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Ho-doping Effect on the Incommensurate Magnetic Order in La1.88Sr0.12CuO4
Masaki Fujita,Masanori Enoki,Kenji Tsutsumi,Satoshi Iikubo,Kazuyoshi Yamada 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed elastic neutron scattering experiments on the superconductorLa1.85Ho0.03Sr0.12CuO4 to study the effect of substitution of a cation with a large magnetic momentat La site on the static spin correlation. In the Ho-free sample with a hole concentration of 0.12,the spatially-modulated magnetic order is known to be stabilized at temperature below Tspin 30K. In the present Ho-doped sample, we found the appearance of magnetic peaks at (0.5, 0.5 ± 0.119, 0) positions below Tspin 35 K, which is similar to the observation in the pristine sample. Furthermore, the volume-corrected intensities in the Ho-free and Ho-doped samples are comparable,suggesting a negligible effect of Ho-substitution at La sites. These results are quite a contrast tothe huge enhancement of the magnetic intensity and the increase of Tspin by substituting a comparableamounts of magnetic Fe3+ ions onto CuO2 planes. Therefore, the stability of the stripe orderinduced by the cation substitution is sensitive to the site at which the substitution occurs.
High-energy Magnetic Excitations in Underdoped La1.90Sr0.10CuO4
Kentaro Sato,Masato Matsuura,Masaki Fujita,Ryoichi Kajimoto,Sungdae Ji,Kazuhiko Ikeuchi,Mitsutaka Nakamura,Yasuhiro Inamura,Masatoshi Arai,Masanori Enoki,Kazuyoshi Yamada 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We measured the magnetic excitations in underdoped (UD) La1.90Sr0.10CuO4 by using inelasticneutron scattering over a wide energy range. We succeeded in observing the high-energy excitationsup to '160 meV. Hour-glass-like magnetic excitation, which is commonly seen in the superconductingphase of cuprate oxides, was confirmed. The Ecross (the energy where the dispersion is closestto the ( 12 , 12 ) reciprocal position) of 40 meV follows a linear relation between Ecross and the dopedhole concentration in the UD region. From the dispersion of high-energy excitations above Ecross,we successfully found an effective nearest neighbor interaction (Jeff ) of 102 ± 2 meV. This Jeff issmaller than the nearest neighbor interaction J(=132 meV) in the parent compound La2CuO4,indicating a reduction of Jeff by hole-doping.