title: Ideal charge-density-wave order in the high-field state of superconducting YBCO.
abstract: The existence of charge-density-wave (CDW) correlations in cuprate superconductors has now been established. However, the nature of the CDW ground state has remained uncertain because disorder and the presence of superconductivity typically limit the CDW correlation lengths to only a dozen unit cells or less. Here we explore the field-induced 3D CDW correlations in extremely pure detwinned crystals of YBa2Cu3O2(YBCO) ortho-II and ortho-VIII at magnetic fields in excess of the resistive upper critical field ([Formula: see text]) where superconductivity is heavily suppressed. We observe that the 3D CDW is unidirectional and possesses a long in-plane correlation length as well as significant correlations between neighboring CuO2planes. It is significant that we observe only a single sharply defined transition at a critical field proportional to [Formula: see text], given that the field range used in this investigation overlaps with other high-field experiments including quantum oscillation measurements. The correlation volume is at least two to three orders of magnitude larger than that of the zero-field CDW. This is by far the largest CDW correlation volume observed in any cuprate crystal and so is presumably representative of the high-field ground state of an "ideal" disorder-free cuprate.
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
authors.forename: H
authors.initials: H
authors.lastname: Jang
authors.affiliation: Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025.
authors.forename: W-S
authors.initials: WS
authors.lastname: Lee
authors.affiliation: Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nojiri
authors.affiliation: Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Matsuzawa
authors.affiliation: Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Yasumura
authors.affiliation: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305.
authors.forename: L
authors.initials: L
authors.lastname: Nie
authors.affiliation: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305.
authors.forename: A V
authors.initials: AV
authors.lastname: Maharaj
authors.affiliation: SwissFEL, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
authors.forename: S
authors.initials: S
authors.lastname: Gerber
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
authors.forename: Y-J
authors.initials: YJ
authors.lastname: Liu
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
authors.forename: A
authors.initials: A
authors.lastname: Mehta
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1.|Canadian Institute for Advanced Research, Toronto, ON, Canada M5G 1Z8.
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1.|Canadian Institute for Advanced Research, Toronto, ON, Canada M5G 1Z8.
authors.forename: R
authors.initials: R
authors.lastname: Liang
authors.affiliation: Department of Physics & Astronomy, University of British Columbia, Vancouver, BC, Canada V6T 1Z1.|Canadian Institute for Advanced Research, Toronto, ON, Canada M5G 1Z8.
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.|Department of Physics, Western Michigan University, Kalamazoo, MI 49008.
authors.forename: C A
authors.initials: CA
authors.lastname: Burns
authors.affiliation: The Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439.
authors.forename: Z
authors.initials: Z
authors.lastname: Islam
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
authors.forename: S
authors.initials: S
authors.lastname: Song
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
authors.forename: J
authors.initials: J
authors.lastname: Hastings
authors.affiliation: Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025.
authors.forename: T P
authors.initials: TP
authors.lastname: Devereaux
authors.affiliation: Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025.|Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305.
authors.forename: Z-X
authors.initials: ZX
authors.lastname: Shen
authors.affiliation: Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305; kivelson@stanford.edu dlzhu@slac.stanford.edu jslee@slac.stanford.edu.
authors.forename: S A
authors.initials: SA
authors.lastname: Kivelson
authors.affiliation: SLAC National Accelerator Laboratory, Menlo Park, CA 94025.
authors.forename: C-C
authors.initials: CC
authors.lastname: Kao
authors.affiliation: Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025; kivelson@stanford.edu dlzhu@slac.stanford.edu jslee@slac.stanford.edu.
authors.forename: D
authors.initials: D
authors.lastname: Zhu
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025; kivelson@stanford.edu dlzhu@slac.stanford.edu jslee@slac.stanford.edu.
authors.forename: J-S
authors.initials: JS
authors.lastname: Lee
keywords: charge-density-wave order; competing order; high magnetic field X-ray scattering; high-temperature superconductors; vestigial nematic order