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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References in corpus (15)

• Theory of Intertwined Orders in High Temperature Superconductors
• Energy gaps in high-transition temperature cuprate superconductors
• Resonant X-ray Scattering Study of Charge Density Wave Correlations in YBa${}_2$Cu${}_3$O${}_{6+x}$
• Incipient charge order observed by NMR in the normal state of YBa2Cu3Oy
• Appearance of fluctuating stripes at the onset of the pseudogap in the high-Tc Superconductor Bi2Sr2CaCu2O8+x
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Competing charge, spin, and superconducting orders in underdoped YBa2Cu3Oy
• Ground State Phase Diagram of the $t$-$t^{\prime }$-$J$ model
• Cuprate superconductors as viewed through a striped lens
• Vortex Lattice Melting and Hc2 in underdoped YBa2Cu3Oy
• Locally commensurate charge-density wave with three-unit-cell periodicity in YBCO
• The emergence of global phase coherence from local pairing in underdoped cuprates
• High-T${}_c$ cuprates: a story of two electron subsystems
• Superfluid density and two-component conductivity in hole-doped cuprates
• Superconductivity in the two-dimensional Hubbard model with cellular dynamical mean-field theory: a quantum impurity model analysis

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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