Magnetic phase diagram of underdoped YBa2Cu3Oy inferred From torque magnetization and thermal conductivity

Fan Yu, Max Hirschberger, Toshinao Loew, Gang Li, Benjamin J. Lawson, Tomoya Asaba, J. B. Kemper, Tian Liang, Juan Porras, Gregory S. Boebinger, John Singleton, Bernhard Keimer, Lu Li, N. Phuan Ong

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


Strong evidence for charge-density correlation in the underdoped phase of the cuprate YBa2Cu3Oywas obtained by NMR and resonant X-ray scattering. The fluctuations were found to be enhanced in strong magnetic fields. Recently, 3D charge-density-wave (CDW) formation with long-range order (LRO) was observed by X-ray diffraction in H> 15 T. To elucidate how the CDW transition impacts the pair condensate, we have used torque magnetization to 45 T and thermal conductivity κxxto construct the magnetic phase diagram in untwinned crystals with hole density p = 0.11. We show that the 3D CDW transitions appear as sharp features in the susceptibility and κxxat the fields HKand Hp, which define phase boundaries in agreement with spectroscopic techniques. From measurements of the melting field Hm(T) of the vortex solid, we obtain evidence for two vortex solid states below 8 K. At 0.5 K, the pair condensate appears to adjust to the 3D CDW by a sharp transition at 24 T between two vortex solids with very different shear moduli. At even higher H (41 T), the second vortex solid melts to a vortex liquid which survives to fields well above 41 T. de Haas-van Alphen oscillations appear at fields 24-28 T, below the lower bound for the upper critical field Hc2.

Original languageEnglish (US)
Pages (from-to)12667-12672
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number45
StatePublished - Nov 8 2016

All Science Journal Classification (ASJC) codes

  • General


  • Cuprate superconductivity
  • High-field phase diagram
  • Thermal conductivity
  • Torque magnetometry
  • Vortex liquid


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