Gapless spin excitations in superconducting La2xCa1+xCu2O6 with Tc up to 55 K

John A. Schneeloch, Ruidan Zhong, M. B. Stone, I. A. Zaliznyak, G. D. Gu, Guangyong Xu, and J. M. Tranquada
Phys. Rev. B 99, 174515 – Published 22 May 2019

Abstract

We report inelastic neutron scattering on single crystals of the bilayer cuprate family La2xCa1+xCu2O6+δ, including two crystals made superconducting (transitions at 45 and 55 K) by high-pressure annealing in an oxygen-containing atmosphere. The magnetic excitations in the nonsuperconducting crystal have a similar temperature dependence as those in weakly hole-doped cuprates. In the superconducting crystals, there is a near-uniform suppression of the magnetic spectral weight with increasing temperature; in particular, there are no signs of a spin gap or “resonance” peak. This is different from the temperature dependence seen in many optimally doped cuprates but similar to the behavior seen in certain underdoped cuprates. We discuss the possible connection with pair-density-wave superconductivity.

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  • Received 20 February 2019
  • Revised 9 May 2019

DOI:https://doi.org/10.1103/PhysRevB.99.174515

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

John A. Schneeloch1,2,*, Ruidan Zhong1,3,†, M. B. Stone4, I. A. Zaliznyak1, G. D. Gu1, Guangyong Xu1,‡, and J. M. Tranquada1

  • 1Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11794, USA
  • 3Materials Science and Engineering Department, Stony Brook University, Stony Brook, New York 11794, USA
  • 4Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *Present address: Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA.
  • Present address: Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
  • Present address: NIST Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA.

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Issue

Vol. 99, Iss. 17 — 1 May 2019

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