|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Nodeless superconductivity in the kagome metal CsV_(3)Sb_(5)显示文摘The recently discovered kagome metal series AV3Sb5(A=K, Rb, Cs) exhibits topologically nontrivial band structures, chiral charge order and superconductivity, presenting a unique platform for realizing exotic electronic states. The nature of the superconducting state and the corresponding pairing symmetry are key questions that demand experimental clarification. Here, using a technique based on the tunneling diode oscillator, the magnetic penetration depth ?λ(T) of CsV3Sb5 was measured down to 0.07 K. A clear exponential behavior in ?λ(T) with marked deviations from a T or T2 temperature dependence was observed at low temperatures, indicating an absence of nodal quasiparticles. Temperature dependence of the superfiuid density and electronic specific heat can be described by two-gap s-wave superconductivity, consistent with the presence of multiple Fermi surfaces in CsV3Sb5. These results evidence nodeless superconductivity in CsV3Sb5 under ambient pressure, and constrain the allowed pairing symmetry. | Weiyin Duan Zhiyong Nie Shuaishuai Luo Fanghang Yu Brenden R.Ortiz Lichang Yin Hang Su Feng Du An Wang Ye Chen Xin Lu Jianjun Ying Stephen DWilson Xianhui Chen Yu Song Huiqiu Yuan | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，10： | 3 |
| 2 | Superconducting gap evolution of kagome metal CsV3Sb5 under pressure显示文摘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). | Dongting Zhang Chufan Chen Lichang Yin Yan'En Huang Fengrui Shi Yi Liu Xiaofeng Xu Huiqiu Yuan Xin Lu | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，2： | 2 |
| 3 | CaPtAs: A new noncentrosymmetric superconductor显示文摘We report the discovery of a new noncentrosymmetric superconductor CaPtAs.It crystallizes in a tetragonal structure(space group I41md,No.109),featuring three dimensional honeycomb networks of Pt-As and a much elongated c-axis(a=b=4.18?,and c=43.70?).The superconductivity of CaPtAs with Tc=1.47 K was characterized by means of electrical resistivity,specific heat,and ac magnetic susceptibility.The electronic specific heat Ce(T)/T shows evidence for a deviation from the behavior of a conventional BCS superconductor,and can be reasonably fitted by a p-wave model.The upper critical fieldμ0Hc2 of CaPtAs exhibits a moderate anisotropy,with an in-plane value of around 204 mT and an out-of-plane value of 148 mT.Density functional theory calculations indicate that the Pt-5 d and As-4 p orbitals mainly contribute to the density of states near the Fermi level,showing that the Pt-As honeycomb networks may significantly influence the superconducting properties. | Wu Xie PeiRan Zhang Bin Shen WenBing Jiang GuiMing Pang Tian Shang Chao Cao Michael Smidman HuiQiu Yuan | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，3： | 1 |
| 4 | Point-defect properties in HCP rare earth metals with analytic modified embedded atom potentials显示文摘 | Wangyu Hu Huiqiu Deng Xiaojian Yuan Masahiro Fukumoto | 2003 | The European Physical Journal B2003，，4： | 1 |
| 5 | High-temperature superconductivity up to 223 K in the Al stabilized metastable hexagonal lanthanum superhydride显示文摘As compressed hydrides constantly refresh the records of superconducting critical temperatures(T_(c)) in the vicinity of room temperature, this further reinforces the confidence to find more high-temperature superconducting hydrides. In this process, metastable phases of superhydrides offer enough possibilities to access superior superconducting properties. Here we report a metastable hexagonal lanthanum superhydride(P6_(3)/mmc-LaH_(10)) stabilized at 146 GPa by introducing an appropriate proportion of Al,which exhibits high-temperature superconductivity with T_(c)~178 K, and this value is enhanced to a maximum T_(c)~223 K at 164 GPa. A huge upper critical magnetic field value H_(c2)(0) reaches 223 T at 146 GPa. The small volume expansion of P63/mmc-(La, Al) H_(10) compared with the binary La H_(10) indicates the possible interstitial sites of Al atoms filling into the La–H lattice, instead of forming conventional ternary alloy-based superhydrides. This work provides a new strategy for metastable high-temperature superconductors through the multiple-element system. | Su Chen Yingcai Qian Xiaoli Huang Wuhao Chen Jianning Guo Kexin Zhang Jinglei Zhang Huiqiu Yuan Tian Cui | 2024 | National Science Review2024，11，1： | 0 |
| 6 | Structural and magnetic properties of CeZnAl3 single crystals显示文摘We have synthesized single crystals of CeZnAl_3,which is a new member of family of Ce-based intermetallics CeTX_3(T=transition metal, X=Si, Ge, Al), crystallizing in the non-centrosymmetric tetragonal BaNiSn_3-type structure. Magnetization,specific heat and resistivity measurements all show that CeZnAl_3 orders magnetically below around 4.4 K. Furthermore,magnetization measurements exhibit a hysteresis loop at low temperatures and fields, indicating the presence of a ferromagnetic component in the magnetic state. This points to a different nature of the magnetism in CeZnAl_3 compared to the other isostructural CeTAl_3 compounds. Resistivity measurements under pressures up to 1.8 GPa show a moderate suppression of the ordering temperature with pressure, suggesting that measurements to higher pressures are required to look for quantum critical behavior. | Qian Liu Bin Shen Michael Smidman Rui Li ZhiYong Nie XiaoYan Xiao Ye Chen Hanoh Lee HuiQiu Yuan | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，7： | 0 |
| 7 | Preface to the topical issue显示文摘Transition metals contain d-orbital electrons,and compounds based on transition metals often exhibit a duality of magnetism and superconductivity.To date,a large number of interesting physics phenomena exhibited by transition-metal compounds have been discovered;for example,high-temperature superconductivity has been found to emerge in compounds such as copper-oxide (cuprate)compounds,iron pnictides/chalcogenides.Understanding the relationship between superconductivity and magnetism is essential for realizing these unconventional superconductors. | Hai-Hu Wen HuiQiu Yuan ShiPing Feng | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，12： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员