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We have carried out first principles all-electron calculations of the (001)-projected 2D electron momentum density and the directional Compton profiles along the [100], [001] and [110] directions in the Fe-based superconductor LaOFeAs…

Strongly Correlated Electrons · Physics 2010-02-08 Y. J. Wang , Hsin Lin , B. Barbiellini , P. E. Mijnarends , S. Kaprzyk , W. Al-Sawai , R. S. Markiewicz , A. Bansil

The magnetic properties in the parent compounds are often intimately related to the microscopic mechanism of superconductivity. Here we report the first direct measurements on the electronic structure of a parent compound of the newly…

This paper reviews quantum oscillation studies of iron-pnictide superconductors and related materials. These measurements give unique information regarding the full three dimensional topology of the Fermi surfaces and the renormalisation of…

Superconductivity · Physics 2015-05-30 A. Carrington

The electronic structure of ThPd$_2$Al$_3$, which is isostructural to the heavy fermion superconductor UPd$_2$Al$_3$, was investigated by photoelectron spectroscopy. The band structure and Fermi surfaces of ThPd$_2$Al$_3$ were obtained by…

Strongly Correlated Electrons · Physics 2022-04-06 Shin-ichi Fujimori , Yukiharu Takeda , Hiroshi Yamagami , Jiří Pospíšil , Etsuji Yamamoto , Yoshinori Haga

A detailed knowledge of the gap structure for the Fe-pnictide superconductors is still rather rudimentary, with several conflicting reports of either nodes, deep gap minima, or fully isotropic gaps on the Fermi surface sheets, both in the…

Superconductivity · Physics 2010-11-03 I. I. Mazin , T. P. Devereaux , J. G. Analytis , Jiun-Haw Chu , I. R. Fisher , B. Muschler , R. Hackl

We have investigated the electronic structure of BiS$_2$-based CeO$_{0.5}$F$_{0.5}$BiS$_2$ superconductor using polarization-dependent angle-resolved photoemission spectroscopy (ARPES), and succeeded in elucidating the orbital characters on…

We have performed an angle-resolved photoemission study of the hole-overdoped iron pnictide superconductor KFe2As2, which shows a low Tc of ~4 K. Most of the observed Fermi surfaces show nearly two-dimensional shapes, while a band near the…

Strongly Correlated Electrons · Physics 2015-08-07 T. Yoshida , S. Ideta , I. Nishi , A. Fujimori , M. Yi , R. G. Moore , S. K. Mo , D. -H. Lu , Z. -X. Shen , Z. Hussain , K. Kihou , P. M. Shirage , H. Kito , C. H. Lee , A. Iyo , H. Eisaki , H. Harima

We report the electronic structure and related properties of the superconductor Ta2PdSe5 as determined from density functional calculations. The Fermi surface has two disconnected sheets, both derived from bands of primarily chalcogenide p…

Superconductivity · Physics 2015-04-28 David J. Singh

A long-standing unsolved problem is how a microscopic theory of superconductivity in cuprate superconductors based on the charge-spin separation can produce a large electron Fermi surface. Within the framework of the kinetic-energy driven…

Superconductivity · Physics 2015-07-21 Shiping Feng , Lulin Kuang , Huaisong Zhao

Layered indium selenides ($In_{2}Se_{3}$) have recently been discovered to host robust out-of-plane and in-plane ferroelectricity in the $\alpha$ and $\beta$' phases, respectively. In this work, we utilise angle-resolved photoelectron…

We investigate electronic structure of the new iron chalcogenide high temperature superconductor K{1-x}Fe{2-y}Se2 (hole doped case with x=0.24, y=0.28) in the normal phase using the novel LDA'+DMFT computational approach. We show that this…

Strongly Correlated Electrons · Physics 2013-03-27 I. A. Nekrasov , N. S. Pavlov , M. V. Sadovskii

The fate of the Fermi surface in bulk electron-doped Sr$_{2}$IrO$_{4}$ remains elusive, as does the origin and extension of its pseudogap phase. Here, we use high-resolution angle-resolved photoelectron spectroscopy (ARPES) to investigate…

We have investigated the electronic structures of recently discovered superconductor FeSe by soft-x-ray and hard-x-ray photoemission spectroscopy with high bulk sensitivity. The large Fe 3d spectral weight is located in the vicinity of the…

Hole-doped high-temperature cuprate superconductors below optimum doping have small electron-like Fermi surfaces occupying a small fraction of the Brillouin zone. There is strong evidence that this is linked to charge density wave (CDW)…

Superconductivity · Physics 2016-03-09 A. Briffa , E. Blackburn , S. M. Hayden , E. A. Yelland , M. W. Long , E. M. Forgan

Using angle-resolved photoemission spectroscopy (ARPES), we have observed the band structure, Fermi surface and their doping dependences in La2-xSrxCuO4. The results reveal that the Fermi surface undergoes a dramatic change: it is hole-like…

Superconductivity · Physics 2009-10-31 A. Ino , C. Kim , T. Mizokawa , Z. -X. Shen , A. Fujimori , M. Takaba , K. Tamasaku , H. Eisaki , S. Uchida

We reproduce the electronic properties of FeSe in the high-temperature phase within an ab initio framework that includes screened Fock exchange and local dynamical correlations. We robustly capture the experimental band structure, as long…

Strongly Correlated Electrons · Physics 2021-07-21 Tommaso Gorni , Pablo Villar Arribi , Michele Casula , Luca de' Medici

Locally noncentrosymmetric structures in crystals are attracting much attention owing to emergent phenomena associated with the sublattice degree of freedom. The newly discovered heavy fermion superconductor CeRh$_2$As$_2$ is considered to…

Superconductivity · Physics 2024-10-25 Jun Ishizuka , Kosuke Nogaki , Manfred Sigrist , Youichi Yanase

The three-dimensional Fermi surface morphology of superconducting BaFe_2(As_0.37}P_0.63)_2 with T_c=9K, is determined using the de Haas-van Alphen effect (dHvA). The inner electron pocket has a similar area and k_z interplane warping to the…

Superconductivity · Physics 2010-11-16 J. G. Analytis , J. -H. Chu , R. D. McDonald , S. C. Riggs , I. R. Fisher

The recently reported nickel carbide superconductor, body centered tetragonal $I4/mmm$ Th$_2$NiC$_2$ with T$_c$ = 8.5 K increasing to 11.2 K upon alloying Th with Sc, is found to have very fine structure in its electronic spectrum,…

Materials Science · Physics 2013-07-02 Y. Quan , W. E. Pickett

We performed polarization- and photon-energy-dependent angle-resolved photoemission spectroscopy of a slightly overdoped iron pnictide superconductor, BaFe$_{1.8}$Co$_{0.2}$As$_{2}$, to clarify the three-dimensional electronic structure…

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