SoAS - Scholarly Publications: Recent submissions

Now showing items 21-40 of 2078

Slater to Mott Crossover in the Metal to Insulator Transition of Nd2⁢Ir2⁢O7

Nakayama, M.; Kondo, Takeshi; Tian, Z.; Ishikawa, J. J.; Halim, M.; Bareille, C.; Malaeb, W.; Kuroda, K.; Tomita, T. (2016-07-27)

We present an angle-resolved photoemission study of the electronic structure of the three-dimensional pyrochlore iridate Nd2⁢Ir2⁢O7 through its magnetic metal-insulator transition. Our data reveal that metallic Nd2⁢Ir2⁢O7 ...
Point nodes persisting far beyond Tc in Bi2212

Kondo, Takeshi; Malaeb, W.; Ishida, Y.; Sasagawa, T.; Sakamoto, H.; Takeuchi, Tsunehiro; Tohyama, T.; Shin, S. (2015-07-09)

In contrast to a complex feature of antinodal state, suffering from competing orders, the pairing gap of cuprates is obtained in the nodal region, which therefore holds the key to the superconducting mechanism. One of the ...
Quadratic Fermi node in a 3D strongly correlated semimetal

Kondo, Takeshi; Nakayama, M.; Chen, R.; Ishikawa, J. J.; Moon, E.-G.; Yamamoto, T.; Ota, Y.; Malaeb, W.; Kanai, H.; Nakashima, Y.; Ishida, Y. (2015-12-07)

Strong spin–orbit coupling fosters exotic electronic states such as topological insulators and superconductors, but the combination of strong spin–orbit and strong electron–electron interactions is just beginning to be ...
Electronic structure of observed by angle-resolved photoemission spectroscopy

Ideta, S.; Yoshida, T.; Nakajima, M.; Malaeb, W.; Kito, H.; Eisaki, H.; Iyo, A.; Tomioka, Y.; Ito, T. (2014-05-28)

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of BaNi2⁢𝑃2 that shows a superconducting transition at 𝑇𝑐 ∼ 2.5 K. We observed hole and electron Fermi surfaces (FSs) around the Brillouin ...
Evidence for excluding the possibility of 𝑑-wave superconducting-gap symmetry in Ba-doped KFe2As2

Ota, Y.; Okazaki, K.; Kotani, Y.; Shimojima, T.; Malaeb, W.; Watanabe, S.; Chen, C.-T.; Kihou, K. (2014-02-04)

We have investigated the superconducting (SC)-gap anisotropy for several Ba-doped KFe2As2 samples using laser-based angle-resolved photoemission spectroscopy. We show that the SC-gap anisotropy and node positions drastically ...
Evidence of a universal relation between electron-mode coupling and 𝑇�𝑐� in Ba1−𝑥�⁢K𝑥�⁢Fe2⁢As2 superconductor from laser angle-resolved photoemission spectroscopy

Malaeb, W.; Shimojima, T.; Ishida, Y.; Kondo, T.; Okazaki, K.; Ota, Y.; Ohgushi, K.; Kihou, K.; Lee, C. H. (2014-11-13)

We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of the Ba1−𝑥⁢K𝑥⁢Fe2⁢As2 (BaK) iron-based superconductor. We observed a robust low-binding energy (BE) kink structure ...
Pseudogap formation above the superconducting dome in iron pnictides

Shimojima, T.; Sonobe, T.; Malaeb, W.; Shinada, K.; Chainani, A.; Shin, S.; Yoshida, T.; Ideta, S.; Fujimori, A. (2014-01-03)

The nature of the pseudogap (PG) in high transition temperature (high 𝑇𝑐) superconducting cuprates has been a major issue in condensed matter physics. It is still unclear whether the high 𝑇𝑐 superconductivity can be ...
Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As1-xPx)2

Yoshida, T.; Ideta, S.; Shimojima, T.; Malaeb, W.; Shinada, K.; Suzuki, H.; Nishi, I.; Fujimori, A.; Ishizaka, K. (2014-12-03)

We report peculiar momentum-dependent anisotropy in the superconducting gap observed by angle-resolved photoemission spectroscopy in BaFe2(As1-xPx)2 (x = 0.30, Tc = 30 K). Strongly anisotropic gap has been found only in ...
Strongly Spin-Orbit Coupled Two-Dimensional Electron Gas Emerging near the Surface of Polar Semiconductors

Sakano, M.; Bahramy, M. S.; Katayama, A.; Shimojima, T.; Murakawa, H.; Kaneko, Y.; Malaeb, W.; Shin, S.; Ono, K. (2013-03-07)

We investigate the two-dimensional highly spin-polarized electron accumulation layers commonly appearing near the surface of 𝑛-type polar semiconductors BiTe⁢𝑋 (𝑋 =I, Br, and Cl) by angular-resolved photoemission ...
Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2

Okazaki, K.; Ota, Y.; Kotani, Y.; Malaeb, W.; Ishida, Y.; Shimojima, T.; Kiss, T.; Watanabe, S.; Chen, C.-T. (2012-09-14)

In iron-pnictide superconductivity, the interband interaction between the hole and electron Fermi surfaces (FSs) is believed to play an important role. However, KFe2As2 has three zone-centered hole FSs and no electron FS ...
Effects of Zn substitution on the electronic structure of BaFe2As2 revealed by angle-resolved photoemission spectroscopy

Ideta, S.; Yoshida, T.; Nakajima, M.; Malaeb, W.; Shimojima, T.; Ishizaka, K.; Fujimori, A.; Kimigashira, H.; Ono, K. (2013-05-31)

In Fe-based superconductors, electron doping is often realized by the substitution of transition-metal atoms for Fe. In order to investigate how the electronic structure of the parent compound is influenced by Zn substitution, ...
Anomalous Dressing of Dirac Fermions in the Topological Surface State of Bi2⁢Se3, Bi2⁢Te3, and Cu-Doped Bi2⁢Se3

Kondo, Takeshi; Nakashima, Y.; Ota, Y.; Ishida, Y.; Malaeb, W.; Okazaki, K.; Shin, S.; Kriener, M.; Sasaki, Satoshi; Segawa, Kouji; Ando, Yoichi (2013-05-23)

Quasiparticle dynamics on the topological surface state of Bi2⁢Se3, Bi2⁢Te3, and superconducting Cu𝑥⁢Bi2⁢Se3 are studied by 7 eV laser-based angle resolved photoemission spectroscopy. We find strong mode couplings in the ...
Angle-resolved photoemission study on the superconducting iron-pnictides of BaFe2(As,P)2 with low energy photons

Shimojima, T.; Sakaguchi, F.; Ishizaka, K.; Ishida, Y.; Malaeb, W.; Yoshida, T.; Ideta, S.; Fujimori, A.; Kiss, T.; Okawa, M. (2012-04)

We investigate the kz dispersion in the hole Fermi surfaces (FSs) and the superconducting (SC) gaps of BaFe 2(As 0.65P 0.35) 2 by employing bulk-sensitive angle-resolved photoemission spectroscopy (ARPES) with low energy ...
Observation of two fine structures related to the hidden order in the spectral functions of URu2Si2

Yoshida, Rikiya; Fukui, Masaki; Haga, Yoshinori; Yamamoto, Etsuji; Onuki, Yoshichika; Okawa, Mario; Malaeb, Walid; Shin, Shik; Muraoka, Yuji (2012-06-12)

We studied the spectral functions of URu2Si2 in the hidden-order state by means of ultrahigh-resolution angle-resolved photoemission spectroscopy. High signal-to-noise ratio data uncover the existence of two anomalous fine ...
Abrupt change in the energy gap of superconducting Ba1−𝑥�K𝑥�Fe2As2 single crystals with hole doping

Malaeb, W.; Shimojima, T.; Ishida, Y.; Okazaki, K.; Ota, Y.; Ohgushi, K.; Kihou, K.; Saito, T.; Lee, C. H. (2012-10-10)

We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1−𝑥K𝑥Fe2As2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The ...
Three-Dimensional Electronic Structure of Superconducting Iron Pnictides Observed by Angle-Resolved Photoemission Spectroscopy

Malaeb, Walid; Yoshida, Teppei; Fujimori, Atsushi; Kubota, Masato; Ono, Kanta; Kihou, Kunihiro; Shirage, Parasharam M.; Kito, Hijiri (2009-11-25)

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the undoped and electron-doped iron pnictides BaFe 2- x Co x As 2 (Ba122) ( x = 0, 0.14) and studied the Fermi surfaces (FSs) and band dispersions ...
Common Origin of the Circular-Dichroism Pattern in Angle-Resolved Photoemission Spectroscopy of SrTiO3 and Cu𝑥��⁢Bi2⁢Se3

Ishida, Y.; Kanto, H.; Kikkawa, A.; Taguchi, Y.; Ito, Y.; Ota, Y.; Okazaki, K.; Malaeb, W. (2011-08-09)

Circular dichroism in the angular distribution of photoelectrons from SrTiO3:Nb and Cu𝑥⁢Bi2⁢Se3 is investigated by 7-eV laser angle-resolved photoemission spectroscopy. In addition to the well-known node that occurs in ...
Photoemission study of the electronic structure of LaFeAsO 1-xFx and LaFePO1-xFx

Malaeb, Walid; Yoshida, Teppei; Kataoka, Takashi; Fujimori, Atsushi; Kubota, Masato; Ono, Kanta; Usui, Hidetomo; Kuroki, Kazuhiko; Arita, Ryotaro; Aoki, Hideo (2008)

We have performed a photoemission spectroscopy study of the newly discovered iron-based superconductors LaFeAsO1-xFx and LaFePO1-xFx. The valence-band spectra show a narrow Fe 3d-derived band near EF indicating the itinerant ...
Electronic Structure and Electron Correlation in LaFeAsO1-xFx and LaFePO1-xFx

Malaeb, Walid; Yoshida, Teppei; Kataoka, Takashi; Fujimori, Atsushi; Kubota, Masato; Ono, Kanta; Usui, Hidetomo (2008)

Photoemission spectroscopy is used to investigate the electronic structure of the newly discovered iron-based superconductors LaFeAsO 1- x F x and LaFePO 1- x F x . Line shapes of the Fe 2 p core-level spectra suggest an ...
A Central Finite Volume Surface Gradient Method for the Two-Layer Shallow Water Equations with Rigid Lid

Touma, Rony; Lteif, Ralph (Springer, 2025-02-07)

We develop here a new formulation of the two-layer shallow water equations with rigid-lid on variable-bottom topography. This formulation is presented as a conservative system where the function describing the geometry of ...

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