Signatures of two gaps in the spin susceptibility of a cuprate superconductor

Abstract

A major obstacle to understanding high-Tc cuprates is that superconductivity precludes observing normal-state properties at low temperatures. One prime example is the normal-state spin susceptibility \c{hi}spin: although its decrease upon cooling far above Tc typifies pseudogap behavior, its behavior at low temperatures is generally unknown. Here, our measurements in high magnetic fields expose \c{hi}spin of YBa2Cu3Oy down to low temperatures. Even though superconductivity is suppressed by the field, we uncover two thermally-activated contributions alongside a residual \c{hi}spin(T=0) due to gapless excitations. We relate these two distinct gaps to short-range charge-density waves and to the formation of singlets as in certain quantum spin systems. Both phenomena thus contribute to the pseudogap at low temperature, supplementing short-lived antiferromagnetism that initiates pseudogap behavior at high temperatures. We therefore propose that the pseudogap ought to be regarded as a composite property and that, when not undergoing spin-stripe ordering, underdoped cuprates tend to form short-ranged spin singlets.

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• The foot, the fan, and the cuprate phase diagram: Fermi-volume-changing quantum phase transitions
• Beyond-Hubbard pairing in a cuprate ladder
• Robust Charge-Density Wave Correlations in Optimally-Doped YBa2Cu3Oy
• Forestalled Phase Separation as the Precursor to Stripe Order
• Coincident onset of charge order and pseudogap in a homogeneous high-temperature superconductor
• Single-particle spectra and magnetic susceptibility in the Emery model: a dynamical mean-field perspective
• Spin susceptibility in a pseudogap state with fluctuating spiral magnetic order
• Superconductivity of Bad Fermions: Origin of Two Gaps in HTSC Cuprates
• Probing the pseudogap and beyond: Examining single-particle properties of the hole- and electron-doped Hubbard model