期刊
PHYSICAL REVIEW B
卷 98, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.184411
关键词
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资金
- PELICAN [P5715, P5214, P4335]
- National Natural Science Foundation of China [11674372, 11774217, 51372149, 51672171]
- National Key Research and Development Program of China [2017YFA0302903, 2017YFA0303103, 2016YFA0300502]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB07020300]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2016004]
- National Key Basic Research Program of China [2015CB921600]
The low-energy magnetic excitation from the highly Ca-doped quasi-one-dimensional magnet SrCa13Cu24O41 was studied in the magnetic ordered state by using inelastic neutron scattering. We observed the gapless spin-wave excitation, dispersive along the a and c axes but nondispersive along the b axis. Such excitations are attributed to the spin wave from the spin-chain sublattice. Model fitting to the experimental data gives the nearest-neighbor interaction J(c) as 5.4 meV and the interchain interaction J(a) = 4.4 meV. J(c) is antiferromagnetic and its value is close to the nearest-neighbor interactions of the similar edge-sharing spin-chain systems such as CuGeO3. Comparing with the hole-doped spin chains in Sr14Cu24O41, which shows a spin gap due to spin dimers formed around Zhang-Rice singlets, the chains in SrCa13Cu24O41 show a gapless excitation in this paper. We ascribe such a change from gapped to gapless excitations to holes transferring away from the chain sublattice into the ladder sublattice upon Ca doping.
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