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Based on first principle calculations we have investigated the evolution of magnetism in free-standing monolayer FeSe with respect to lattice constant and magnetism in bulk FeSe. The computational results show that the magnetic order in…

Superconductivity · Physics 2015-10-20 Shuai Wang , Fa Wang

For electrical spin injection and detection of spin-polarized electrons in silicon, we explore highly epitaxial growth of ferromagnetic full-Heusler-alloy Co2FeSi thin films on silicon substrates using low-temperature molecular beam epitaxy…

Materials Science · Physics 2015-05-13 S. Yamada , K. Yamamoto , K. Ueda , Y. Ando , K. Hamaya , T. Sadoh , M. Miyao

Electronically driven nematic order is often considered as an essential ingredient of high-temperature superconductivity. Its elusive nature in iron-based supercon- ductors resulted in a controversy not only as regards its origin but also…

We provide a band structure with low-energy properties consistent with recent photoemission and quantum oscillations measurements on FeSe, assuming mean-field like s and/or d-wave orbital ordering at the structural transition. We show how…

Superconductivity · Physics 2015-07-27 Shantanu Mukherjee , A. Kreisel , P. J. Hirschfeld , Brian M. Andersen

A distinct electronic structure was observed in the single-layer FeSe which shows surprising high temperature superconductivity over 65k. Here we demonstrate that the electronic structure can be explained by the strain effect due to…

Superconductivity · Physics 2014-09-29 Ningning Hao , Jiangping Hu

We present a finite-temperature density functional theory investigation of the nonequilibrium transient electronic structure of warm dense Li, Al, Cu, and Au created by laser excitation. Photons excite electrons either from the inner shell…

Atomic Physics · Physics 2021-02-26 Hengyu Zhang , Shen Zhang , Dongdong Kang , Jiayu Dai , M. Bonitz

The interactions between electrons and phonons drive a large array of technologically relevant material properties including ferroelectricity, thermoelectricity, and phase-change behaviour. In the case of many group IV-VI, V, and related…

The strong fascination exerted by the binary compound of FeSe demands reliable engineering protocols and more effective approaches towards inducing superconductivity in FeSe thin films. Our study addresses the peculiarities in pulsed laser…

The electronic structure and the magnetism of the novel ferromagnetic semiconductor (Ga,Fe)Sb, whose Curie temperature $T_{\rm C}$ can exceed room temperature, were investigated by means of x-ray absorption spectroscopy (XAS), x-ray…

The films of FeSe on substrates have attracted attention because of their unusually high-temperature (Tc) superconducting properties whose origins continue to be debated. To disentangle the competing effects of the substrate and interlayer…

Superconductivity · Physics 2023-02-21 Jia Shi , Duy Le , Volodymyr Turkowski , Naseem Ud Din , Tao Jiang , Qiang Gu , Talat S. Rahman

We show that, upon the chemisorption of organic molecules, Co thin films display a number of unique magnetic properties, including the giant magnetic hardening and the violation of the Rayleigh law in magnetization reversal. These novel…

Magnetization and magnetic microstructure of top soft magnetic layer (Fe), which is exchange spring coupled to bottom hard magnetic layer ($L1_0$ FePt) is studied using high resolution Kerr microscopy. When the sample (FePt/Fe) is at…

Materials Science · Physics 2021-12-06 Zaineb Hussain , Dileep Kumar , V. Raghavendra Reddy , Ajay Gupta

Despite decades of research in spatially confined superconducting systems to understand the modification of superconductivity from reduced length scales, the investigation of the quantum confinement effect on high-temperature…

Superconductivity · Physics 2024-07-08 Guanyang He , Yu Li , Yuxuan Lei , Andreas Kreisel , Brian M. Andersen , Jian Wang

The electronic structures of the Heusler type compounds Fe$_{3-x}V$_x$Si in the concentration range between x = 0 and x = 1 have been probed by photoemission spectroscopy (PES). The observed shift of Si 2p core- level and the main valence…

Local structure of FeSe(1-x)Te(x) has been studied by extended x-ray absorption fine-structure (EXAFS) measurements as a function of temperature. Combination of Se and Fe K edge EXAFS has permitted to quantify the local interatomic…

Superconductivity · Physics 2010-08-03 B. Joseph , A. Iadecola , A. Puri , L. Simonelli , Y. Mizuguchi , Y. Takano , N. L. Saini

Two-dimensional (2D) magnets exhibit unique physical properties for potential applications in spintronics. To date, most 2D ferromagnets are obtained by mechanical exfoliation of bulk materials with van der Waals interlayer interactions,…

Metal monochalcogenide GaSe is a classic layered semiconductor that has received increasing research interest due to its highly tunable electronic and optical properties for ultrathin electronics applications. Despite intense research…

Materials Science · Physics 2024-05-14 Fanhao Jia , Zhao Tang , Greis J. Cruz , Weiwei Gao , Shaowen Xu , Wei Ren , Peihong Zhang

Recent observation of $\sim$ 10 times higher critical temperature in FeSe monolayer compared with its bulk phase has drawn a great deal of attention because the electronic structure in the monolayer phase appears to be different than bulk…

Superconductivity · Physics 2017-08-16 Subhasish Mandal , Peng Zhang , Sohrab Ismail-Beigi , K. Haule

A deep understanding of molecular photo-transformations is challenging because of the complex interaction between the configurations of electrons and nuclei. An initial optical excitation dissipates energy into electronic and structural…

Fe-doped III-V ferromagnetic semiconductor (FMS) (In,Fe)Sb is a promising material for spintronic device applications because of the n-type carrier conduction and the ferromagnetism with high Curie temperature (TC > 300 K). To clarify the…