Nodeless superconductivity in the kagome metal CsV$_3$Sb$_5$
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 D. Wilson,Xianhui Chen,Yu Song,Huiqiu Yuan +15 more
TLDR
In this paper, the magnetic penetration depth of kagome metal series was measured down to 0.07 K using a technique based on the tunneling diode oscillator, showing nodeless superconductivity in CsV$_3$Sb$_5$ under ambient pressure and constrain the allowed pairing symmetry.Abstract:
The recently discovered kagome metal series $A$V$_3$Sb$_5$ ($A$=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 $\Delta\lambda(T)$ of CsV$_3$Sb$_5$ was measured down to 0.07 K. A clear exponential behavior in $\Delta\lambda(T)$ with marked deviations from a $T$ or $T^2$ temperature dependence is observed at low temperatures, indicating a deficiency of nodal quasiparticles. Temperature dependence of the superfluid density and electronic specific heat can be described by two-gap $s$-wave superconductivity, consistent with the presence of multiple Fermi surfaces in CsV$_3$Sb$_5$. These results evidence nodeless superconductivity in CsV$_3$Sb$_5$ under ambient pressure, and constrain the allowed pairing symmetry.read more
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Charge-density-wave-driven electronic nematicity in a kagome superconductor
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Posted Content
Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5
Mingu Kang,Shiang Fang,Jeong-Kyu Kim,Brenden R. Ortiz,Jonggyu Yoo,Byeong-Gyu Park,Stephen D. Wilson,Jae-Hoon Park,Riccardo Comin +8 more
TL;DR: In this paper, the van Hove singularities (vHs) arising from an intrinsic electron-hole asymmetry were examined in a recently discovered kagome metal CsV3Sb5 exhibiting charge order and superconductivity.
Journal ArticleDOI
Multiband Superconductivity with Sign-Preserving Order Parameter in Kagome Superconductor CsV_{3}Sb_{5}.
Han-Shu Xu,Yajun Yan,Ruotong Yin,Wei Xia,Shijie Fang,Ziyuan Chen,Yuanji Li,Wenqi Yang,Yanfeng Guo,Donglai Feng +9 more
TL;DR: In this paper, the superconductivity of a kagome superconductor was studied by scanning tunneling microscopy and spectroscopy at ultralow temperature with high resolution, and two kinds of superconducting gaps with multiple sets of coherent peaks and residual zero-energy density of states (DOS) were observed on both half-Cs and Sb surfaces.
References
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I and i
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
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Phenomenological theory of unconventional superconductivity
Manfred Sigrist,Kazuo Ueda +1 more
TL;DR: In this paper, a review of recent developments in the phenomenological description of unconventional superconductivity is presented, starting with the BCS theory of superconductivities with anisotropic Cooper pairing, and the group-theoretical derivation of the generalized Ginzburg-Landau theory for unconventional supercondivity.
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Fractionalized excitations in the spin-liquid state of a kagome-lattice antiferromagnet
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TL;DR: At low temperatures, neutron scattering measurements on single-crystal samples of the spin-1/2 kagome-lattice antiferromagnet ZnCu3(OD)6Cl2 (also called herbertsmithite), which provide striking evidence for this characteristic feature of spin liquids, find that the spin excitations form a continuum, in contrast to the conventional spin waves expected in orderedAntiferromagnets.
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