The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4

Details The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4 The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4

2008-08-27

arxiv.org/abs/0808.3750v1

Phys. Rev. Lett. 102, 167002 (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.102.167002

We use inelastic neutron scattering to measure the magnetic excitations in the underdoped superconductor La2-xSrxCuO4 (x=0.085, Tc=22 K) over energy and temperatures ranges 5 < E < 200 meV and 5 < T < 300 K respectively. At high temperature (T = 300 K), we observe strongly damped excitations with a characteristic energy scale of approximately 50 meV. As the temperature is lowered to T = 30 K, and we move into the pseudogap state, the magnetic excitations become highly structured in energy and momentum below about 60 meV. This change appears to be associated with the development of the pseudogap in the electronic excitations.

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