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Evidence for Dimer Crystal Melting in the Frustrated Spin-Ladder System BiCu2PO6

Authors
Choi, K. -Y.Hwang, J. W.Lemmens, P.Wulferding, D.Shu, G. J.Chou, F. C.
Issue Date
Mar-2013
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW LETTERS, v.110, no.11
Journal Title
PHYSICAL REVIEW LETTERS
Volume
110
Number
11
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/14775
DOI
10.1103/PhysRevLett.110.117204
ISSN
0031-9007
1079-7114
Abstract
In the spin ladder compound BiCu2PO6, there exists a decisive dynamics of spin excitations that we classify and characterize using inelastic light scattering. We observe an interladder singlet bound mode at 24 cm(-1) and two intraladder bound states at 62 and 108 cm(-1) in the leg (bb) and the rung (cc) polarization as well as a broad triplon continuum extending from 36 cm(-1) to 700 cm(-1). Though isolated spin ladder physics can roughly account for the observed excitations at high energies, frustration and interladder interactions need to be considered to fully describe the spectral distribution and scattering selection rules at low and intermediate energies. In addition, we attribute the rich spectrum of singlet bound modes to a melting of a dimer crystal. Our study provides evidence for a Z(2) quantum phase transition from a dimer to a resonating valence bond state driven by singlet fluctuations. DOI: 10.1103/PhysRevLett.110.117204
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