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Title: Doping dependence of the magnetic excitations in La 2 - x Sr x CuO 4

The magnetic correlations within the cuprates have undergone intense scrutiny as part of efforts to understand high-temperature superconductivity. We explore the evolution of the magnetic correlations along the nodal direction of the Brillouin zone in La 2–xSr xCuO 4, spanning the doping phase diagram from the antiferromagnetic Mott insulator at x = 0 to the metallic phase at x = 0.26. Magnetic excitations along this direction are found to be systematically softened and broadened with doping, at a higher rate than the excitations along the antinodal direction. This phenomenology is discussed in terms of the nature of the magnetism in the doped cuprates. As a result, survival of the high-energy magnetic excitations, even in the overdoped regime, indicates that these excitations are marginal to pairing, while the influence of the low-energy excitations remains ambiguous.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [6] ;  [7] ;  [1] ;  [8] ;  [8] ;  [5] ;  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
  2. Diamond Light Source, Ltd., Oxfordshire (United Kingdom)
  3. Univ. of Bristol, Bristol (United Kingdom)
  4. Univ. Pierre et Marie Curie - Case 115, Paris Cedex 05 (France)
  5. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  6. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  7. National Synchrotron Radiation Research Center, Hsinchu (Taiwan); National Tsing Hua Univ., Hsinchu (Taiwan)
  8. Brookhaven National Lab. (BNL), Upton, NY (United States); Yale Univ., New Haven, CT (United States)
Publication Date:
Report Number(s):
BNL-113511-2017-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PO011; MA509MACA; KC0201060; KC0203020; TRN: US1700848
Grant/Contract Number:
SC00112704; 1047478
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 7; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1345728
Alternate Identifier(s):
OSTI ID: 1344594