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1,176 results on '"Kuroki, K."'

102. Theoretical study of the chemical pressure effect on Tc in the cuprate superconductors

Author

Sakakibara, H., Suzuki, K., Usui, H., Kuroki, K., Arita, R., Aoki, H., Sakakibara, H., Suzuki, K., Usui, H., Kuroki, K., Arita, R., and Aoki, H.

Abstract

Application of physical pressure on the cuprate superconductors often results in an enhancement of Tc. Motivated by this fact, we study the chemical pressure effect on the single-layered La2CuO4 and HgBa2CuO4 starting from the two-orbital Hubbard model deduced from a first-principles calculation. It is shown that the chemical pressure effects induced by La-site substitution in La2CuO4 or Hg-site substitution in HgBa2CuO4 are not expected to be effective for raising Tc.

Published
2019

103. Three-orbital study on the orbital distillation effect in the high Tc cuprates

Author

Sakakibara, H., Suzuki, K., Usui, H., Kuroki, K., Arita, R., Scalapino, D.J., Aoki, H., Sakakibara, H., Suzuki, K., Usui, H., Kuroki, K., Arita, R., Scalapino, D.J., and Aoki, H.

Abstract

Our recent study has revealed that the mixture of the dz2 orbital component into the Fermi surface suppresses Tc in the cuprates such as La2CuO4. We have also shown that applying hydrostatic pressure enhances Tc due to smaller mixing of the Cu4s component. We call these the “orbital distillation” effect. In our previous study, the 4s orbital was taken into account through the hoppings in the dx2-y2 sector, but here we consider a model in which of the dx2-y2, dz2 and 4s orbitals are all considered explicitly. The present study reinforces our conclusion that smaller 4s hybridization further enhances Tc.

Published
2019

118. Crystal structure of TOXIN/ANTITOXIN complex

Author

Shioi, N., primary, Tadokoro, T., additional, Shioi, S., additional, Hu, Y., additional, Kurahara, L.H., additional, Okabe, Y., additional, Matsubara, H., additional, Kita, S., additional, Ose, T., additional, Kuroki, K., additional, Maenaka, K., additional, and Terada, S., additional

Published
2018
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126. Steep MR change in NiFe/Cu/Co trilayers

Author

Tanuma, T., Takahashi, S., Maeda, A., Kume, M., and Kuroki, K.

Subjects
Thin films, Multilayered -- Evaluation, Magnetic materials -- Analysis, Magnetic alloys -- Analysis, Business, Electronics, Electronics and electrical industries
Published
1995

127. Photon angular distributions of the relativistic radiative electron capture

Author

Awaya, Y., Hino, K., Hitachi, A., Kanai, Y., Kawatsura, K., Kuroki, K., Vogt, H., Yamazaki, Y., Watanabe, T., Araki, H., editor, Ehlers, J., editor, Hepp, K., editor, Kippenhahn, R., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Berényi, D., editor, and Hock, G., editor

Published
1988
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128. Fermi-Surface Topological Phase Transition and Horizontal Order-Parameter Nodes in CaFe2As2 Under Pressure

Author

Gonnelli, R. S., Daghero, D., Tortello, M., Ummarino, G. A., Bukowski, Z., Karpinski, J., Reuvekamp, P. G., Kremer, R. K., Profeta, G., Suzuki, K., and Kuroki, K.

Subjects
Superconductivity (cond-mat.supr-con), Fe-based superconductors, pressure, Electronic properties and materials, Multidisciplinary, Condensed Matter - Superconductivity, point-contact spectroscopy, Superconducting properties and materials, FOS: Physical sciences, superconducting order parameter, Article
Abstract

Iron-based compounds (IBS) display a surprising variety of superconducting properties that seems to arise from the strong sensitivity of these systems to tiny details of the lattice structure. In this respect, systems that become superconducting under pressure, like CaFe2As2, are of particular interest. Here we report on the first directional point-contact Andreev-reflection spectroscopy (PCARS) measurements on CaFe2As2 crystals under quasi-hydrostatic pressure, and on the interpretation of the results using a 3D model for Andreev reflection combined with ab-initio calculations of the Fermi surface (within the density functional theory) and of the order parameter symmetry (within a random-phase-approximation approach in a ten-orbital model). The almost perfect agreement between PCARS results at different pressures and theoretical predictions highlights the intimate connection between the changes in the lattice structure, a topological transition in the holelike Fermi surface sheet, and the emergence on the same sheet of an order parameter with a horizontal node line., Scientific Reports, 6, ISSN:2045-2322

Published
2016
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132. Crystal structure of human paired immunoglobulin-like type 2 receptor alpha with synthesized glycopeptide I

Author

Furukawa, A., primary, Kakita, K., additional, Yamada, T., additional, Ishizuka, M., additional, Sakamoto, J., additional, Hatori, N., additional, Maeda, N., additional, Ohsaka, F., additional, Saitoh, T., additional, Nomura, T., additional, Kuroki, K., additional, Nambu, H., additional, Arase, H., additional, Matsunaga, H., additional, Anada, M., additional, Ose, T., additional, Hashimoto, S., additional, and Maenaka, K., additional

Published
2017
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136. P870Pulmonary vein isolation using a novel radiofrequency hot-balloon catheter in patients with paroxysmal atrial fibrillation: initial results using an antrum ablation technique

Author

Yamasaki, H., primary, Yamagami, F., additional, Shinoda, Y., additional, Adachi, TORU, additional, Hattori, A., additional, Komatsu, Y., additional, Masuda, K., additional, Machino, T., additional, Kuroki, K., additional, Sekiguchi, Y., additional, Yamaguchi, I., additional, Nogami, A., additional, and Aonuma, K., additional

Published
2017
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138. P1441The characteristics of superior vena cava isolation, which is useful to avoid procedural complications: the findings obtained from high- resolution substrate mapping

Author

Yoshizawa, R., primary, Kuroki, K., additional, Hashimoto, N., additional, Yamagami, F., additional, Shinoda, Y., additional, Hattori, A., additional, Masuda, K., additional, Adachi, T., additional, Komatsu, Y., additional, Machino, T., additional, Yamasaki, H., additional, Sekiguchi, Y., additional, Nogami, A., additional, Yamaguchi, I., additional, and Aonuma, K., additional

Published
2017
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139. P1628Acute and long-term results of bipolar radiofrequency catheter ablation of refractory ventricular arrhythmias with deep intramural origins

Author

Igarashi, M., primary, Nogami, A., additional, Sekiguchi, Y., additional, Nitta, J., additional, Sakamoto, N., additional, Kurosaki, K., additional, Takahashi, Y., additional, Komatsu, Y., additional, Machino, T., additional, Kuroki, K., additional, Yamasaki, H., additional, Iesaka, Y., additional, and Aonuma, K., additional

Published
2017
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146. Bulk sensitive angle-resolved photoelectron spectroscopy on Nd(O,F)BiS2

Author

Terashima, K, primary, Sonoyama, J, additional, Sunagawa, M, additional, Fujiwara, H, additional, Nagayama, T, additional, Muro, T, additional, Nagao, M, additional, Watauchi, S, additional, Tanaka, I, additional, Okazaki, H, additional, Takano, Y, additional, Mizuguchi, Y, additional, Usui, H, additional, Suzuki, K, additional, Kuroki, K, additional, Wakita, T, additional, Muraoka, Y, additional, and Yokoya, T, additional

Published
2016
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147. Comparative ARPES studies of LaOxF1−xBiS2(x = 0.23 and 0.46)

Author

Terashima, K, primary, Wakita, T, additional, Sunagawa, M, additional, Fujiwara, H, additional, Nagayama, T, additional, Ono, K, additional, Kumigashira, H, additional, Nagao, M, additional, Watauchi, S, additional, Tanaka, I, additional, Okazaki, H, additional, Takano, Y, additional, Mizuguchi, Y, additional, Usui, H, additional, Kuroki, K, additional, Muraoka, Y, additional, and Yokoya, T, additional

Published
2016
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149. Thermoelectric properties of (Ba,K)Cd2As2 crystallized in the CaAl2Si2-type structure.

Author

Kunioka, H., Kihou, K., Nishiate, H., Yamamoto, A., Usui, H., Kuroki, K., and Lee, C. H.

Subjects
THERMOELECTRICITY, CALCIUM compounds, THERMAL conductivity
Abstract

As-Based Zintl compounds Ba1−xKxCd2As2 crystallized in the CaAl2Si2-type structure (space group P3̅m1) were prepared using solid-state reactions followed by hot-pressing. We have successfully substituted K for Ba up to x = 0.08, producing hole-carrier doping with concentrations up to 1.60 × 1020 cm−3. We have determined the band-gap value of non-doped BaCd2As2 to be 0.40 eV from the temperature dependence of the electrical resistivity. Both the electrical resistivity and the Seebeck coefficient decrease with hole doping, leading to a power factor value of 1.28 mW m−1 K−2 at 762 K for x = 0.04. A first-principles band calculation shows that the relatively large power factor mainly originates from the two-fold degeneracy of the bands comprising As px,y orbitals and from the anisotropic band structure at the valence-band maximum. The lattice thermal conductivity is suppressed by the K doping to 0.46 W m−1 K−1 at 773 K for x = 0.08, presumably due to randomness. The effect of randomness is compensated by an increase in the electronic thermal conductivity, which keeps the total thermal conductivity approximately constant. In consequence, the dimensionless figure-of-merit ZT reaches a maximum value of 0.81 at 762 K for x = 0.04. [ABSTRACT FROM AUTHOR]

Published
2018
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150. Starlikeness problems for certain analytic functions concerned with subordinations

Author

Shiraishi, H., Owa, S., Hayami, T., Kuroki, K., and Hari M. Srivastava

Subjects
Mathematics - Complex Variables, FOS: Mathematics, Complex Variables (math.CV), 30C45
Abstract

Let A_n be the class of functions f(z) which are analytic in the open unit disk U} with f(0)=0, f'(0)=1, f"(0)=f"'(0)=...=f^{(n)}=0 and f^{(n+1)}\neq0. Applying the results due to S. S. Miller (J. Math. Anal. Appl. 65(1978), 289-305), some interesting starlikeness problems concerned with subordinations are discussed. The results in the paper are extensions of results by M. Obradovi\'c (Hokkaido Math. J. 27(1998), 329-335).

Published
2013
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