AF Spin Gap Limits the Coherent SC Gap in Cuprates
2018-05
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AF Spin Gap Limits the Coherent SC Gap in Cuprates
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2018-05
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Abstract
We have performed inelastic neutron scattering measurements of the magnetic excitations in
La(2-x)Sr(x)CuO(4) at doping levels on both sides of the putative quantum critical point, in both
the superconducting and normal states. The low-energy excitations look similar at both dopings:
there is a peak in the magnetic spectral weight at 15-20 meV, and the spin gap (~ 7 meV) in the
superconducting state develops on the low-energy side of this peak. Past work in a magnetic field
indicates that suppressing the superconducting order only causes the spin gap to fill in—there is no
evidence of critical behavior of the peak in spectral weight. I will discuss this result in the broader
context of magnetic correlations in the cuprates.
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Tranquada, John. (2018). AF Spin Gap Limits the Coherent SC Gap in Cuprates. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/197544.
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