Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} Superconductor

Journal Article · Fri Feb 16 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.077004· OSTI ID:20955476

Chang, J; Gilardi, R; Pailhes, S; Niedermayer, Ch; Mesot, J ^[1]; Schnyder, A P; Mudry, C ^[2]; Roennow, H M ^[1]; Christensen, N B ^[1]; McMorrow, D F ^[3]; Hiess, A; Stunault, A; Enderle, M ^[4]; Lake, B; Sobolev, O ^[5]; Momono, N; Oda, M; Ido, M ^[6]

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1. Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI (Switzerland)
2. Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI (Switzerland)
3. London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London (United Kingdom)
4. Institut Laue-Langevin, BP 156, F-38042 Grenoble (France)
5. BENSC Hahn-Meitner-Institut, 14109 Berlin Wannsee (Germany)
6. Department of Physics, Hokkaido University-Sapporo 060-0810 (Japan)

High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La{sub 1.895}Sr{sub 0.105}CuO{sub 4} (LSCO). In zero field, the temperature dependence of the low-energy peak intensity at the incommensurate momentum transfer Q{sub IC}=(0.5,0.5{+-}{delta},0),(0.5{+-}{delta},0.5,0) exhibits an anomaly at the superconducting T{sub c} which broadens and shifts to lower temperature upon the application of a magnetic field along the c axis. A field-induced enhancement of the spectral weight is observed, but only at finite energy transfers and in an intermediate temperature range. These observations establish the opening of a strongly downward renormalized spin gap in the underdoped regime of LSCO. This behavior contrasts with the observed doping dependence of most electronic energy features.

• OSTI ID: 20955476
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
ENERGY TRANSFER
EXCITATION
INELASTIC SCATTERING
LANTHANUM COMPOUNDS
MAGNETIC FIELDS
MOMENTUM TRANSFER
NEUTRONS
SPIN
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE