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Title: Hourglass Dispersion and Resonance of Magnetic Excitations in the Superconducting State of the Single-Layer Cuprate HgBa 2 CuO 4 + δ Near Optimal Doping

Here, we use neutron scattering to study magnetic excitations near the antiferromagnetic wave vector in the underdoped single-layer cuprate HgBa 2 CuO 4 + δ (superconducting transition temperature T c ≈ 88 K , pseudogap temperature T* ≈ 220 K ). The response is distinctly enhanced below T* and exhibits a Y -shaped dispersion in the pseudogap state, whereas the superconducting state features an X -shaped (hourglass) dispersion and a further resonancelike enhancement. We also observe a large spin gap of about 40 meV in both states. This phenomenology is reminiscent of that exhibited by bilayer cuprates. The resonance spectral weight, irrespective of doping and compound, scales linearly with the putative binding energy of a spin exciton described by an itinerant-spin formalism.
Authors:
ORCiD logo [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [2] ;  [2] ;  [4] ;  [3] ;  [3] ;  [2]
  1. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). National High Magnetic Field Lab.
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  3. Alternative Energies and Atomic Energy Commission (CEA) and French National Center for Scientific Research (CNRS), Saclay (France). Leon Brillouin Lab.
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Publication Date:
Report Number(s):
LA-UR-17-22091
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1703287
Grant/Contract Number:
AC52-06NA25396; FG02-06ER46275; SC-0006858; LANLF100
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 27; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High Magnetic Field Science
OSTI Identifier:
1407882
Alternate Identifier(s):
OSTI ID: 1338134