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Title: Spin-gap evolution upon Ca doping in the spin-ladder series Sr(14−x)CaxCu24O41 studied by inelastic neutron scattering
Authors: Deng, G
Tsyrulin, N
Bourges, P
Lamago, D
Ronnow, H
Kenzelmann, M
Danilkin, S
Pomjakushina, E
Conder, K
Keywords: Calcium
Issue Date: 3-Jul-2013
Publisher: Americal Physical Society
Citation: Deng, G., Tsyrulin, N., Bourges, P., Lamago, D., Ronnow, H., Kenzelmann, M., Danilkin, S., Pomjakushina, E., & Conder, K. (2013). Spin-gap evolution upon Ca doping in the spin-ladder series Sr(14−x)CaxCu24O41 studied by inelastic neutron scattering. Physical Review B, 88 (1), Article Number 014504. doi:10.1103/PhysRevB.88.014504
Abstract: The spin-gap evolution upon Ca doping in Sr14-xCaxCu24O41 was systematically investigated using inelastic neutron scattering. We discover that the singlet-triplet spin-gap excitation survives in this series with x up to 13, indicating the singlet dimer ground state in these compounds. This observation corrects the previous speculation that the spin gap collapses at x similar to 13 by the NMR technique. The strong intensity modulation along Q(H) in x = 0 gradually evolves into a Q-independent feature in x > 11. This could be attributed to the localized Cu moment magnetism developing into an itinerant magnetism with increasing x. It is a surprise that the spin gap persists in the normal state of this spin-ladder system with metallic behavior, which evidences the possibility of magnetically mediated carrier pairing mechanism in a two-leg spin-ladder lattice. © 2013, American Physical Society.
ISSN: 1098-0121
Appears in Collections:Journal Articles

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