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The transition metal dichalcogenide PdTe$_2$ was recently shown to be a unique system where a type II Dirac semimetallic phase and a superconducting phase co-exist. This observation has led to wide speculation on the possibility of the…

Superconductivity · Physics 2018-01-31 Shekhar Das , Amit , Anshu Sirohi , Lalit Yadav , Sirshendu Gayen , Yogesh Singh , Goutam Sheet

We have performed an angle-resolved photoemission study of the iron pnictide superconductor KFe2As2 with Tc 4 K. Most of the observed Fermi surfaces show almost two-dimensional shapes, while one of the quasi-particle bands near the Fermi…

Strongly Correlated Electrons · Physics 2012-01-24 T. Yoshida , I. Nishi , A. Fujimori , M. Yi , R. G. Moore , D. -H. Lu , Z. -X. Shen , K. Kihou , P. M. Shirage , H. Kito , C. H. Lee , A. Iyo , H. Eisaki , H. Harima

Pd$_3$Bi$_2$Se$_2$ is a rare realization of a superconducting metal with a non-zero $Z_2$ topological invariant. We report the growth of high-quality single crystals of layered Pd$_3$Bi$_2$Se$_2$ with a superconducting transition at $T_c$ ~…

Strongly Correlated Electrons · Physics 2024-10-22 Ramakanta Chapai , Gordon Peterson , M. P. Smylie , Xinglong Chen , J. S. Jiang , David Graf , J. F. Mitchell , Ulrich Welp

This paper discusses the synthesis, characterization, and comprehensive study of Ba-122 single crystals with various substitutions and various $T_c$. The paper uses five complementary techniques to obtain a self-consistent set of data on…

We use electrical transport, magnetoresistance, and heat capacity measurements on high quality single crystals of the recently discovered superconducting Type-II Dirac semi-metal PdTe$_2$, to probe the nature of it's superconducting phase.…

Superconductivity · Physics 2018-01-11 Amit , Yogesh Singh

High resolution angle-resolved photoemission measurements have been carried out to study the electronic structure and superconducting gap of the (Tl$_{0.58}$Rb$_{0.42}$)Fe$_{1.72}$Se$_2$ superconductor with a T$_c$=32 K. The Fermi surface…

We report density functional calculations of the electronic structure, Fermi surface, phonon spectrum, magnetism and electron-phonon coupling for the superconducting phase FeSe, as well as the related compounds FeS and FeTe. We find that…

Superconductivity · Physics 2008-10-14 Alaska Subedi , Lijun Zhang , David J. Singh , Mao-Hua Du

We review a variety of theoretical and experimental results concerning electronic band structure of superconducting materials based on FeSe monolayers. Three type of systems are analyzed: intercalated FeSe systems A_xFe_2Se_{2-x}S_x and…

Superconductivity · Physics 2017-02-20 I. A. Nekrasov , N. S. Pavlov , M. V. Sadovskii , A. A. Slobodchikov

In this article, we report the occurrence of superconductivity in Sn0.4Sb0.6 single crystal at below 4K. Rietveld refined Powder XRD data confirms the phase purity of as grown crystal, crystallizing in rhombohedral R-3m space group with an…

Superconductivity · Physics 2020-06-23 M. M. Sharma , Kapil Kumar , Lina Sang , X. L. Wang , V. P. S. Awana

We have performed an angle-resolved photoemission spectroscopy study of a new iron-based superconductor Sr4V2O6Fe2As2. While V 3d orbitals are found to be in a Mott insulator state and show an incoherent peak at ~ 1 eV below the Fermi…

There has been a long-standing debate about the mechanism of the unusual superconductivity in alkali-intercalated fulleride superconductors. In this work, using high-resolution angle-resolved photoemission spectroscopy, we systematically…

We have performed high-resolution angle-resolved photoemission spectroscopy of iron-chalcogenide superconductor Fe1.03Te0.7Se0.3 (Tc = 13 K) to investigate the electronic structure relevant to superconductivity. We observed a hole- and an…

Superconductivity · Physics 2011-08-24 K. Nakayama , T. Sato , P. Richard , T. Kawahara , Y. Sekiba , T. Qian , G. F. Chen , J. L. Luo , N. L. Wang , H. Ding , T. Takahashi

First principles FLAPW-GGA method was used for the comparative study of the structural and electronic properties of three related tetragonal ThCr2Si2-type phases KFe2Ch2, where Ch are S, Se, and Te. The main trends in electronic bands,…

Superconductivity · Physics 2011-02-23 I. R. Shein , A. L. Ivanovskii

Single-layer FeSe film on SrTiO3(001) was recently found to be the champion of interfacial superconducting systems, with a much enhanced superconductivity than the bulk iron-based superconductors. Its superconducting mechanism is of great…

Superconductivity · Physics 2016-02-09 Q. Fan , W. H. Zhang , X. Liu , Y. J. Yan , M. Q. Ren , R. Peng , H. C. Xu , B. P. Xie , J. P. Hu , T. Zhang , D. L. Feng

SrPt2As2 is a novel arsenide superconductor, which crystallizes in the CaBe2Ge2-type structure as a different polymorphic form of the ThCr2Si2-type structure. SrPt2As2 exhibits a charge-density-wave (CDW) ordering at about 470 K and enters…

Superconductivity · Physics 2010-12-14 Kazutaka Kudo , Yoshihiro Nishikubo , Minoru Nohara

We report LDA calculated band structure, densities of states and Fermi surfaces for recently discovered Pt-pnictide superconductors APt3P (A=Ca,Sr,La), confirming their multiple band nature. Electronic structure is essentially three…

Superconductivity · Physics 2015-03-20 I. A. Nekrasov , M. V. Sadovskii

We show that electronic Raman scattering affords a window into the essential properties of the pairing potential $V_{\mathbf{k},\mathbf{k^{\prime}}}$ of iron-based superconductors. In Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ we observe band…

Superconductors based on transition metal dichalcogenides are of substantial current relevance, towards attaining topological superconductivity. Here we report a detailed study on the synthesis and electromagnetic characterization of…

Superconductivity · Physics 2023-08-11 K. Yadav , M. Lamba , M. Singh , A. Kumar , S. Patnaik

The electronic structure of the natural topological semimetal Co$_3$Sn$_2$S$_2$ crystals was studied using near-edge x-ray absorption spectroscopy (NEXAFS) and resonant photoelectron spectroscopy (ResPES). Although, the significant increase…

In the iron based superconductors, one of the on-going frontier studies is about the pairing mechanism. The recent interest concerns the high temperature superconductivity and its intimate reason in the monolayer FeSe thin films. The…

Superconductivity · Physics 2016-02-02 Zengyi Du , Xiong Yang , Hai Lin , Delong Fang , Guan Du , Jie Xing , Huan Yang , Xiyu Zhu , Hai-Hu Wen
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