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Fermi surface transformation at the pseudogap critical point of a cuprate superconductor


Yawen Fang
Gael Grissonnanche
Anaëlle Legros
Simon Verret
Francis Laliberté
C. Collignon
Amirreza Ataei
Maxime Dion
Jianshi Zhou
David Graf
Michael Lawler
Paul Goddard
Louis Taillefer
B. Ramshaw


The nature of the pseudogap phase remains a major puzzle in our understanding of cuprate high-temperature superconductivity. Whether or not this metallic phase is defined by any of the reported broken symmetries, the topology of its Fermi surface remains a fundamental open question. Here we use angle-dependent magnetoresistance (ADMR) to measure the Fermi surface of the La1.6–xNd0.4SrxCuO4 cuprate. Outside the pseudogap phase, we fit the ADMR data and extract a Fermi surface geometry that is in excellent agreement with angle-resolved photoemission data. Within the pseudogap phase, the ADMR is qualitatively different, revealing a transformation of the Fermi surface. We can rule out changes in the quasiparticle lifetime as the sole cause of this transformation. We find that our data are most consistent with a pseudogap Fermi surface that consists of small, nodal hole pockets, thereby accounting for the drop in carrier density across the pseudogap transition found in several cuprates. © 2022, The Author(s), under exclusive licence to Springer Nature Limited.

Date Published


Nature Physics





Number of Pages





Group (Lab)

Brad Ramshaw Group
Michael Lawler Group

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