V-based kagome superconductors AV_(3)Sb_(5)(A=K,Rb,and Cs)host a charge density wave(CDW)and a topological nontrivial band structure,thereby providing a great platform to study the interplay of superconductivity(SC),C...V-based kagome superconductors AV_(3)Sb_(5)(A=K,Rb,and Cs)host a charge density wave(CDW)and a topological nontrivial band structure,thereby providing a great platform to study the interplay of superconductivity(SC),CDW,frustration,and topology.Here,we report ultralow-temperature thermal conductivity measurements of CsV_(3)Sb_(5 ) and Ta-doped Cs((V_(0.86)Ta_(0.14)))_(3)Sb_(5) and scanning tunneling microscopy(STM)measurements of CsV_(3)Sb_(5 ).The finite residual linear term of thermal conductivity at zero magnetic field suggests the existence of a residual density of states(DOS)in the superconducting state of CsV_(3)Sb_(5 ).This is supported by the observation of non-zero conductance at zero bias in STM spectrum at an electronic temperature of 90 mK.However,in Cs(V_(0.86)Ta_(0.14))_(3)Sb_(5),which does not have CDW order,there is no evidence for the residual DOS.These results show the importance of CDW order for the residual DOS,and that a nodal s-wave gap or residual Fermi arc may be the origin of the residual DOS in such an unusual multiband kagome superconductor,CsV_(3)Sb_(5 ).展开更多
目的分析利用自动痔疮套扎术(ruiyun procedure for hemorrhoid,RPH)治疗轻中度痔疮的治疗中的价值。方法选取2019年1月至2022年3月苏州大学附属张家港医院收治的96例轻中度痔疮患者为研究对象,对其临床资料进行回顾性分析,其中对照组(n...目的分析利用自动痔疮套扎术(ruiyun procedure for hemorrhoid,RPH)治疗轻中度痔疮的治疗中的价值。方法选取2019年1月至2022年3月苏州大学附属张家港医院收治的96例轻中度痔疮患者为研究对象,对其临床资料进行回顾性分析,其中对照组(n=46)患者采取传统手术治疗,观察组(n=50)患者实施RPH治疗,对比两组患者手术指标、术后并发症情况、治疗效果、生活质量以及症状积分。结果观察组患者术后疼痛评分低于对照组,术中出血量少于对照组,愈合时间及手术时间均短于对照组,差异均有显著性(P<0.05)。观察组患者并发症发生率为6.00%,显著低于对照组的23.91%(P<0.05)。观察组患者治疗总有效率为96.00%,明显高于对照组的78.26%(P<0.05)。观察组患者治疗后生活质量各项评分均高于对照组,且干预后症状积分均低于对照组,差异均有显著性(P<0.05)。结论RPH治疗轻中度痔疮患者疗效显著,且并发症较少。展开更多
Topological materials have aroused great interest in recent years,especially when magnetism is involved.Pressure can effectively tune the topological states and possibly induce superconductivity.Here we report the hig...Topological materials have aroused great interest in recent years,especially when magnetism is involved.Pressure can effectively tune the topological states and possibly induce superconductivity.Here we report the high-pressure study of topological semimetals XCd_(2)Sb_(2)(X=Eu and Yb),which have the same crystal structure.In antiferromagnetic(AFM)Weyl semimetal EuCd_(2)Sb_(2),the Néel temperature(TN)increases from 7.4 K at ambient pressure to 50.9 K at 14.9 GPa.When pressure is above 14.9 GPa,the AFM peak of resistance disappears,indicating a non-magnetic state.In paramagnetic Dirac semimetal candidate YbCd_(2)Sb_(2),pressure-induced superconductivity appears at 1.94 GPa,then Tc reaches to a maximum of 1.67 K at 5.22 GPa and drops to zero at about 30 GPa,displaying a dome-shaped temperature–pressure phase diagram.High-pressure x-ray diffraction measurement demonstrates that a crystalline-to-amorphous phase transition occurs at about 16 GPa in YbCd_(2)Sb_(2),revealing the robustness of pressure-induced superconductivity against structural instability.Similar structural phase transition may also occur in EuCd_(2)Sb_(2),causing the disappearance of magnetism.Our results show that XCd_(2)Sb_(2)(X=Eu and Yb)is a novel platform for exploring the interplay among magnetism,topology,and superconductivity.展开更多
文摘V-based kagome superconductors AV_(3)Sb_(5)(A=K,Rb,and Cs)host a charge density wave(CDW)and a topological nontrivial band structure,thereby providing a great platform to study the interplay of superconductivity(SC),CDW,frustration,and topology.Here,we report ultralow-temperature thermal conductivity measurements of CsV_(3)Sb_(5 ) and Ta-doped Cs((V_(0.86)Ta_(0.14)))_(3)Sb_(5) and scanning tunneling microscopy(STM)measurements of CsV_(3)Sb_(5 ).The finite residual linear term of thermal conductivity at zero magnetic field suggests the existence of a residual density of states(DOS)in the superconducting state of CsV_(3)Sb_(5 ).This is supported by the observation of non-zero conductance at zero bias in STM spectrum at an electronic temperature of 90 mK.However,in Cs(V_(0.86)Ta_(0.14))_(3)Sb_(5),which does not have CDW order,there is no evidence for the residual DOS.These results show the importance of CDW order for the residual DOS,and that a nodal s-wave gap or residual Fermi arc may be the origin of the residual DOS in such an unusual multiband kagome superconductor,CsV_(3)Sb_(5 ).
文摘目的分析利用自动痔疮套扎术(ruiyun procedure for hemorrhoid,RPH)治疗轻中度痔疮的治疗中的价值。方法选取2019年1月至2022年3月苏州大学附属张家港医院收治的96例轻中度痔疮患者为研究对象,对其临床资料进行回顾性分析,其中对照组(n=46)患者采取传统手术治疗,观察组(n=50)患者实施RPH治疗,对比两组患者手术指标、术后并发症情况、治疗效果、生活质量以及症状积分。结果观察组患者术后疼痛评分低于对照组,术中出血量少于对照组,愈合时间及手术时间均短于对照组,差异均有显著性(P<0.05)。观察组患者并发症发生率为6.00%,显著低于对照组的23.91%(P<0.05)。观察组患者治疗总有效率为96.00%,明显高于对照组的78.26%(P<0.05)。观察组患者治疗后生活质量各项评分均高于对照组,且干预后症状积分均低于对照组,差异均有显著性(P<0.05)。结论RPH治疗轻中度痔疮患者疗效显著,且并发症较少。
基金the National Natural Science Foundation of China(Grant No.12174064)the Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01)the research fund from the State Key Laboratory of Surface Physics and Department of Physics,Fudan University(Grant No.KF202009)。
文摘Topological materials have aroused great interest in recent years,especially when magnetism is involved.Pressure can effectively tune the topological states and possibly induce superconductivity.Here we report the high-pressure study of topological semimetals XCd_(2)Sb_(2)(X=Eu and Yb),which have the same crystal structure.In antiferromagnetic(AFM)Weyl semimetal EuCd_(2)Sb_(2),the Néel temperature(TN)increases from 7.4 K at ambient pressure to 50.9 K at 14.9 GPa.When pressure is above 14.9 GPa,the AFM peak of resistance disappears,indicating a non-magnetic state.In paramagnetic Dirac semimetal candidate YbCd_(2)Sb_(2),pressure-induced superconductivity appears at 1.94 GPa,then Tc reaches to a maximum of 1.67 K at 5.22 GPa and drops to zero at about 30 GPa,displaying a dome-shaped temperature–pressure phase diagram.High-pressure x-ray diffraction measurement demonstrates that a crystalline-to-amorphous phase transition occurs at about 16 GPa in YbCd_(2)Sb_(2),revealing the robustness of pressure-induced superconductivity against structural instability.Similar structural phase transition may also occur in EuCd_(2)Sb_(2),causing the disappearance of magnetism.Our results show that XCd_(2)Sb_(2)(X=Eu and Yb)is a novel platform for exploring the interplay among magnetism,topology,and superconductivity.
