Magnetic Response in the Underdoped Cuprates

Details Magnetic Response in the Underdoped Cuprates Magnetic Response in the Underdoped Cuprates

2011-12-12

arxiv.org/abs/1112.2676v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We examine the dynamical magnetic response of the underdoped cuprates by employing a phenomenological theory of a doped resonant valence bond state where the Fermi surface is truncated into four pockets. This theory predicts a resonant spin response which with increasing energy (0 to 100meV) appears as an hourglass. The very low energy spin response is found at (pi,pi +- delta) and (pi +- delta,pi) and is determined by scattering from the pockets' frontside to the tips of opposite pockets where a van Hove singularity resides. At energies beyond 100 meV, strong scattering is seen from (pi,0) to (pi,pi). This theory thus provides a semi-quantitative description of the spin response seen in both INS and RIXS experiments at all relevant energy scales.

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