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Science. 2019 Jun 7;364(6444):976-980. doi: 10.1126/science.aat1773.

Magnetic field-induced pair density wave state in the cuprate vortex halo.

Author information

1
Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA.
2
Department of Applied Physics, Stanford University, Stanford, CA 94305, USA.
3
School of Physics and Astronomy, University of St. Andrews, Fife KY16 9SS, Scotland.
4
Condensed Matter Physics Department, Brookhaven National Laboratory, Upton, NY, USA.
5
Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.
6
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan.
7
Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
8
Department of Physics, Harvard University, Cambridge, MA 02138, USA.
9
Department of Physics and Astronomy, Binghamton University, Binghamton, NY 13902, USA.
10
Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853, USA. jcdavis@ccmr.cornell.edu mhh32@cornell.edu.
11
Department of Physics, University College Cork, Cork T12R5C, Ireland.
12
Clarendon Laboratory, Oxford University, Oxford, OX1 3PU, UK.

Abstract

High magnetic fields suppress cuprate superconductivity to reveal an unusual density wave (DW) state coexisting with unexplained quantum oscillations. Although routinely labeled a charge density wave (CDW), this DW state could actually be an electron-pair density wave (PDW). To search for evidence of a field-induced PDW, we visualized modulations in the density of electronic states N(r) within the halo surrounding Bi2Sr2CaCu2O8 vortex cores. We detected numerous phenomena predicted for a field-induced PDW, including two sets of particle-hole symmetric N(r) modulations with wave vectors QP and 2Q P , with the latter decaying twice as rapidly from the core as the former. These data imply that the primary field-induced state in underdoped superconducting cuprates is a PDW, with approximately eight CuO2 unit-cell periodicity and coexisting with its secondary CDWs.

PMID:
31171694
DOI:
10.1126/science.aat1773

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