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Journal Articles

Vortex imaging of Tl-based superconductors with a scanning SQUID microscopy

Okayasu, Satoru; Nishio, Taichiro; Ono, Masao; Mashimo, Tsutomu; Tanaka, Yasutomo*; Iyo, Akira*

Physica C, 445-448, p.245 - 248, 2006/10

https://doi.org/10.1016/j.physc.2006.04.004
 Times Cited Count：1 Percentile：6.63(Physics, Applied)

Vortex imagings of Tl-2223 thin film are achieved below Tc with a scanning SQUID microscope. Vortex arrangements are almost the same just below Tc, indicating the existence of strong pinning centers in the sample. The origin of the strong pinning centers comes from the morphological inhomogeneity on the surface.

Journal Articles

Vortex structure in weak to strong coupling superconductors; Crossover from BCS to BEC

Machida, Masahiko; Koyama, Tomio*; Ohashi, Yoji*

Physica C, 445-448, p.194 - 197, 2006/10

https://doi.org/10.1016/j.physc.2006.03.113
 Times Cited Count：0 Percentile：0(Physics, Applied)

no abstracts in English

Journal Articles

Novel pairing in the Hubbard model with confinement potential

Machida, Masahiko; Yamada, Susumu; Ohashi, Yoji*; Matsumoto, Hideki*

Physica C, 445-448, p.90 - 93, 2006/10

https://doi.org/10.1016/j.physc.2006.03.086
 Times Cited Count：2 Percentile：12.56(Physics, Applied)

no abstracts in English

Oral presentation

Spin dynamics and magnetic properties of overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$

Wakimoto, Shuichi

no journal, , 

Spin excitation has been studied by neutron scattering experiments for the overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ for $$0.25 leq x leq 0.30$$. Incommensurate excitations have been observed for the superconducting samples for $$0.25 leq x leq 0.28$$. Energy spectrum of dynamic susceptibility for those samples shows maximum at 6 meV and no spin-gap is observed down to 2 meV. Interestingly the maximum dynamic susceptibility decreases linearly with decreasing $$T_c$$, and finally, the low energy excitation becomes unobservable at $$x=0.30$$ coincidentally with the disappearance of bulk superconductivity. This implies an intimate relationship between the superconductivity and the low energy spin excitation. Magnetization measurements of overdoped LSCO with and without Zn impurities have revealed that the superconductivity vanishes in the overdoped regime as a result of a competition between the superconductivity and paramagnetism which is induced even in the Zn-free overdoped LSCO. In this talk, we report details of these results together with results of recently measured high-energy magnetic excitations which show weakened magnetic correlations of the overdoped samples not only in the low energy region but also in the high energy region.

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