Magnetic-Field-Induced Spin Excitations and Renormalized Spin Gap of the Underdoped La{sub 1.895}Sr{sub 0.105}CuO{sub 4} Superconductor
- Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH-5232 Villigen PSI (Switzerland)
- Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI (Switzerland)
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London (United Kingdom)
- Institut Laue-Langevin, BP 156, F-38042 Grenoble (France)
- BENSC Hahn-Meitner-Institut, 14109 Berlin Wannsee (Germany)
- 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, Vol. 98, Issue 7; Other Information: DOI: 10.1103/PhysRevLett.98.077004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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