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Tip-induced superconductivity commonly existing in the family of transition-metal dipnictides MPn_(2) 被引量:1
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作者 Meng-Di Zhang Sheng Xu +7 位作者 Xing-Yuan Hou Ya-Dong Gu Fan Zhang Tian-Long Xia Zhi-An Ren Gen-Fu Chen Ning Hao Lei Shan 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第1期14-18,共5页
We report the tip-induced superconductivity on the topological semimetal NbSb_(2), similar to the observation on TaAs_(2) and NbAs_(2). Belonging to the same family of MPn_(2), all these materials possess similar band... We report the tip-induced superconductivity on the topological semimetal NbSb_(2), similar to the observation on TaAs_(2) and NbAs_(2). Belonging to the same family of MPn_(2), all these materials possess similar band structures, indicating that the tip-induced superconductivity may be closely related to their topological nature and share a common mechanism. Further analysis suggests that a bulk band should play the dominant role in such local superconductivity most likely through interface coupling. In addition, the compatibility between the induced superconductivity and tips’ ferromagnetism gives an evidence for its unconventional nature. These results provide further clues to elucidate the mechanism of the tip-induced superconductivity observed in topological materials. 展开更多
关键词 tip-induced superconductivity topological mechanism
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Tip-induced or enhanced superconductivity: a way to detect topological superconductivity 被引量:2
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作者 He Wang Lei Ma Jian wang 《Science Bulletin》 SCIE EI CSCD 2018年第17期1141-1158,共18页
Topological materials, hosting topological nontrivial electronic band, have attracted widespread attentions. As an application of topology in physics, the discovery and study of topological materials not only enrich t... Topological materials, hosting topological nontrivial electronic band, have attracted widespread attentions. As an application of topology in physics, the discovery and study of topological materials not only enrich the existing theoretical framework of physics, but also provide fertile ground for investigations on low energy excitations, such as Weyl fermions and Majorana fermions, which have not been observed yet as fundamental particles. These quasiparticles with exotic physical properties make topological materials the cutting edge of scientific research and a new favorite of high tech. As a typical example, Majorana fermions, predicted to exist in the edge state of topological superconductors, are proposed to implement topological error-tolerant quantum computers. Thus, the detection of topological superconductivity has become a frontier in condensed matter physics and materials science. Here, we review a way to detect topological superconductivity triggered by the hard point contact: tip-induced superconductivity(TISC) and tip-enhanced superconductivity(TESC). The TISC refers to the superconductivity induced by a non-superconducting tip at the point contact on non-superconducting materials. We take the elaboration of the chief experimental achievement of TISC in topological Dirac semimetal Cd_3As_2 and Weyl semimetal Ta As as key components of this article for detecting topological superconductivity. Moreover, we also briefly introduce the main results of another exotic effect, TESC, in superconducting Au_2Pb and Sr_2RuO_4 single crystals, which are respectively proposed as the candidates of helical topological superconductor and chiral topological superconductor. Related results and the potential mechanism are conducive to improving the comprehension of how to induce and enhance the topological superconductivity. 展开更多
关键词 tip-induced superconductivity Tip-enhanced superconductivity Topological superconductivity Point contact spectroscopy Topological materials
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Anisotropic interfacial superconductivity induced at point contacts on topological semimetal grey arsenic
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作者 Meng-Di Zhang Qing Wang +8 位作者 Xing-Yuan Hou Ling-Xiao Zhao Zong Wang Ya-Dong Gu Fan Zhang Zhi-An Ren Gen-Fu Chen Ning Hao Lei Shan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2023年第9期94-101,共8页
The origin of superconductivity observed at the point contact between the normal metal tip and the topological material remains uncertain due to the potential presence of superconducting elements or allotropes impurit... The origin of superconductivity observed at the point contact between the normal metal tip and the topological material remains uncertain due to the potential presence of superconducting elements or allotropes impurities.It is imperative to seek out a topological material entirely free of superconducting impurities and induce superconductivity between it and normal tips to verify the source of the induced superconductivity.Here,we report the observation of superconductivity up to 9 K induced at point contacts between normal metal tips and the topological material grey arsenic,which is free of superconductivity.The determined temperature dependencies of superconducting gapsΔ(T)deviate from the Bardeen-Cooper-Schriefer(BCS)superconductivity law,exhibiting abnormal behavior.Furthermore,the highly anisotropic upper critical field H_(c2)(T)suggests the anisotropy of the projected interfacial Fermi surface.By tuning the junction resistance,we obtained a negative correlation between the superconducting gapΔand the efective barrier height Z,which validates the interfacial coupling strength as a key factor in the observed tip-induced superconductivity.These experimental results provide guidance for the relevant theory about tip-induced superconductivity on topological materials. 展开更多
关键词 tip-induced superconductivity topological material interfacial superconductivity grey As
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Ferromagnetic tip induced unconventional superconductivity in Weyl semimetal 被引量:2
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作者 He Wang Yingping He +5 位作者 Yiyuan Liu Zhujun Yuan Shuang Jia Lei Ma Xiong-Jun Liu jian Wang 《Science Bulletin》 SCIE EI CSCD 2020年第1期21-26,M0003,共7页
The metallic tip-induced superconductivity in normal Weyl semimetal offers a promising platform to study topological superconductivity,which is currently a research focus in condensed matter physics.Here we experiment... The metallic tip-induced superconductivity in normal Weyl semimetal offers a promising platform to study topological superconductivity,which is currently a research focus in condensed matter physics.Here we experimentally uncover that unconventional superconductivity can be induced by hard point contact(PC)method of ferromagnetic tips in Ta As single crystals.The magneto-transport measurements of the ferromagnetic tip-induced superconducting(FTISC)states exhibit the quantum oscillations,which reveal that the superconductivity is induced in the topologically nontrivial Fermi surface of the Weyl semimetal,and show compatibility of ferromagnetism and induced superconductivity.We further measure the point contact spectra(PCS)of tunneling transport for FTISC states which are potentially of nontrivial topology.Considering that the magnetic Weyl semimetal with novel superconductivity is hard to realize in experiment,our results show a new route to investigate the unconventional superconductivity by combining the topological semimetal with ferromagnetism through hard PC method. 展开更多
关键词 Topological superconductivity Coexistence of ferromagnetism and superconductivity Weyl semimetal Ferromagnetic tip-induced superconductivity Point contact spectroscopy
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