Bounding the pseudogap with a line of phase transitions in YBa 2 Cu 3 O 6+δ . Arkady Shekhter, 1 B. J. Ramshaw, 1 Ruixing Liang, 2, 3 W. N. Hardy, 2, 3 D. A. Bonn, 2, 3 Fedor F. Balakirev, 1 Ross D. McDonald, 1 Jon B. Betts, 1 Scott C. Riggs, 4, 5 and Albert Migliori 1 1 Pulsed Field Facility, NHMFL, Los Alamos National Laboratory, Los Alamos, NM 87545 2 Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada, V6T 1Z1 3 Canadian Institute for Advanced Research, Toronto, Canada, M5G 1Z8 4 Stanford Institute of Materials and Energy Sciences, Stanford University, Stanford, CA 94305, USA 5 Departments of Physics and Applied Physics, and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305, USA (Dated: October 15, 2018) arXiv:1208.5810v3 [cond-mat.supr-con] 8 Jun 2013