Yamada, K.

PY - 2004/8

Y1 - 2004/8

N2 - Neutron scattering experiments for La1.85Sr 0.15Cu0.98Ni0.02O4 (Tc=28 K) demonstrated that well-defined incommensurate peaks appear in the superconducting state, giving an enhancement of χ″(q IC,ω) at ∼1 meV associated with a sharpening of peak width. Thus, the Ni impurities induce low-energy excitations and smear the sharp edge structure in χ″(qIC,ω) reported from the Ni-free system. On the other hand, no clear signature of magnetic ordering was observed in the elastic channel even at the lowest temperature. We conjecture that spin fluctuations around Ni impurities never quench but gradually slow down over a wide space, in contrast to Zn doping which locally destroys superconductivity in a drastic manner.

AB - Neutron scattering experiments for La1.85Sr 0.15Cu0.98Ni0.02O4 (Tc=28 K) demonstrated that well-defined incommensurate peaks appear in the superconducting state, giving an enhancement of χ″(q IC,ω) at ∼1 meV associated with a sharpening of peak width. Thus, the Ni impurities induce low-energy excitations and smear the sharp edge structure in χ″(qIC,ω) reported from the Ni-free system. On the other hand, no clear signature of magnetic ordering was observed in the elastic channel even at the lowest temperature. We conjecture that spin fluctuations around Ni impurities never quench but gradually slow down over a wide space, in contrast to Zn doping which locally destroys superconductivity in a drastic manner.

KW - LaSrCuO

KW - Neutron scattering

KW - Ni substitution

KW - Spin fluctuations

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U2 - 10.1016/j.physc.2004.03.127

DO - 10.1016/j.physc.2004.03.127

M3 - Conference article

AN - SCOPUS:4344687972

SN - 0921-4534

VL - 408-410

SP - 775

EP - 777

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-4

T2 - Proceedings of the International Conference on Materials

Y2 - 25 May 2003 through 30 May 2003

ER -

Effect of magnetic impurities on spin fluctuations in La _2-xSr_xCuO₄

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