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Journal Articles

Magnetic excitations in overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$

Wakimoto, Shuichi; Yamada, Kazuyoshi*; Tranquada, J. M.*; Frost, C. D.*; Swainson, I.*; Birgeneau, R. J.*

Physica C, 460-462(1), p.166 - 169, 2007/09

https://doi.org/10.1016/j.physc.2007.03.306
 Times Cited Count：1 Percentile：6.7(Physics, Applied)

Spin excitations of overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ ($$0.25 leq x leq 0.30$$) have been studied by neutron scattering utilizing triple-axis and time-of-flight spectrometers. Low-energy excitation spectra ($$omega leq 10$$ $$sim$$meV) for all of the superconducting samples show a maximum around $$omega = 6$$ meV with a maximum value of dynamic spin susceptibility $$chi''(omega)$$ that decreases linearly with ${it T$_{rm c}$}$ as doping increases. The magnetic scattering cross section finally disappears at $$x=0.30$$, coincident with the disappearance of bulk superconductivity. Time-of-flight measurements for $$x=0.25$$ and $$0.30$$ shows markedly suppressed magnetic scattering intensities at intermediate energies (20$$leq$$$$omega$$$$leq$$80$$sim$$meV) in contrast to those of the stripe-ordered La$$_{1.875}$$Ba$$_{0.125}$$CuO$$_{4}$$. These facts imply a cooperative correlation between the dynamic incommensurate state and the superconductivity.

Journal Articles

Relationship between the superconducting gap and the pseudogap; Temperature-dependent photoemission study of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ and La$$_{2}$$CuO$$_{4.10}$$

Hashimoto, Makoto*; Tanaka, Kiyohisa*; Yoshida, Teppei*; Fujimori, Atsushi*; Okusawa, Makoto*; Wakimoto, Shuichi; Yamada, Kazuyoshi*; Kakeshita, Teruhisa*; Eisaki, Hiroshi*; Uchida, Shinichi*

Physica C, 460-462(2), p.884 - 885, 2007/09

https://doi.org/10.1016/j.physc.2007.03.181
 Times Cited Count：3 Percentile：17.87(Physics, Applied)

In the high-${it T$_{rm c}$}$ research, relationship between the pseudogap and the superconducting gap has been an important issue. We have performed a detailed temperature-dependent angle-integrated photoemission study of lightly-doped to heavily-overdoped La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ and oxygen-doped La$$_{2}$$CuO$$_{4.10}$$. We found that, while the magnitude of the pseudogap increased with decreasing doping, that of the superconducting gap did not increase. This behavior can be explained if the superconducting gap opens only on the Fermi arc around the node (0,0)-($$pi$$,$$pi$$) whereas the pseudogap opens primarily around ($$pi$$,0).

Journal Articles

Collective macroscopic tunneling in intrinsic Josephson junctions

Machida, Masahiko; Koyama, Tomio*

Physica C, 460-462(1), p.289 - 292, 2007/09

https://doi.org/10.1016/j.physc.2007.03.352
 Times Cited Count：0 Percentile：0(Physics, Applied)

no abstracts in English

Journal Articles

Vortex microscopic structure in BCS to BEC Fermi superfluids

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

Physica C, 460-462(1), p.275 - 276, 2007/09

https://doi.org/10.1016/j.physc.2007.03.431
 Times Cited Count：1 Percentile：6.7(Physics, Applied)

no abstracts in English

Journal Articles

$$mu$$SR study of impurity effects on the Cu-spin fluctuations in the overdoped regime of La$$_{2-x}$$Sr$$_x$$Cu$$_{1-y}$$Zn$$_y$$O$$_4$$

Risdiana*; Adachi, Tadashi*; Oki, Naoki*; Yairi, Satoshi*; Tanabe, Yoichi*; Omori, Keisuke*; Suzuki, Takao*; Watanabe, Isao*; Koda, Akihiro*; Higemoto, Wataru; et al.

Physica C, 460-462(2), p.874 - 875, 2007/09

https://doi.org/10.1016/j.physc.2007.03.372
 Times Cited Count：3 Percentile：17.87(Physics, Applied)

Zero-field muon-spin-relaxation measurements have been carried out for La$$_{2-x}$$Sr$$_x$$Cu$$_{1-y}$$Zn$$_y$$O$$_4$$ (LSCO)with $$y$$ = 0-0.10 in the overdoped regime up to $$x$$ = 0.30, in order to investigate whether the dynamical stripe correlations are pinned and stabilized even for the overdoped LSCO or not. It has been found that the Zn-induced slowing down of the Cu-spin fluctuations is weakened with increasing $$x$$ but takes place in the overdoped regime and disappears at $$x$$ = 0.30. This suggests that the stripe-pinning model holds good in the whole superconducting regime of LSCO and that there is no quantum critical point at $$x$$ $$sim$$ 0.19.

Journal Articles

The Anisotropy of the superfluid density in noncentrosymmetric CePt$$_3$$Si

Bonalde, I.*; Br$"a$mer-Escamilla, W.*; Haga, Yoshinori; Bauer, E.*; Yasuda, Takashi*; Onuki, Yoshichika

Physica C, 460-462(1), p.659 - 660, 2007/09

https://doi.org/10.1016/j.physc.2007.03.029
 Times Cited Count：4 Percentile：22.69(Physics, Applied)

Oral presentation

Photoemission studies on heavy fermion superconductors

Fujimori, Shinichi; Saito, Yuji; Okane, Tetsuo; Yamagami, Hiroshi; Fujimori, Atsushi*; Shimada, Kenya*; Namatame, Hirofumi*; Taniguchi, Masaki*; Aoki, Dai*; Ikeda, Shugo*; et al.

no journal, , 

no abstracts in English

7 (Records 1-7 displayed on this page)
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