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Superconducting gap evolution of kagome metal CsV3Sb5 under pressure

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Science China(Physics,Mechanics & Astronomy) 2023年第2期66卷 109-114页

作者： Dongting Zhang Chufan Chen Lichang Yin Yan'En Huang Fengrui Shi Yi Liu Xiaofeng Xu Huiqiu Yuan Xin Lu Center for Correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China Key Laboratory of Quantum Precision Measurement of Zhejiang Province Department of Applied PhysicsZhejiang University of TechnologyHangzhou310023China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310058China StateKey Laboratory of Silicon Materials Zhejiang UniversityHangzhou 310058China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

Kagome superconductors AV3Sb5(A=Cs,V,Sb) have served as an ideal platform to unveil the intriguing competitions between charge-density-wave(CDW),superconductivity and possible nontrivial topological states.We report soft point-contact spectroscopy(SPCS) studies on CsV3Sb5under pressure up to 2.5 GPa.Its superconducting transition temperature Tcand gaps for SPCS at pressure P=0.1 GPa suggest the absence of the adverse local strain effect as observed in point-contacts at ambient pressure,while the SPCS-determined Tcunder hydrostatic pressure deviates from the reported double dome feature below 2.5 GPa.Three distinct gap values in CsV3Sb5are proposed to exist through the whole pressure range with 2Δ1/kBTc≤1,2Δ2/kBTc~2.3-3.0 and 2Δ3/kBTc>3.5.The two smaller gaps for 2Δ1/kBTc≤1 and 2Δ2/kBTc~2.3-3.0 are robust under pressure,while there is no trace of the largest gap 2Δ3/kBTc>3.5 for SPCS in the c direction with P≤P1=0.7 GPa and P≥ P2=2.0 GPa and it becomes observable in the pressure range of(P1,P2),suggesting a complex relation between CDW and superconductivity between(P1,P2).

关键词： evolution hydrostatic superconductivity

Low-pressure-induced large barocaloric effect in MnAs_(0.94)Sb_(0.06) alloy around room temperature

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Rare Metals 2023年第12期42卷 3977-3984页

作者： Peng-Tao Cheng Zhao Zhang Xu-Cai Kan Cheng-Liang Zhang Zheng-Ming Zhang Bing Li Dun-Hui Wang Division of Microelectronic Materials and Devices Hangzhou Dianzi UniversityHangzhou 310018China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Anhui UniversityHefei 230601China Engineering Technology Research Center of Magnetic Materials School of Physics and Materials ScienceAnhui UniversityHefei 230601China

The barocaloric effect(BCE)is a promising alternative to traditional vapor compressing refrigeration because of its environmentally friendly impact and high energy efficiency.However,the driving hydrostatic pressure for most BCE materials is relatively high,which is not conducive to practical application.In this paper,we report that the large barocaloric entropy change of MnAs_(0.94)Sb_(0.06)alloy can be induced by low hydrostatic pressures.Its phase transition temperature is strongly sensitive to the applied pressure,resulting in a large barocaloric coefficient of 134 K·GPa^(-1)on cooling and 126 K·GPa^(-1)on heating.The maximum barocaloric entropy change and adiabatic temperaturechange resulted from hydrostatic pressure of 40 MPa reach up to 26.3 J·kg^(-1)·K^(-1)and 14.4 K,respectively,showing an excellent barocaloric performance.The results demonstrate that the MnAs_(0.94)Sb_(0.06)alloy is a promising alternative for BCE refrigeration.

关键词： alloy hydrostatic

Suppression of Self-sustained Field Domain Oscillation in GaAs/AlAs Superlattice by hydrostatic Pressure at Room Temperature

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Chinese Physics Letters 1999年第2期16卷 143-145页

作者：武建青刘振兴江德生孙宝权 National Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083 Institute of Physics Chinese Academy of SciencesBeijing 100080

The behavior of room temperature self-sustained current oscillations resulting from sequential resonance tunneling in a doped weakly-coupled GaAs/AlAs superlattice(SL)is investigated under hydrostatic pressure.From atmosphere pressure to 6.5 kbar,oscillations exist in the whole plateau of the I-V curve and oscillating characteristics are affected by the pressure.When hydrostatic pressure is higher than 6.5 kbar,the current oscillations are completely suppressed although a current plateau still can be seen in the 1-V curve.The plateau disappears when the pressure is close to 13.5kbar.As the main effect of hydrostatic pressure is to lower the X point valley with respect to Г point valley,the disappearance of oscillation and the plateau shrinkage before Г-X resonance takes place are attributed to the increases of thermoionic emission and nonresonant tunneling components determined by the lowest Г-X barrier height in GaAs/AlAs SL structure.

关键词： hydrostatic tunneling sustained

Transport properties of topological nodal-line semimetal candidate CaAs_3 under hydrostatic pressure

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Chinese Physics B 2019年第4期28卷 36-40页

作者：李婧赵凌霄王义炎王欣敏麻朝阳朱文亮高默然张帅任治安陈根富 Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences SongShan Lake Materials Laboratory

We report the transport properties of the CaAs_3 single crystal, which has been predicted to be a candidate for topological nodal-line semimetals. At ambient pressure, CaAs_3 exhibits semiconducting behavior with a small gap, while in some crystals containing tiny defects or impurities, a large "hump" in the resistivity is observed around 230 K. By applying hydrostatic pressure, the samples appear to a tendency towards metallic behavior, but not fully metallized up to 2 GPa.Further high pressure studies are needed to explore the topological characteristics for CaAs_3.

关键词： hydrostatic pressure topological material crystal growth

Numerical Analysis of Stresses on Layer-by-Layer Basis in FML Composite Cylinder Subjected to External hydrostatic Loading

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Materials Sciences and Applications 2015年第6期6卷 489-499页

作者： B. G. Sumana H. N. Vidya Sagar K. V. Sharma M. Krishna Research Scholar Department of Mechanical Engineering University Visvesvaraya College of Engineering Bangalore India Department of Mechanical Engineering University Visvesvaraya College of Engineering Bangalore India Department of Mechanical Engineering R V College of Engineering Bangalore India

The aim of the research work was to numerically investigate the residual stresses induced between the layers of fiber metal laminate (FML) cylinder (glass/epoxy reinforced aluminum laminates) under buckling hydrostatic loading. For the analysis of buckling behavior of FML cylinders, various fiber orientations such as 0/90°, 60/30°, ±45° and ±55° and different FRP thickness of 1, 2, and 3 mm were considered. The aluminum cylinder of inner diameter 80 mm, length 800 mm and wall thickness 1 mm was modeled with SHELL281 element type and a total of 1033 elements were used for computing the induced residual stresses between the layers. The results show that magnitude of residual stresses between the layers decreased along the thickness from outer layer towards the inner layer in sine wave form. The maximum residual Von-Mises stress was at inner aluminum layer while the maximum residual radial stress was at the outermost layer of FML cylinder due to the inward pressure. Among all types of FML cylinder 0/90° fiber oriented FML cylinder exhibited the least radial stress and a maximum Von-Mises stress along the FRP thickness.

关键词： FML Cylinder External hydrostatic Loading Residual Stress Von-Mises Stress Radial Stress

Rheological Characterization Bovine Serum Albumin Gels Induced by High hydrostatic Pressure

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Food and Nutrition Sciences 2015年第9期6卷 770-779页

作者： Serena De Maria Giovanna Ferrari Paola Maresca Department of Industrial Engineering University of Salerno Fisciano (SA) Italy ProdAl Scarl Fisciano (SA) Italy

Similarly to heating, non-thermal technologies like High hydrostatic Pressure (HHP) are able to affect the native conformation of proteins, causing denaturation, aggregation or gelation. The aim of this work is to evaluate the effect of product’s chemical-physical characteristics, namely pH and protein concentration, and process parameters, namely pressure level and processing time, on the stability of the structure of a particular allergen, the Bovine Serum Albumin (BSA) as well as to individuate the most appropriate processing conditions to induce protein denaturation and/or aggregation. Different amounts of BSA protein were dissolved in phosphate buffer (50 mM) at three different pH (6, 7 and 8), to obtain concentration levels of 12, 25, 50 and 100 mg/mL. The HHP process was carried out at pressure levels in the range between 700 and 900 MPa and treatment time of 15 - 25 min. The structural characteristics of HHP-treated BSA suspensions were assessed by means of a complete rheological screening (strain sweep, frequency sweep and temperature ramp tests) in dynamic regime. Experimental data demonstrate that the rheological parameters, namely the loss and the storage moduli, increase as pressure levels and processing time increase, especially at higher concentrations, whereas a constant critical strain of about 0.3% is detected. The pH and protein concentration mainly control the denaturation influencing the threshold value of the processing conditions at which the gelation occurs. At processing conditions below the threshold values, however, the structure of BSA can be reversibly damaged.

关键词： High hydrostatic Pressure BSA Rheology

Resistivity of Two Kinds of Amorphous Alloys Under High hydrostatic Pressure

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Chinese Science Bulletin 1994年第8期39卷 622-627页

作者：苏昉何正明文峰卢国荣谢斌 Center of Fundamental Physics University of Science and Technology of ChinaHefei 230026PRC Structure Research LaboratoryUniversity of Science and Technology of ChinaHefei 230026PRC Department of Physics University of Science and Technology of ChinaHefei 230026PRC Center of Fundamental Physics University of Science and Technology of ChinaHefei 230026PRC

Amorphous ferromagnetic alloy has excellent magnetism, and its resistivity is oneor two orders of magnitude higher than that of crystal alloy of the same composition.It is extensively applied in America, Japan, Germany, France etc., since it can beused as the material to make the core in a transformer to reduce the energy loss andenhance the working frequency.

关键词： amorphous alloy resistivity hydrostatic pressure.

EFFECTS OF TECTONIC FORCE ON hydrostatic PRESSURE DURING PETROGENESIS AND METALLOGENESIS

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Geotectonica et Metallogenia 1995年第Z1期19卷 39-47页

作者： Lu Guxian Yin Jicai(Institute of Geomechanics, CAGS, Beijing, 100081, China)

Research on hydrostatic pressure in the crust has been previously conducted from the viewpoint that the hydrostatic pressure is equal to gravity,considering the hydrostatic preessure in the geochemical process of petrogenesis and metallogenesis is mainly derived from the gravity of overlying rocks. This paper suggests that the stress state of any point in the crust is caused by both gravity and tectonic force.The author puts forward a viewpoint that the hydrostatic pressure is a combination or superposition of two isotropic stresses, i. e. tectonic force and gravity, in the stress field. The results obtained by a finite-element simulation indicate that the. additional hydrostatic pressure borne by rocks decreases gradually frotn the compression zone (K), the shear zone to the tensile sone (K) and the difference of the tectonic additional hydrostatic pressure between these deformed zones tends to increase, following the increase in absoIute vaIue and/or difference of external forces in different directions.This study tries to explain the effects of tectonic force on hydrostatic pressure during petrogenesis and metallogenesis,which will lay the foundation for research on tectonic physico-chemistry.

关键词： tectonic deformed zone tectonic additional hydrostatic pressure tectonic physico-chemistry

Measurement and Forecasting of Port Tide hydrostatic Component in North Tyrrhenian Sea (Italy)

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Open Journal of Marine Science 2020年第2期10卷 52-77页

作者： Osvaldo Faggioni Istituto Nazionale di Geofisica e Vulcanologia Via di Vigna Murata Roma Italy Applied Computational Metrology Lab INGV-Università di Genova Via Carducci La Spezia Italy

Starting from the end of the 90s not perodic and unpredictable variations in the depth of harbor waters were observed. Long period (from 24 hours to a few days) and wide amplitude are their main features. Experience showed that this phenomenon is a risk for harbor navigation and mooring. It may be a serious obstacle to waterside port activities. The first observation of the data does not link the super-highs and the super-dry tides to the meteorological dynamic of sea-atmosphere interaction (i.e. Storm Effect). More, the attempt to compensate for these sea depth fluctuations by means of the well-known offshore hydrobarometric inverse parameter (1 [cm] sea level variation for ǃ [hPa] atmospheric pressure variation) underestimates the amplitude of the phenomenon. In the first years of 2000, the Italian Ministry of Transport launched a national project for the definition of thee-amplitude and time of these tidal anomalous waves. The measure of harbors hydrobarometric inverse factors showed a much more intense value than the theoretical one (computed for the offshore). These amplification factors are characteristic of each harbor and can be double (in exceptional cases even more) than offshore. The delay between the arrival times of these tidal waves (induced phenomenon) respect to the time of arrival of the atmospheric pressure variation (inducing phenomenon) depends on 1) morphology of the port basin sea floor and 2) harbor and off-shre water dynamics relationship (first approximation). For these reasons the hydro barometric inverse parameter is not effectiveness computable but it can be determined statistically.

关键词： Coastal and Port Tides hydrostatic Component Gravimetric Measurements Safety of Port Navigation and Docking