Superconductivity in CaSn<sub>3</sub> single crystals with a AuCu<sub>3</sub>-type structure

Luo, X.; Shao, Ding-Fu; Pei, Qijun; Song, Jiangpeng; Hu, Lei; Han, Yang; Zhu, Xuebin; Song, Wenhai; Lu, W. J.; Sun, Young

doi:10.1039/c5tc02373d

Cited by 26 publications

(60 citation statements)

References 31 publications

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“…S1). Moreover, we also found CaSn3 single crystals are air sensitive, consistent with the previous report [35]. When a sample is left in air for more than 30 minutes, the surface color changes dramatically.…”

Section: Experimental Methodssupporting

confidence: 92%

“…The cubic shape of the obtained crystals is consistent with the face-centered cubic structure for CaSn3 ( Fig. 1a) [35], which is further confirmed by X-ray diffraction measurements (XRD) (see supplementary Fig. S1).…”

Section: Experimental Methodssupporting

confidence: 81%

“…4c and 4e in ref. [35], while those higher frequencies (i.e. F γ , F ε and F η ) might correspond to those larger Fermi pockets centered around the Brillouin zone center and boundaries ( Fig.…”

Section: A Relativistic Fermion Behavior In Casnmentioning

confidence: 96%

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Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn₃

Zhu

Womack

et al. 2019

J. Phys.: Condens. Matter

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Topological materials which are also superconducting are of great current interest, since they may exhibit a non-trivial topologically-mediated superconducting phase. Although there have been many reports of pressure-tuned or chemical-doping-induced superconductivity in a variety of topological materials, there have been few examples of intrinsic, ambient pressure superconductivity in a topological system having a stoichiometric composition. Here, we report that the pure intermetallic CaSn3 not only exhibits topological fermion properties, but also has a superconducting phase at ~1.178 K under ambient pressure. The topological fermion properties, including the nearly zero quasi-particle mass and the non-trivial Berry phase accumulated in cyclotron motions, were revealed from the de Haas-van Alphen (dHvA) quantum oscillation studies of this material. Although CaSn3 was previously reported to be superconducting with Tc =

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Section: Experimental Methodssupporting

confidence: 92%

Section: Experimental Methodssupporting

confidence: 81%

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Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn₃

Zhu

Womack

et al. 2019

J. Phys.: Condens. Matter

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“…The lattice constant a = 4.74 Å was taken from a recent experimental report on CaSn 3 . 30 The ions were then relaxed fixing the volume as well as the lattice constant of the unit cell. We first study the electronic structure of CaSn 3 in the absence of SOC.…”

Section: Methodsmentioning

confidence: 99%

Topologically nontrivial electronic states in CaSn3

Gupta

Juneja

Shinde

et al. 2017

Journal of Applied Physics

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Based on the first-principles calculations, we theoretically propose topologically non-trivial states in a recently experimentally discovered superconducting material CaSn 3 . When the spin-orbit coupling (SOC) is ignored, the material is a host to three-dimensional topological nodal-line semimetal states. Drumhead like surface states protected by the coexistence of time-reversal and mirror symmetry emerge within the two-dimensional regions of the surface Brillouin zone connecting the nodal lines. When SOC is included, unexpectedly, each nodal line evolves into two Weyl nodes (W1, W2) in this centrosymmetric material. Berry curvature calculations show that these nodes occur in a pair and act as either a source or sink of Berry flux. The material also has unique surface states in the form of Fermi arcs, which unlike other known Weyl semimetal, form closed loops of surface states on the Fermi surface. Our theoretical realization of topologically nontrivial states in a superconducting material paves the way towards unraveling the interconnection between topological physics and superconductivity.

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“…Recently, magnetic susceptibility, electrical resistivity, and specific-heat measurements reveal that CaSn 3 exhibits superconductivity with a superconducting transition temperature of 4.2 K [36]. The magnetization versus magnetic field (M-H) curve displays the typical type-II behavior [36]. In this work [36], the electronic band structure and electronic total density of states for this superconductor have been presented by using the density functional theory.…”

mentioning

confidence: 93%

Theoretical investigation of superconductivity in the non-centrosymmetric SrPtGe₃ and CaPtSi₃ compounds

Uzunok

Tütüncü

Srivastava

et al. 2018

Philosophical Magazine

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TITLETheoretical investigation of superconductivity in the non-centrosymmetric SrPtGe3 and CaPtSi3 compounds AUTHORS Uzunok, HY; Tütüncü, HM; Srivastava, GP; et al. JOURNAL Philosophical Magazine DEPOSITED IN OREWe present results for the structural, electronic, vibrational, and electron-phonon coupling properties of LaSn 3 and CaSn 3 adopting the simple cubic AuCu 3 -type structure obtained using the the generalized gradient approximation of the density functional theory and plane wave ab initio pseudopotential method. Our electronic results show that both materials display metallic character with several bands, which have mainly Sn 5p character, crossing the Fermi level. The calculated phonon spectrum of LaSn 3 accords very well with reported experimental measurements. The weights of the peaks in the Eliashberg spectral function of both compounds are enhanced with the use of experimental lattice constant in our electron-phonon calculation, increasing the value of average electron phonon coupling parameter from 0.876 to 0.937 for LaSn 3 (by 7%) and from 0.642 to 0.725 for CaSn 3 (by 13%). The use of experimental lattice constant also improves the agreement between theoretical and experimental values of the superconducting temperature for both compounds. IntroductionThe RX 3 (R = rare earth elements, X = In, Sn, Tl, Pb) intermetallic materials adopting the simple cubic AuCu 3 -type structure have received a large deal of attention from the scientific community because of their various properties changing from magnetism to superconductivity . Some of these compounds, such as PrSn 3 and NdSn 3 exhibit antiferromagnetic ordering with the Néel temperatures of 8.6 and 4.5 K [2, 10]. In addition, PrSn 3 and CePb 3 are also known as heavy-fermion compounds [15,23], while CeSn 3 has been classified as a dense Kondo compound displaying valence fluctuations [15,20]. Furthermore, the LaX 3 (X = In, Sn, Tl, Pb) compounds have received considerably more attention than other AuCu 3 -type compounds because they all display superconductivity. The superconducting transition temperature of LaSn 3 is reported to be around 6.5 K [1,6,27], which is relatively larger than the corresponding value for LaIn 3 , LaPb 3 and LaTl 3 [3,7,27,30]. The average electron-phonon coupling parameter of LaSn 3 has been reported to be 0.80 in the experimental work of Toxen and co-workers [5], which suggests that the electron-phonon interaction in this superconductor is of medium strength.The existence of superconductivity in LaSn 3 motivated several theoretical groups [31-35] to investigate its structural, elastic and electronic properties. Koelling [31] has been performed self-consistent linearized augmented plane wave (LAPW) calculations for the Fermi surface topology of LaSn 3 . The linearized muffin-tin-orbital method with the atomic sphere approximation (LMTO-ASA) [32] has been utilized to determine the electronic band structure of LaSn 3 . This theoretical [32] work suggests that LaSn 3 acts like a transition metal compound since the bonding sta...

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Superconductivity in CaSn₃ single crystals with a AuCu₃-type structure

Abstract: We report the superconductivity of CaSn3 single crystals with a AuCu3-type structure, namely cubic space group Pm3̄m.

Cited by 26 publications

References 31 publications

Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn₃

Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn₃

Topologically nontrivial electronic states in CaSn3

Theoretical investigation of superconductivity in the non-centrosymmetric SrPtGe₃ and CaPtSi₃ compounds

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Superconductivity in CaSn3 single crystals with a AuCu3-type structure

Abstract: We report the superconductivity of CaSn3 single crystals with a AuCu3-type structure, namely cubic space group Pm3̄m.

Cited by 26 publications

References 31 publications

Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn3

Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn3

Topologically nontrivial electronic states in CaSn3

Theoretical investigation of superconductivity in the non-centrosymmetric SrPtGe3 and CaPtSi3 compounds

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Product

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Superconductivity in CaSn₃ single crystals with a AuCu₃-type structure

Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn₃

Emergence of intrinsic superconductivity below 1.178 K in the topologically non-trivial semimetal state of CaSn₃

Theoretical investigation of superconductivity in the non-centrosymmetric SrPtGe₃ and CaPtSi₃ compounds