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Superconductivity in monocrystalline YNiSi3 and LuNiSi3
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Arantes, Fabiana R., Aristizábal-Giraldo, Deisy, Mayoh, Daniel, Yamane, Yu, Yang, Chongli, Lees, Martin R., Osorio-Guillén, Jorge M., Takabatake, Toshiro and Avila, Marcos A. (2019) Superconductivity in monocrystalline YNiSi3 and LuNiSi3. Physical Review B, 99 (22). 224505. doi:10.1103/PhysRevB.99.224505 ISSN 2469-9950.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.99.224505
Abstract
We report the discovery of bulk superconductivity in the ternary intermetallics YNiSi3 and LuNiSi3. High-quality single crystals were grown via the Sn-flux method and studied using magnetization, specific-heat, and resistivity measurements at low temperatures. The critical temperatures obtained from these different techniques are in very good agreement and yield Tc=1.36(3)K and Tc=1.61(2)K for YNiSi3 and LuNiSi3, respectively. Magnetization measurements indicate that both compounds are among the rare cases where type-I superconductivity occurs in a ternary intermetallic, however, the jump in the specific heat at the transition is lower than the value expected from BCS theory (ΔCel/γnTc=1.43) in both materials and is equal to 1.14(9) and 0.71(5) for the Y and Lu compounds, respectively. Resistivity measurements exhibit sharp transitions but with critical fields μ0Hc(0) (≈0.05T for YNiSi3 and ≈0.08T for LuNiSi3) considerably higher than those obtained from the magnetization and specific heat (≈0.01T). First-principles density functional theory calculated electronic structure shows that these compounds have highly anisotropic and complex Fermi surfaces with one electronic and two holelike branches. One hole branch and the electron branch have a large cylindrical topology connecting the first Brillouin-zone boundaries, the former being built up by the hybridization of Y(Lu) d, Ni d, and Si p states, and the latter being built up by Ni d and Si p states. The calculated phononic structures indicate that the coupling of the Y(Lu), Ni d, and Si p electrons in the low-lying optical phonon branches is responsible for the formation of Cooper pairs and the observed superconducting state. Therefore, these compounds can be classified as anisotropic three-dimensional metals with multiband superconducting ground states in the weak-coupling regime.
Item Type: | Journal Article | |||||||||||||||||||||||||||
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Subjects: | Q Science > QC Physics | |||||||||||||||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||||||||||||||
Library of Congress Subject Headings (LCSH): | Superconductivity, Superconductors, Intermetallic compounds | |||||||||||||||||||||||||||
Journal or Publication Title: | Physical Review B | |||||||||||||||||||||||||||
Publisher: | American Physical Society | |||||||||||||||||||||||||||
ISSN: | 2469-9950 | |||||||||||||||||||||||||||
Official Date: | 1 June 2019 | |||||||||||||||||||||||||||
Dates: |
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Volume: | 99 | |||||||||||||||||||||||||||
Number: | 22 | |||||||||||||||||||||||||||
Article Number: | 224505 | |||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevB.99.224505 | |||||||||||||||||||||||||||
Status: | Peer Reviewed | |||||||||||||||||||||||||||
Publication Status: | Published | |||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||||||||||||||
Copyright Holders: | © 2019 American Physical Society | |||||||||||||||||||||||||||
Date of first compliant deposit: | 17 June 2019 | |||||||||||||||||||||||||||
Date of first compliant Open Access: | 19 June 2019 | |||||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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