期刊
PHYSICAL REVIEW B
卷 78, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.092507
关键词
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资金
- National Science Foundation [DMR-0454672]
- NSERC of Canada
We have studied incommensurate spin ordering in single-crystal underdoped La2-xBaxCuO4 with x similar to 0.08, 0.05, and 0.025 using neutron-scattering techniques. Static incommensurate magnetic order is observed in the La2-xBaxCuO4 (x = 0.05 and 0.025) compounds with ordering wave vectors which are rotated by 45 about the commensurate (0.5,0.5,0) position, with respect to that in the superconducting x = 0.08 material. These spin modulations are one dimensional in the x = 0.05 and 0.025 samples, with ordering wave vectors lying along the orthorhombic b* direction. Such a rotation in the orientation of the static spin ordering as a function of increasing Ba doping, from diagonal to collinear, is roughly coincident with the transition from an insulating to a superconducting ground state and is similar to that observed in the related La2-xSrxCuO4 system. This phenomenon is therefore a more generic property of underdoped La-214 cuprates.
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