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Phase diagram of the electron-doped La2-xCexCuO4 cuprate superconductor from Andreev bound states at grain boundary junctions

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2008

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Wagenknecht, Michael
Koelle, Dieter
Kleiner, Reinhold
Graser, Siegfried
Schopohl, Nils
Chesca, Boris
Tsukada, A.
Gross, Rudolf

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https://doi.org/10.1103/PhysRevLett.100.227001
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http://arxiv.org/abs/0709.2853

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Physical Review Letters. American Physical Society (APS). 2008, 100(22), 227001. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.100.227001

Zusammenfassung

We use quasiparticle tunneling across La2−xCexCuO4 grain boundary junctions to probe the superconducting state and its disappearance with increasing temperature and magnetic field. A zero bias conductance peak due to zero energy surface Andreev bound states is a clear signature of the phase coherence of the superconducting state. Hence, such a peak must disappear at or below the upper critical field Bc2(T). For La2−xCexCuO4 this approach sets a lower bound for Bc2(0)≈25  T which is substantially higher than reported previously. The method of probing the superconducting state via Andreev bound states should also be applicable to other cuprate superconductors.

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ISO 690WAGENKNECHT, Michael, Dieter KOELLE, Reinhold KLEINER, Siegfried GRASER, Nils SCHOPOHL, Boris CHESCA, A. TSUKADA, Sebastian T. B. GOENNENWEIN, Rudolf GROSS, 2008. Phase diagram of the electron-doped La2-xCexCuO4 cuprate superconductor from Andreev bound states at grain boundary junctions. In: Physical Review Letters. American Physical Society (APS). 2008, 100(22), 227001. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.100.227001
BibTex
@article{Wagenknecht2008-06-06Phase-53540,
  year={2008},
  doi={10.1103/PhysRevLett.100.227001},
  title={Phase diagram of the electron-doped La<sub>2-x</sub>Ce<sub>x</sub>CuO<sub>4</sub> cuprate superconductor from Andreev bound states at grain boundary junctions},
  number={22},
  volume={100},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Wagenknecht, Michael and Koelle, Dieter and Kleiner, Reinhold and Graser, Siegfried and Schopohl, Nils and Chesca, Boris and Tsukada, A. and Goennenwein, Sebastian T. B. and Gross, Rudolf},
  note={Article Number: 227001}
}
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    <dcterms:abstract xml:lang="eng">We use quasiparticle tunneling across La&lt;sub&gt;2−x&lt;/sub&gt;Ce&lt;sub&gt;x&lt;/sub&gt;CuO&lt;sub&gt;4&lt;/sub&gt; grain boundary junctions to probe the superconducting state and its disappearance with increasing temperature and magnetic field. A zero bias conductance peak due to zero energy surface Andreev bound states is a clear signature of the phase coherence of the superconducting state. Hence, such a peak must disappear at or below the upper critical field B&lt;sub&gt;c2&lt;/sub&gt;(T). For La&lt;sub&gt;2−x&lt;/sub&gt;Ce&lt;sub&gt;x&lt;/sub&gt;CuO&lt;sub&gt;4&lt;/sub&gt; this approach sets a lower bound for B&lt;sub&gt;c2&lt;/sub&gt;(0)≈25  T which is substantially higher than reported previously. The method of probing the superconducting state via Andreev bound states should also be applicable to other cuprate superconductors.</dcterms:abstract>
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