J. Phys. Soc. Jpn. 80 (2011) Supplement B SB026 (4 pages) |Previous Article| |Next Article| |Table of Contents|
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Proceedings of the International Workshop on Neutron Applications on Strongly Correlated Electron Systems 2011 (NASCES11)
Incommensurate Magnetic Excitation in Spin-Glass Phase of Bi2201 Cuprate
Department of Physics, Tohoku University, Sendai 980-8578, Japan
1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan
3Brookhaven National Laboratory, Upton, NY 11973-5000, U.S.A.
4World-Premier-International Research Center Initiative, Tohoku University, Sendai 980-8577, Japan
(Received May 16, 2011)
Static and dynamic magnetic susceptibilities of lightly-doped Bi2.4Sr1.6CuO6+y were studied by a SQUID magnetometer and triple-axis neutron spectrometers. The static magnetic susceptibility showed a difference between field-cooled and zero-field-cooled processes at low temperature, showing a spin-glass-like behavior. The irreversibility temperature was determined to be Tsg ∼3 K, which is slightly lower than Tsg of 5–6 K in the lightly-doped LSCO with similar hole concentration. Furthermore, we have confirmed the existence of low-energy spin fluctuations with the spatially modulated spin correlation along diagonal to Cu–O bond direction in the Bi2201 system for the first time. This observation is consistent with the previously reported result for the spin-glass phase of LSCO. The magnetic intensity χ′′(ω) measured at the energy transfer of 1 meV drastically developed below 100 K, while that at 6 meV shows a gradual increase below 200 K with decreasing the temperature. Although the spin fluctuations slow down upon cooling, no well defined static order was detected even at 6 K. Our results suggest that the diagonal incommensurate spin correlation is common in the spin-glass phase of single layer cuprate-oxide. The development of static component, however, is different between the Bi2201 and LSCO systems and would be affected by the interlayer coupling and/or the cation disorder on the A-site.
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