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Pressure Effects and Orbital Characters in Cuprate and Carbon-Based Superconductors

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Abstract

Pressure effect is overviewed for the cuprates and carbon-based superconductors, with an emphasis on how their orbital characters are modified by pressure. For the high-Tc cuprates, we start from the observation for ambient pressure that, on top of the main orbital (dx 2−y 2), a hybridization with the second (dz 2) orbital around the Fermi energy significantly affects T c in the spin-fluctuation mediated pairing, where the hybridization is dominated by material parameters. We can then show that applying pressures along a, b axes enhances Tc while a c-axis pressure suppresses Tc, where not only the dz 2 hybridization but also Cu(4s) hybridization exert an effect. For the multi-layer cuprates, interlayer pair hopping is suggested to be important, which may contribute to pressure effect. Pressure effect is also interesting in a recently discovered aromatic family of superconductors (picene, etc.). There, we have again multi-band systems, which in this case derive from different molecular orbitals. The Fermi surface is an intriguing composite of different pockets/sheets having different dimensionalities arising from anisotropic transfers between the molecular orbitals, and pressure effects should be an important probe of these.

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Acknowledgements

For the cuprates HA wishes to thank Hirofumi Sakakibara, Kazuhiko Kuroki, Ryotaro Arita and Douglas J. Scalapino for collaborations. The study has been supported by a Grant-in-Aid for Scientific Research from JSPS (No. 22340093). For carbon systems we acknowledge Yuta Murakami, Philipp Werner and Naoto Tsuji for a collaboration (HA), and Erio Tosatti, Kosmas Prassides, Yoshihiro Kubozono and Takashi Kambe for discussions. The study has been supported by LEMSUPER (JST-EU Superconductor Project) from JST.

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Authors and Affiliations

  1. Department of Physics, University of Tokyo, Hongo, Tokyo, 113-0033, Japan

    Hideo Aoki

  2. Division of Physics, University of Tsukuba, Tsukuba, Ibaraki, 305-8571, Japan

    Toshikaze Kariyado

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  1. Hideo Aoki
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  2. Toshikaze Kariyado
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Correspondence to Hideo Aoki.

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Aoki, H., Kariyado, T. Pressure Effects and Orbital Characters in Cuprate and Carbon-Based Superconductors. J Supercond Nov Magn 27, 995–1001 (2014). https://doi.org/10.1007/s10948-013-2425-8

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