Optical conductivity and superconductivity in highly overdoped La2—xCaₓCuO₄ thin films
We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of La2—xCaₓCuO₄ with x up to 0.5, greatly exceeding the solubility limit of Ca in bulk systems (x ∼ 0.12). A comparison of the optical conductivity measured by spectroscopic ellipsometry to prior predictions...
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| Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 118; no. 30; pp. 1 - 5 |
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| Main Authors | , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Washington
National Academy of Sciences
27.07.2021
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| Abstract | We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of La2—xCaₓCuO₄ with x up to 0.5, greatly exceeding the solubility limit of Ca in bulk systems (x ∼ 0.12). A comparison of the optical conductivity measured by spectroscopic ellipsometry to prior predictions from dynamical mean-field theory demonstrates that the hole concentration p is approximately equal to x. We find superconductivity with Tc
of 15 to 20 K up to the highest doping levels and attribute the unusual stability of superconductivity in La2—xCaₓCuO₄ to the nearly identical radii of La and Ca ions, which minimizes the impact of structural disorder. We conclude that careful disorder management can greatly extend the “superconducting dome” in the phase diagram of the cuprates. |
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| AbstractList | We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of La2—xCaₓCuO₄ with x up to 0.5, greatly exceeding the solubility limit of Ca in bulk systems (x ∼ 0.12). A comparison of the optical conductivity measured by spectroscopic ellipsometry to prior predictions from dynamical mean-field theory demonstrates that the hole concentration p is approximately equal to x. We find superconductivity with Tc
of 15 to 20 K up to the highest doping levels and attribute the unusual stability of superconductivity in La2—xCaₓCuO₄ to the nearly identical radii of La and Ca ions, which minimizes the impact of structural disorder. We conclude that careful disorder management can greatly extend the “superconducting dome” in the phase diagram of the cuprates. We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of La2−xCaxCuO4 with x up to 0.5, greatly exceeding the solubility limit of Ca in bulk systems (x∼0.12). A comparison of the optical conductivity measured by spectroscopic ellipsometry to prior predictions from dynamical mean-field theory demonstrates that the hole concentration p is approximately equal to x. We find superconductivity with Tc of 15 to 20 K up to the highest doping levels and attribute the unusual stability of superconductivity in La2−xCaxCuO4 to the nearly identical radii of La and Ca ions, which minimizes the impact of structural disorder. We conclude that careful disorder management can greatly extend the "superconducting dome" in the phase diagram of the cuprates. Chemical substitution is widely used to modify the charge-carrier concentration (“doping”) in complex quantum materials, but the influence of the associated structural disorder on the electronic phase behavior remains poorly understood. We synthesized thin films of the high-temperature superconductor L a 2 − x C a x C u O 4 with minimal structural disorder and characterized their doping levels through measurements of the optical conductivity. We find that superconductivity with T c = 15 to 20 K is stable up to much higher doping levels than previously found for analogous compounds with stronger disorder. The results imply that doping-induced disorder is the leading cause of the degradation of superconductivity for large carrier concentration, and they open up a previously inaccessible regime of the phase diagram of high-temperature superconductors to experimental investigation. We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of L a 2 − x C a x C u O 4 with x up to 0.5, greatly exceeding the solubility limit of Ca in bulk systems ( x ∼ 0.12 ). A comparison of the optical conductivity measured by spectroscopic ellipsometry to prior predictions from dynamical mean-field theory demonstrates that the hole concentration p is approximately equal to x . We find superconductivity with T c of 15 to 20 K up to the highest doping levels and attribute the unusual stability of superconductivity in L a 2 − x C a x C u O 4 to the nearly identical radii of La and Ca ions, which minimizes the impact of structural disorder. We conclude that careful disorder management can greatly extend the “superconducting dome” in the phase diagram of the cuprates. |
| Author | Rabinovich, Ksenia S. Boris, Alexander V. Suyolcu, Y. Eren Yaresko, Alexander N. Christiani, Georg Logvenov, Gennady Keimer, Bernhard Kim, Gideok van Aken, Peter A. Wu, Yu-Mi |
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| Copyright | Copyright National Academy of Sciences Jul 27, 2021 Copyright © 2021 the Author(s). Published by PNAS. 2021 |
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| DOI | 10.1073/pnas.2106170118 |
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| Notes | Author contributions: G.K., A.V.B., G.L., and B.K. designed research; G.K., K.S.R., A.V.B., A.N.Y., Y.E.S., Y.-M.W., P.A.v.A., G.C., G.L., and B.K. performed research; and G.K., A.V.B., and B.K. wrote the paper. Edited by Steven A. Kivelson, Stanford University, Stanford, CA, and approved June 10, 2021 (received for review March 31, 2021) |
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| Snippet | We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of La2—xCaₓCuO₄ with x up to 0.5, greatly exceeding the solubility... We have used atomic layer-by-layer oxide molecular beam epitaxy to grow epitaxial thin films of La2−xCaxCuO4 with x up to 0.5, greatly exceeding the solubility... Chemical substitution is widely used to modify the charge-carrier concentration (“doping”) in complex quantum materials, but the influence of the associated... |
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| SubjectTerms | Calcium ions Conductivity Cuprates Epitaxial growth Mean field theory Molecular beam epitaxy Phase diagrams Physical Sciences Spectroellipsometry Superconductivity Thin films |
| Title | Optical conductivity and superconductivity in highly overdoped La2—xCaₓCuO₄ thin films |
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