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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

Journal Article · · Physical Review Letters
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

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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE
Grant/Contract Number:
AC52-06NA25396; FG02-06ER46275; SC-0006858; LANLF100
OSTI ID:
1407882
Alternate ID(s):
OSTI ID: 1338134
Report Number(s):
LA-UR-17-22091; PRLTAO; TRN: US1703287
Journal Information:
Physical Review Letters, Vol. 117, Issue 27; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (5)

Spin excitation spectrum of high-temperature cuprate superconductors from finite cluster simulations journal September 2018
Effective SU(2) theory for the pseudogap state journal March 2017
Synchrotron X-Ray Scattering Study of Charge-Density-Wave Order in $HgBa_{2}CuO_{4+δ}$ text January 2017
Spin excitation spectrum of high-temperature cuprate superconductors from finite cluster simulations text January 2017
Low-energy antiferromagnetic spin fluctuations limit the coherent superconducting gap in cuprates text January 2018

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