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Journal Articles

Hybridization of Bogoliubov quasiparticles between adjacent CuO$$_2$$ layers in the triple-layer cuprate Bi$$_2$$Sr$$_2$$Ca$$_2$$Cu$$_3$$O$$_{10+delta}$$ studied by angle-resolved photoemission spectroscopy

Ideta, Shinichiro*; Johnston, S.*; Yoshida, Teppei*; Tanaka, Kiyohisa*; Mori, Michiyasu; Anzai, Hiroaki*; Ino, Akihiro*; Arita, Masashi*; Namatame, Hirofumi*; Taniguchi, Masaki*; et al.

Physical Review Letters, 127(21), p.217004_1 - 217004_6, 2021/11

 Times Cited Count:0 Percentile:0(Physics, Multidisciplinary)

Journal Articles

Thickness-dependent magnetic properties and strain-induced orbital magnetic moment in SrRuO$$_{3}$$ thin films

Ishigami, Keisuke*; Yoshimatsu, Kohei*; Toyota, Daisuke*; Takizawa, Masaru*; Yoshida, Teppei*; Shibata, Goro*; Harano, Takayuki*; Takahashi, Yukio*; Kadono, Toshiharu*; Verma, V. K.*; et al.

Physical Review B, 92(6), p.064402_1 - 064402_5, 2015/08

 Times Cited Count:36 Percentile:82.39(Materials Science, Multidisciplinary)

Journal Articles

Application of tritium tracer techniques to observation of hydrogen on surface and in bulk of F82H

Otsuka, Teppei*; Tanabe, Tetsuo*; Tokunaga, Kazutoshi*; Yoshida, Naoaki*; Ezato, Koichiro; Suzuki, Satoshi; Akiba, Masato

Journal of Nuclear Materials, 417(1-3), p.1135 - 1138, 2011/10

 Times Cited Count:2 Percentile:19.72(Materials Science, Multidisciplinary)

Journal Articles

Angle-resolved photoemission spectroscopy study of PrFeAsO$$_{0.7}$$; Comparison with LaFePO

Nishi, Ichiro*; Ishikado, Motoyuki; Ideta, Shinichiro*; Malaeb, W.*; Yoshida, Teppei*; Fujimori, Atsushi*; Kotani, Yoshinori*; Kubota, Masato*; Ono, Kanta*; Yi, M.*; et al.

Physical Review B, 84(1), p.014504_1 - 014504_5, 2011/07

 Times Cited Count:22 Percentile:66.92(Materials Science, Multidisciplinary)

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the iron-based superconductor PrFeAsO$$_{0.7}$$ and examined the Fermi surfaces and band dispersions near the fermi level. Heavily hole-doped electronic states have been observed due to the polar nature of the cleaved surfaces. Nevertheless, we have found that the ARPES spectra basically agree with band dispersions calculated in the local density approximation (LDA) if the bandwidth is reduced by a factor of $$sim$$ 2.5 and then the chemical potential is lowered by $$sim$$ 70 meV. Comparison with previous ARPES results on LaFePO reveals that the energy positions of the $$d$$$$_{3z^{2}-r^{2}}$$- and $$d$$$$_{yz,zx}$$-derived bands are considerably different between the two materials, which we attribute to the different pnictogen height as predicted by the LDA calculation.

Journal Articles

Crossover from coherent quasiparticles to incoherent hole carriers in underdoped cuprates

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

Physical Review B, 79(14), p.140502_1 - 140502_4, 2009/04

 Times Cited Count:13 Percentile:51.97(Materials Science, Multidisciplinary)

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

 Times Cited Count:3 Percentile:18.65(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

Distinct doping dependences of the pseudogap and superconducting gap of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ cuprate superconductors

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

Physical Review B, 75(14), p.140503_1 - 140503_4, 2007/04

 Times Cited Count:65 Percentile:89.32(Materials Science, Multidisciplinary)

We have performed a temperature-dependent angle-integrated photoemission study of La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ covering from lightly doped to heavily overdoped regions and oxygen -doped La$$_{2}$$CuO$$_{4.10}$$. The superconducting gap energy $$Delta_{sc}$$ was found to remain small for decreasing hole concentration while the pseudogap energy $$Delta^{*}$$ and temperature $$T^{*}$$ increase. The different behaviors of the superconducting gap and the pseudogap can be explained if the superconducting gap opens only on the Fermi arc around the nodal (0,0)-$$(pi,pi)$$ direction while the pseudogap opens around $$sim (pi,0)$$. The results suggest that the pseudogap and the superconducting gap have different microscopic origins.

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