Spin dynamics in the mixed phase of La2-xSrxCuO4 (x=0.10, x=0.17)

We present an inelastic neutron scattering study of the spin dynamics in the mixed phase of the high-T-c superconductor La2-xSrxCuO4, In the overdoped regime (x = 0. 17, T-c = 37 K) the application of a magnetic field induces a spectral weight redistribution centered around the zero-field spin gap (Delta(SG) approximate to 5 6.5 meV). Moreover the opening of the spin gap seems to track the irreversibility temperature (related to the melting of the vortex lattice) rather than T-c, indicating an unusual interplay between the mesoscopic and microscopic properties in La2-xSrxCuO4. In the underdoped regime (x = 0. 10, T-c = 29 K) our zero-field data indicate a strong decrease (or even vanishing) of the spin gap in the superconducting state and no dependence upon the application of a magnetic field.


Published in:
Physica B-Condensed Matter, 350, 1-3, 72-75
Year:
2004
ISSN:
0921-4526
Keywords:
Note:
Swiss Fed Inst Technol, Neutron Scattering Lab, CH-5232 Villigen, Switzerland. Paul Scherrer Inst, CH-5232 Villigen, Switzerland. Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France. CEA, DRFMC, CENG, F-38054 Grenoble 9, France. Hokkaido Univ, Dept Phys, Sapporo, Hokkaido 0600810, Japan. Gilardi, R, Swiss Fed Inst Technol, Neutron Scattering Lab, CH-5232 Villigen, Switzerland. raffaele.gilardi@psi.ch
Laboratories:




 Record created 2007-01-24, last modified 2018-03-17


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