Magnetic field resonantly enhanced free spins in underdoped YBa${}_2$Cu${}_3$O${}_{6+x}$

Abstract

Using neutron scattering, we investigate the effect of a magnetic field on the static and dynamic spin response in heavily underdoped superconducting YBa${}_2$Cu${}_3$O${}_{6+x}$ (YBCO${}_{6+x}$) with x=0.33 (T${}_c$=8 K) and 0.35 (T${}_c$=18 K). In contrast to the heavily doped and superconducting monolayer cuprates, the elastic central peak characterizing static spin correlations does not respond observably to a magnetic field which suppresses superconductivity. Instead, we find a magnetic field induced resonant enhancement of the spin fluctuations. The energy scale of the enhanced fluctuations matches the Zeeman energy within both the normal and vortex phases while the momentum dependence is the same as the zero field bilayer response. The magnitude of the enhancement is very similar in both phases with a fractional intensity change of $(I/I_0-1)\sim 0.1$. We suggest that the enhancement is not directly correlated with superconductivity but is the result of almost free spins located near hole rich regions.

(8 pages, 5 figures, submitted to Physical Review B)

References in corpus (22)

• Electronic liquid crystal state in the high-temperature superconductor YBCO(6.45)
• Dynamical layer decoupling in a stripe-ordered, high T_c superconductor
• Magnetic neutron scattering in hole doped cuprate superconductors
• Tuning competing orders in La2-xSrxCuO4 cuprate superconductors by the application of an external magnetic field
• Disappearance of antiferromagnetic spin excitations in over-doped La${}_{2-x}$Sr${}_x$CuO${}_4$
• "Waterfalls" phenomenon in superconducting cuprates
• "Waterfalls" in cuprates
• Momentum and excitation energy dependence of the "waterfalls" in cuprates
• Three-dimensionality of field-induced magnetism in a high-temperature superconductor
• Spin dynamics near the critical doping in weakly-superconducting underdoped YBa2Cu3O6.35 (Tc=18K)
• Field-driven phase transitions in a quasi-two-dimensional quantum antiferromagnet
• Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped superconductor La${}_{1.895}$Sr${}_{0.105}$CuO${}_4$
• Inhomogeneous Magnetic-Field Response of YBa2Cu3Oy and La2-xSrxCuO4 Persisting above the Bulk Superconducting Transition Temperature
• Anisotropic spin and charge excitations in superconductors: signature of electronic nematic order
• Magnetic field induced enhancement of spin-order peak intensity in La(1.875)Ba(0.125)CuO(4)
• Incommensurate Spin Ordering and Fluctuations in underdoped La_{2-x}Ba_{x}CuO_{4}
• In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu(2-x)Mgx(BO3)2
• Diagonal and Collinear Incommensurate Spin Structures in underdoped La${}_{2-x}$Ba${}_x$CuO${}_4$
• Quantum Spin Excitations through the metal-to-insulator crossover in $YB{a}_{2}C{u}_3{O}_{6+y}$
• Evidence for decay of spin-waves above the pseudogap in underdoped YBa2Cu3O6.35
• Antiferromagnetic correlations near the lower edge of superconducting dome in YBCO6+x
• Quantum phase transitions in magnetism and superconductivity: emergent spin topology seen with neutrons

Cited by in corpus (10)

• Progress in Neutron Scattering Studies of Spin Excitations in High-Tc Cuprates
• Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x)
• From incommensurate correlations to mesoscopic spin resonance in YbRh2Si2
• The effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconducting YBa2Cu3O6.5
• Magnetic field-enhanced spin freezing in YBa2Cu3O6.45 at the verge of the competition between superconductivity and charge order
• Probing the connections between superconductivity, stripe order, and structure in La1.905Ba0.095Cu1-yZnyO4
• Orphan spins and bound in-gap states in the $S=\frac{5}{2}$ antiferromagnet CaFe${}_2$O${}_4$
• High-field muSR studies of superconducting and magnetic correlations in cuprates above Tc
• Separation of magnetic and superconducting behaviour in YBCO6.33 (Tc=8.4 K)
• Magnetic field tuned superconducting and normal phase magnetism in CeCo${}_{0.5}$Rh${}_{0.5}$In${}_5$