Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session R04: "Whither Pairing Correlations or Quantum Criticality driven Pseudogap in the Cuprate Superconductors?"
8:00 AM–11:00 AM,
Thursday, March 8, 2018
LACC Room: 151
Sponsoring Units: DCMP DCP
Chair: Laura Greene, Florida State Univ
Abstract: R04.00001 : The quantum critical point of cuprate superconductors
8:00 AM–8:36 AM
I will present recent experimental studies performed using high magnetic fields to suppress superconductivity and access the non-superconducting ground state of cuprates in the T = 0 limit. These reveal the presence of a quantum critical point in the phase diagram of cuprates [1,2,3], where the enigmatic pseudogap phase ends, around which the superconducting phase forms a dome, and at which the resistivity exhibits an anomalous linear dependence on temperature [4,5].
In particular, our recent measurements of the normal-state specific heat C(T) down to very low temperature (0.5 K) reveal clear thermodynamic signatures of a quantum critical point, with C/T showing a sharp peak at the pseudogap critical doping p*, and C/T ~ log(1/T) at p = p*.
Strong similarities with the quantum critical point at which antiferromagnetic order ends in organic , iron-based , heavy-fermion  and electron-doped cuprate  superconductors suggest that antiferromagnetic spin correlations also play a fundamental role in hole-doped cuprates. The outstanding questions are : Does antiferromagnetic order extend up to the critical point in hole-doped cuprates ? Is long-range order necessary to open a (pseudo)gap and generate anomalous, non-Fermi-liquid, scattering and mass renormalization down to T ~ 0 ?
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