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Chinese Physics Letters

Resumen/Descripción – provisto por la editorial en inglés
Chinese Physics Letters, published by the Chinese Physical Society, is charged with providing rapid publication of short reports and important research in all fields of physics. The journal provides its diverse readership with coverage of major advances in all aspects of physics, including the newest and most important achievements of physicists in China as well as other parts of the world.
Palabras clave – provistas por la editorial

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Institución detectada Período Navegá Descargá Solicitá
No detectada desde ago. 1984 / hasta dic. 2023 IOPScience

Información

Tipo de recurso:

revistas

ISSN impreso

0256-307X

ISSN electrónico

1741-3540

País de edición

China

Fecha de publicación

Cobertura temática

Tabla de contenidos

A New Cu-Based Metallic Glass Composite with Excellent Mechanical Properties*

Dong-Mei Li; Lan-Sheng Chen; Peng Yu; Ding Ding; Lei Xia

<jats:p>A new Cu-based bulk metallic glass composite of nominal composition (at.%) Cu<jats:sub>41</jats:sub>Ni<jats:sub>27</jats:sub>Ti<jats:sub>25</jats:sub>Al<jats:sub>7</jats:sub> with excellent plasticity and a strong work-hardening behavior is fabricated. Strength above 1859 MPa and plasticity more than 11% are achieved under compression and tension modes. The deformation mechanism is proposed to the structural heterogeneities of the composite that promotes multiple shear bands meanwhile inhibits their free propagation, which results in the macroscopically plastic strain and work hardening. The alloy contains relatively cheap metals and has a low cost, which is beneficial to industrial applications.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 086401

de Haas-van Alphen Quantum Oscillations in BaSn3 Superconductor with Multiple Dirac Fermions*

Gaoning Zhang; Xianbiao Shi; Xiaolei Liu; Wei Xia; Hao Su; Leiming Chen; Xia Wang; Na Yu; Zhiqiang Zou; Weiwei Zhao; Yanfeng Guo

<jats:p>Characterization of Fermi surface of the BaSn<jats:sub>3</jats:sub> superconductor (<jats:italic>T</jats:italic> <jats:sub>c</jats:sub> ∼ 4.4 K) by de Haas–van Alphen (dHvA) effect measurement reveals its non-trivial topological properties. Analysis of non-zero Berry phase is supported by the <jats:italic>ab initio</jats:italic> calculations, which reveals a type-II Dirac point setting and tilting along the high symmetric <jats:italic>K</jats:italic>–<jats:italic>H</jats:italic> line of the Brillouin zone, about 0.13 eV above the Fermi level, and other two type-I Dirac points on the high symmetric <jats:italic>Γ</jats:italic>–<jats:italic>A</jats:italic> direction, but slightly far below the Fermi level. The results demonstrate BaSn<jats:sub>3</jats:sub> as an excellent example hosting multiple Dirac fermions and an outstanding platform for studying the interplay between nontrivial topological states and superconductivity.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087101

Experimental Observation of Electronic Structures of Kagome Metal YCr6Ge6*

Pengdong Wang; Yihao Wang; Bo Zhang; Yuliang Li; Sheng Wang; Yunbo Wu; Hongen Zhu; Yi Liu; Guobin Zhang; Dayong Liu; Yimin Xiong; Zhe Sun

<jats:p>Using angle-resolved photoemission spectroscopy, we study electronic structures of a Kagome metal YCr<jats:sub>6</jats:sub>Ge<jats:sub>6</jats:sub>. Band dispersions along <jats:italic>k<jats:sub>z</jats:sub> </jats:italic> direction are significant, suggesting a remarkable interlayer coupling between neighboring Kagome planes. Comparing ARPES data with first-principles calculations, we find a moderate electron correlation in this material, since band calculations must be compressed in the energy scale to reach an excellent agreement between experimental data and theoretical calculations. Moreover, as indicated by band calculations, there is a flat band in the vicinity of the Fermi level at the <jats:italic>Γ</jats:italic>–<jats:italic>M</jats:italic>–<jats:italic>K</jats:italic> plane in the momentum space, which could be responsible for the unusual transport behavior in YCr<jats:sub>6</jats:sub>Ge<jats:sub>6</jats:sub>.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087102

Type-II Dirac Semimetal State in a Superconductor Tantalum Carbide*

Zhihai Cui; Yuting Qian; Wei Zhang; Hongming Weng; Zhong Fang

<jats:p>The exploration of topological Dirac semimetals with intrinsic superconductivity can be a most plausible way to discover topological superconductors. We propose that type-II Dirac semimetal states exist in the band structure of TaC, a well-known s-wave superconductor, by using the first-principles calculations and the <jats:italic> <jats:bold>k</jats:bold> </jats:italic> ⋅ <jats:italic> <jats:bold>p</jats:bold> </jats:italic> effective model. The tilted gapless Dirac cones, which are composed of Ta <jats:italic>d</jats:italic> and C <jats:italic>p</jats:italic> orbitals and are protected by <jats:italic>C</jats:italic> <jats:sub>4<jats:italic>v</jats:italic> </jats:sub> symmetry, are found to be below the Fermi level. The bands from Ta <jats:italic>d</jats:italic> orbitals are greatly coupled with the acoustic modes around the zone boundary, indicating their significant contribution to the superconductivity. The relatively high transition temperature ∼10.5 K is estimated to be consistent with the experimental data. To bring the type-II Dirac points close to chemical potential, hole doping is needed. This seems to decrease the transition temperature a lot, making the realization of topological superconductivity impossible.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087103

Symmetry-Assisted Protection and Compensation of Hidden Spin Polarization in Centrosymmetric Systems

Yingjie Zhang; Pengfei Liu; Hongyi Sun; Shixuan Zhao; Hu Xu; Qihang Liu

<jats:p>It was recently noted that in certain nonmagnetic centrosymmetric compounds, spin–orbit interactions couple each local sector that lacks inversion symmetry, leading to visible spin polarization effects in the real space, dubbed “hidden spin polarization (HSP)". However, observable spin polarization of a given local sector suffers interference from its inversion partner, impeding material realization and potential applications of HSP. Starting from a single-orbital tight-binding model, we propose a nontrivial way to obtain strong sector-projected spin texture through the vanishing hybridization between inversion partners protected by nonsymmorphic symmetry. The HSP effect is generally compensated by inversion partners near the <jats:italic>Γ</jats:italic> point but immune from the hopping effect around the boundary of the Brillouin zone. We further summarize 17 layer groups that support such symmetry-assisted HSP and identify hundreds of quasi-2D materials from the existing databases by first-principle calculations, among which a group of rare-earth compounds LnIO (Ln = Pr, Nd, Ho, Tm, and Lu) serves as great candidates showing strong Rashba- and Dresselhaus-type HSP. Our findings expand the material pool for potential spintronic applications and shed light on controlling HSP properties for emergent quantum phenomena.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087105

Structure-Spin-Transport Anomaly in Quasi-One-Dimensional Ba9Fe3Te15 under High Pressure

Jun Zhang; Mei-Ling Jin; Xiang Li; Xian-Cheng Wang; Jian-Fa Zhao; Ying Liu; Lei Duan; Wen-Min Li; Li-Peng Cao; Bi-Juan Chen; Li-Juan Wang; Fei Sun; Yong-Gang Wang; Liu-Xiang Yang; Yu-Ming Xiao; Zheng Deng; Shao-Min Feng; Chang-Qing Jin; Jin-Long Zhu

<jats:p>Recently, a series of novel compounds Ba<jats:sub>3</jats:sub>MX<jats:sub>5</jats:sub> (M = Fe, Ti, V; X = Se, Te) with hexagonal crystal structures composed of quasi-1-dimensional (1D) magnetic chains has been synthesized by our research team using high-pressure and high-temperature methods. The initial hexagonal phases persist to the maximum achievable pressure, while spin configurations and magnetic interactions may change dramatically as a result of considerable reductions in interchain separations upon pressurization. These compounds therefore offer unique possibilities for studying the evolution of intrinsic electronic structures in quasi-1D magnetic systems. Here we present a systematic investigation of Ba<jats:sub>9</jats:sub>Fe<jats:sub>3</jats:sub>Te<jats:sub>15</jats:sub>, in which the interchain separations between trimerized 1D chains (∼ 10.2 Å) can be effectively modulated by external high pressure. The crystal structure especially along the 1D chains exhibits an abnormal expansion at ∼5 GPa, which accompanies trimerization entangled anomalous mixed-high-low spin transition. An insulator-metal transition has been observed under high pressure as a result of charge-transfer gap closing. Pressure-induced superconductivity emerges at 26 GPa, where the charge-transfer gap fully closes, 3D electronic configuration forms and local spin fully collapses.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087106

Magnetization Reversal of Single-Molecular Magnets by a Spin-Polarized Current*

Chao Yang; Zheng-Chuan Wang; Gang Su

<jats:p>We study the magnetization reversal of single-molecular magnets by a spin-polarized current in the framework of the spinor Boltzmann equation. Because of the spin–orbit coupling, the spin-polarized current will impose a non-zero spin transfer torque on the single-molecular magnets, which will induce the magnetization switching of the latter. Via the <jats:italic>s</jats:italic>–<jats:italic>d</jats:italic> exchange interaction between the conducting electrons and single-molecular magnets, we can investigate the magnetization dynamics of single-molecular magnets. We demonstrate the dynamics of the magnetization based on the spin diffusion equation and the Heisenberg-like equation. The results show that when the current is large enough, the magnetization of the single-molecular magnets can be reversed. We also calculate the critical current density required for the magnetization reversal under different anisotropy and external magnetic fields, which is helpful for the corresponding experimental design.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087201

Anisotropy Properties of Mn2P Single Crystals with Antiferromagnetic Transition*

Shi-Hang Na; Wei Wu; Jian-Lin Luo

<jats:p>Single crystals of hexagonal structure Mn<jats:sub>2</jats:sub>P are synthesized by Sn flux for the first time. Transport and magnetic properties have been performed on the single crystals, which is an antiferromagnet with Neel temperature 103 K. Obvious anisotropy of resistivity is observed below the Neel temperature, which is manifested by metallic behavior with a current along the <jats:italic>c</jats:italic>-axis and semiconducting behavior with a current along the <jats:italic>a</jats:italic>-axis. The negative slope of temperature-dependent resistivity is observed above the Neel temperature in both <jats:italic>a</jats:italic> and <jats:italic>c</jats:italic> directions. Strong anisotropy of magnetic susceptibility is also evident from the magnetization measurements. A weak metamagnetic transition is observed only in <jats:italic>a</jats:italic>-axis plane at high magnetic field near 50–60 K compared to the <jats:italic>c</jats:italic>-axis. We believe these strong anisotropies of magnetic and transport properties are due to the anisotropy of spin arrangement. Mn<jats:sub>2</jats:sub>P could be a candidate for exploration of possible superconductivity due to the low spin state.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087301

Electronic Evolution from the Parent Mott Insulator to a Superconductor in Lightly Hole-Doped Bi2Sr2CaCu2O8 + δ*

Qiang Gao; Lin Zhao; Cheng Hu; Hongtao Yan; Hao Chen; Yongqing Cai; Cong Li; Ping Ai; Jing Liu; Jianwei Huang; Hongtao Rong; Chunyao Song; Chaohui Yin; Qingyan Wang; Yuan Huang; Guo-Dong Liu; Zu-Yan Xu; Xing-Jiang Zhou

<jats:p>High temperature superconductivity in cuprates is realized by doping the Mott insulator with charge carriers. A central issue is how such an insulating state can evolve into a conducting or superconducting state when charge carriers are introduced. Here, by <jats:italic>in situ</jats:italic> vacuum annealing and Rb deposition on the Bi<jats:sub>2</jats:sub>Sr<jats:sub>2</jats:sub>Ca<jats:sub>0.6</jats:sub>Dy<jats:sub>0.4</jats:sub>Cu<jats:sub>2</jats:sub>O<jats:sub>8 + <jats:italic>δ</jats:italic> </jats:sub> (Bi2212) sample surface to push its doping level continuously from deeply underdoped (<jats:italic>T</jats:italic> <jats:sub>c</jats:sub> = 25 K, doping level <jats:italic>p</jats:italic> ∼ 0.066) to the near-zero doping parent Mott insulator, angle-resolved photoemission spectroscopy measurements are carried out to observe the detailed electronic structure evolution in the lightly hole-doped region for the first time. Our results indicate that the chemical potential lies at about l eV above the charge transfer band for the parent state at zero doping, which is quite close to the upper Hubbard band. With increasing hole doping, the chemical potential moves continuously towards the charge transfer band and the band structure evolution exhibits a rigid band shift-like behavior. When the chemical potential approaches the charge transfer band at a doping level of ∼0.05, the nodal spectral weight near the Fermi level increases, followed by the emergence of the coherent quasiparticle peak and the insulator–superconductor transition. Our observations provide key insights in understanding the insulator–superconductor transition in doping the parent cuprate compound and for establishing related theories.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087402

A Nonlinear Theoretical Model of Magnetization and Magnetostriction for Ferromagnetic Materials under Applied Stress and Magnetic Fields*

Pengpeng Shi

<jats:p>A thermodynamic and micro-statistical model is proposed to explain the magnetization and magnetostriction mechanisms for isotropic ferromagnetic materials. Here a nonlinear magnetostrictive expression enhances the characterization of the nonlinear magnetic-mechanical effect, and the Brillouin function makes it possible to describe the relationship between the equivalent field and magnetization for various types of materials. Through detailed comparisons with the recent models of Wu <jats:italic>et al.</jats:italic> [<jats:italic>Appl. Phys. Lett.</jats:italic> <jats:bold>115</jats:bold> (2019) 162406] and Daniel [<jats:italic>Eur. Phys. J.: Appl. Phys.</jats:italic> <jats:bold>83</jats:bold> (2018) 30904], it is confirmed that the proposed model can provide greater physical insight and a more accurate description of the complex magnetostriction and magnetization behaviors, especially the complex nonlinearity of stress effects.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 087502