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Quantum Matter Seminar 25th November: "High-Tc superconductivity in strongly overdoped cuprates"

22 November 2022

This seminar is on the topic of high-Tc superconductivity in extremely overdoped (p 0.4) cuprates synthesised with high-pressure oxygenation. It will be presented Prof. Andrea Gauzzi (IMPMC, Sorbonne University).

Join the Quantum Matter group in a seminar titled "High-Tc superconductivity in strongly overdoped cuprates" with Prof. Andrea Gauzzi (IMPMC, Sorbonne University).

Date: 25 November 2022, 2:00PM - 3:00PM

Zoom Link:

Meeting ID: 987 7539 0060 

Passcode: 329952


For over three decades, research on superconducting cuprates has been focused on the underdoped and optimally doped regions of the electronic phase diagram, where these materials display an unconventional normal state – or “strange metal” – properties. It is widely accepted that, in the overdoped region at p > 0.27 hole/Cu, where superconductivity disappears, the properties are conventional, i.e. Fermi-liquid like. In fact, until recently, this region has been little studied owing to the difficulty of overdoping the CuO2 plane, so such conventional scenario for overdoped cuprates has never been verified experimentally in a systematic manner.

Here we present recent results that give evidence of high-Tc superconductivity in a number of cuprates, such as Cu0.75Mo0.25Sr2YCu2O7.54 [1], Ba2CuO4-y [2] and La2-xCaxCuO4 [3], where strong overdoping, p > 0.4 hole/Cu, is achieved using high-pressure oxygenation during synthesis. In order to investigate the superconducting properties in this unusual region of the phase diagram, we studied the local structure of the above compounds by means of Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy. To our surprise, we found huge (~1 Å) dynamical distortions of the lattice at Tc that involve the apical oxygen [4,5], which suggests the existence of a lattice-driven change of the electronic structure in the superconducting state. The above unexpected results put into question the validity of the current phenomenological description of cuprates [6,7]. Specifically, we shall discuss the possibility of multi-orbital superconductivity [8] and the consequences of the nonadiabatic scenario suggested by our experiments on the description of the electron-lattice dynamics [5].

Further information

[1] A. Gauzzi, Y. Klein, M. Nisula, M. Karppinen, P. K. Biswas, H. Saadaoui, E. Morenzoni, P. Manuel, D. Khalyavin, M. Marezio, and T. H. Geballe, Bulk superconductivity at 84 K in the strongly overdoped regime of cuprates, Phys. Rev. B 94, 180509(R) (2016).

[2] W. M. Li et al., Superconductivity in a unique type of copper oxide, Proc. Natl. Acad. Sci. USA 116, 12156 (2019).

[3] G. Kim, K. S. Rabinovich, A. V. Boris, A. N. Yaresko, Y. E. Suyolcu, Y.-M. Wu, P. A. van Aken, G. Christiani, G. Logvenov, B. Keimer, Optical conductivity and superconductivity in highly overdoped La2−xCaxCuO4 thin films, Proc. Natl. Acad. Sci. USA 118, e2106170118 (2021).

[4] S. D. Conradson, T. H. Geballe, A. Gauzzi, M. Karppinen, C.-Q. Jin, G. Baldinozzi, W. Li, L. Cao, E. Gilioli, J. M. Jiang, M. Latimer, O. Mueller, V. Nasretdinova, Local lattice distortions and dynamics in extremely overdoped superconducting YSr2Cu2.75Mo0.25O7.54, Proc. Natl. Acad. Sci. USA 117, 4559 (2020).

[5] S. D. Conradson, T. H. Geballe, C.-Q. Jin, L.-P. Cao, A. Gauzzi, M. Karppinen, G. Baldinozzi, W.-M. Li, E. Gilioli, J. M. Jiang, M. Latimer, O. Mueller, V. Nasretdinova., Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr2Cu2.75Mo0.25O7.54 and Sr2CuO3.3, Proc. Natl. Acad. Sci. USA 117, 33099 (2020).

[6] D. J. Scalapino, A different branch of the high Tc family? Proc. Natl. Acad. Sci. USA 116, 12129 (2019).

[7] Z. X. Li, S. A. Kivelson, D. H. Lee, Superconductor-to-metal transition in overdoped cuprates. npj Quantum Mater. 6, 36 (2021).

[8] T. Maier, T. Berlijn, and D. J. Scalapino, Two pairing domes as Cu2+ varies to Cu3+, Phys. Rev. B 99, 224515 (2019).

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