title: Fragile charge order in the nonsuperconducting ground state of the underdoped high-temperature superconductors.
abstract: The normal state in the hole underdoped copper oxide superconductors has proven to be a source of mystery for decades. The measurement of a small Fermi surface by quantum oscillations on suppression of superconductivity by high applied magnetic fields, together with complementary spectroscopic measurements in the hole underdoped copper oxide superconductors, point to a nodal electron pocket from charge order in YBa2Cu3(6+δ). Here, we report quantum oscillation measurements in the closely related stoichiometric material YBa2Cu4O8, which reveals similar Fermi surface properties to YBa2Cu3(6+δ), despite the nonobservation of charge order signatures in the same spectroscopic techniques, such as X-ray diffraction, that revealed signatures of charge order in YBa2Cu3(6+δ). Fermi surface reconstruction in YBa2Cu4O8 is suggested to occur from magnetic field enhancement of charge order that is rendered fragile in zero magnetic fields because of its potential unconventional nature and/or its occurrence as a subsidiary to more robust underlying electronic correlations.
authors.affiliation: Cavendish Laboratory, Cambridge University, Cambridge CB3 OHE, United Kingdom;
authors.forename: B S
authors.initials: BS
authors.lastname: Tan
authors.affiliation: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545;
authors.forename: N
authors.initials: N
authors.lastname: Harrison
authors.affiliation: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545;
authors.forename: Z
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545;
authors.forename: F
authors.initials: F
authors.lastname: Balakirev
authors.affiliation: National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM 87545;
authors.forename: B J
authors.initials: BJ
authors.lastname: Ramshaw
authors.affiliation: Cavendish Laboratory, Cambridge University, Cambridge CB3 OHE, United Kingdom;
authors.forename: A
authors.initials: A
authors.lastname: Srivastava
authors.forename: S A
authors.initials: SA
authors.lastname: Sabok-Sayr
authors.affiliation: Physics Department, Northern Illinois University, DeKalb, IL 60115.
authors.forename: S A
authors.initials: SA
authors.lastname: Sabok
authors.affiliation: Physics Department, Northern Illinois University, DeKalb, IL 60115.
authors.forename: B
authors.initials: B
authors.lastname: Dabrowski
authors.affiliation: Cavendish Laboratory, Cambridge University, Cambridge CB3 OHE, United Kingdom;
authors.forename: G G
authors.initials: GG
authors.lastname: Lonzarich
authors.affiliation: Cavendish Laboratory, Cambridge University, Cambridge CB3 OHE, United Kingdom; suchitra@phy.cam.ac.uk.
authors.forename: Suchitra E
authors.initials: SE
authors.lastname: Sebastian
keywords: Fermi surface; charge order; high-Tc cuprate superconductors; strongly correlated electron systems; superconductivity