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PhysRevB.87.214521.pdf | 1.33 MB | Adobe PDF | 見る/開く |
タイトル: | Increase of superfluid density with growth of quasiparticle density of states probed by intrinsic tunneling spectroscopy in Bi_{1.9}Pb_{0.1}Sr_{2}CaCu_{2}O_{8+δ} |
著者: | Kambara, Hitoshi Kakeya, Itsuhiro https://orcid.org/0000-0003-4999-2111 (unconfirmed) Suzuki, Minoru |
著者名の別形: | 神原, 仁志 |
発行日: | 28-Jun-2013 |
出版者: | American Physical Society |
誌名: | Physical Review B |
巻: | 87 |
号: | 21 |
論文番号: | 214521 |
抄録: | Interlayer tunneling spectra, the Josephson critical current density J_{c}, and the normal tunneling resistance have been measured simultaneously for intrinsic Josephson junctions of Bi_{1.9}Pb_{0.1}Sr_{2}CaCu_{2}O_{8+δ} (BiPb2212) in the underdoped region using a small mesa structure (S=1×1 μm2) and a short-pulse technique. J_{c} was significantly enhanced when Bi was partially replaced with Pb. By comparing Jc with the value estimated by the Ambegaokar-Baratoff formula, it was found that superfluid density doubles in the Pb-containing sample. In addition, Pb raises the superconducting coherence peak without changing the value of the superconducting gap Δ. Based on a model that accounts for the inhomogeneity of Δ in k space, we argue that the superfluid density increases because Pb substitution increases the homogeneity of Δ(k). |
著作権等: | ©2013 American Physical Society |
URI: | http://hdl.handle.net/2433/176356 |
DOI(出版社版): | 10.1103/PhysRevB.87.214521 |
出現コレクション: | 学術雑誌掲載論文等 |
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