Feng Peng

Luoyang Normal University

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Yanming Ma

Jilin University

Chris J. Pickard

Advanced Institute of Materials Science

R. J. Needs

Cavendish Hospital

Hongzhi Fu

Luoyang Normal University

Ying Sun

Tianjin Normal University

Yuhua Wang

Lanzhou University

Hanyu Liu

Jilin University

Tao Gao

Sichuan University

Haijie Guo

Taiyuan University of Technology

Qiang Wu

Guangxi University

Cooperative Institutions

Chinese Academy of Sciences

Luoyang Normal University

Jilin University

Sichuan University

University of Chinese Academy of Sciences

Merck & Co., Inc., Rahway, NJ, USA (United States)

State Key Laboratory of Superhard Materials

University of Science and Technology of China

Lanzhou University

Tsinghua University

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Ab initio calculations of elastic constants and thermodynamic properties of NiAl under high pressures

Computational Materials Science (2008)

Hongzhi Fu Dehua Li Feng Peng Tao Gao Xinlu Cheng

Debye model

10.1016/j.commatsci.2008.05.026

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Citations (376)

Superconductivity in compressed ternary alkaline boron hydrides

Physical review. B./Physical review. B (2022)

Simin Li Hai Yan Wang Weiguo Sun Cheng Lü Feng Peng

Recently, the carbonaceous sulfur hydride was synthesized [E. Snider et al., Nature (London) 586, 373 (2020)], and the measured superconducting transition temperature (${T}_{c}$) is about 278 K under 267 GPa, placing it as a promising candidate of the room temperature superconductor. However, the ultrahigh synthesis pressure is indeed a challenge for experimental technique, stimulating us to search other high temperature superconductors under relatively low pressure. Here we perform comprehensively structural searches of ternary alkaline (Am) boron hydrides. Our calculations indicate that the ternary ${\mathrm{AmB}}_{2}{\mathrm{H}}_{8}$ hydrides are energetically stable at about 10 GPa. Interestingly, the metallic $\mathrm{Rb}/{\mathrm{CsB}}_{2}{\mathrm{H}}_{8}$ polyhydrides are superior superconductors with high ${T}_{c}$ of $\ensuremath{\sim}100$ K at 25 GPa. The electron-phonon coupling calculations suggest that the Am atoms are promising electron contributors, which effectively improve the ${T}_{c}$ and decrease the synthesized pressure in complex hydrides. These findings elucidate the superconductivity mechanism of ${\mathrm{AmB}}_{2}{\mathrm{H}}_{8}$ hydrides and offer crucial insights for design and synthesis of novel superconductors.

10.1103/physrevb.105.224107

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Citations (44)

Photon‐Mediated Phonon Heat Current Between Distant Graphene Sheets Inserted Into a Cavity

physica status solidi (b) (2018)

Feng Peng

In this work, a mechanism of achieving phonon heat current between distant graphene sheets inserted into a cavity with two reflectors at different temperatures are presented. The photon‐mediated pseudospin interaction between two graphene sheets and electron–phonon interaction in each graphene sheet lead to the generation of this phonon heat current. We calculate the phonon heat current, thermal conductivity, and current–current correlation functions between distant graphene sheets. This phonon heat current can be manipulated by the energy flow density and frequency of photons. The giant heat current and thermal conductivity of phonons induced by intense photon field indicate that this mechanism has potential applications on the chip cooling, and far‐range heat transfer.

Heat current

Photon energy

10.1002/pssb.201800321

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Hydrogen Clathrate Structures in Rare Earth Hydrides at High Pressures: Possible Route to Room-Temperature Superconductivity

Physical Review Letters (2017)

Feng Peng Ying Sun Chris J. Pickard R. J. Needs Qiang Wu

Room-temperature superconductivity has been a long-held dream and an area of intensive research. Recent experimental findings of superconductivity at 200 K in highly compressed hydrogen (H) sulfides have demonstrated the potential for achieving room-temperature superconductivity in compressed H-rich materials. We report first-principles structure searches for stable H-rich clathrate structures in rare earth hydrides at high pressures. The peculiarity of these structures lies in the emergence of unusual H cages with stoichiometries H_{24}, H_{29}, and H_{32}, in which H atoms are weakly covalently bonded to one another, with rare earth atoms occupying the centers of the cages. We have found that high-temperature superconductivity is closely associated with H clathrate structures, with large H-derived electronic densities of states at the Fermi level and strong electron-phonon coupling related to the stretching and rocking motions of H atoms within the cages. Strikingly, a yttrium (Y) H_{32} clathrate structure of stoichiometry YH_{10} is predicted to be a potential room-temperature superconductor with an estimated T_{c} of up to 303 K at 400 GPa, as derived by direct solution of the Eliashberg equation.

Clathrate hydrate

Stoichiometry

Room-temperature superconductor

10.1103/physrevlett.119.107001

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Citations (765)

CSD 2124487: Experimental Crystal Structure Determination

The Cambridge Structural Database (2017)

Feng Peng Ying Sun Chris J. Pickard R. J. Needs Qiang Wu

An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the joint CCDC and FIZ Karlsruhe Access Structures service and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.25505/fiz.icsd.cc299pv5

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Generalized functional-integral approach to time evolution of a coupled photon system

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics (1997)

Feng Peng

A generalized functional-integral approach is presented to describe the coupled photon system in a free-electron laser. By establishing the different complex time paths to two subsystems, the Wiggler field and the laser field, an effective action of the system is introduced. A general photon distribution function is obtained by evaluating the functional integral for the generating function.

Wiggler

Time evolution

10.1103/physreve.56.2663

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Citations (9)

CSD 2124494: Experimental Crystal Structure Determination

The Cambridge Structural Database (2017)

Feng Peng Ying Sun Chris J. Pickard R. J. Needs Qiang Wu

Crystal (programming language)

10.25505/fiz.icsd.cc299q2f

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CSD 2124474: Experimental Crystal Structure Determination

The Cambridge Structural Database (2017)

Feng Peng Ying Sun Chris J. Pickard R. J. Needs Qiang Wu

10.25505/fiz.icsd.cc299pfr

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Mechanical Regulation of the Magnetic Properties of Uniaxial Anisotropic Hexaferrite Thin Films

Physical Review Applied (2021)

Qishan Zhu Rujun Tang Feng Peng Sichen Xu Guoqing Liang

Flexible oxide thin films with uniaxial magnetocrystalline anisotropy $({K}_{u})$ not only have many applications in flexible electronics, but also provide an ideal low-crystal-symmetry material for a fundamental understanding of the competitive interplay among magnetocrystalline anisotropy, shape anisotropy, and stress anisotropy. However, an understanding of the mechanical tuning of magnetic parameters in flexible oxide films with ${K}_{u}$ has not been realized up to now. In this work, epitaxial flexible hexaferrite ${\mathrm{Ba}\mathrm{Fe}}_{12}{\mathrm{O}}_{19}$ thin films with a room temperature out-of-plane ${K}_{u}$ of 1.1 \ifmmode\times\else\texttimes\fi{} ${10}^{5}$ J/m${}^{3}$ are fabricated. The continuous and controllable tuning of magnetic parameters is found to be realizable by different bending radii of the film. The changes in magnetic parameters are symmetrical under tensile and compressive bending due to the dominance of film geometry and bending-stress directions, which are perpendicular to the easy axis of ${K}_{u}$. The micromagnetic simulations further show that the magnitude of ${K}_{u}$ plays a critical role in the mechanical tuning performance of the film, where high ${K}_{u}$ drastically reduces the role of stress anisotropy and increases the magnetic bending repeatability of the film by suppressing bending-defect-related anisotropy degradation. This work not only provides an understanding of the role of the direction and magnitude of ${K}_{u}$ in the flexible thin films, but also demonstrates that the flexible hexaferrite film is one of the best materials for mechanical tunable devices up to the millimeter-wave region.

Magnetocrystalline anisotropy

10.1103/physrevapplied.16.054006

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Citations (9)

First-principles calculations on structure and elasticity of wurtzite-type indium nitride under pressure

Journal of Alloys and Compounds (2008)

Feng Peng Yunxia Han Hongzhi Fu Yang Xiang-Dong

Pseudopotential

Wurtzite crystal structure

Indium nitride

Debye model

Shear modulus

Elasticity

Poisson's ratio

10.1016/j.jallcom.2008.08.018

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Citations (10)