Electronically competing phases and their magnetic field dependence in electron-doped nonsuperconducting and superconducting Pr0.88LaCe0.12CuO4±δ -: art. no. 214512

被引:48
作者
Kang, HJ [1 ]
Dai, P
Mook, HA
Argyriou, DN
Sikolenko, V
Lynn, JW
Kurita, Y
Komiya, S
Ando, Y
机构
[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
[2] Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA
[3] Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany
[4] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA
[5] Cent Res Inst Elect Power Ind, Komae, Tokyo 2018511, Japan
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevB.71.214512
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present comprehensive neutron scattering studies of nonsuperconducting and superconducting electron-doped Pr0.88LaCe0.12CuO4 +/-delta (PLCCO). At zero field, the transition from antiferromagnetic (AF) as-grown PLCCO to superconductivity without static antiferromagnetism can be achieved by annealing the sample in pure Ar at different temperatures, which also induces an epitaxial (Pr, La, Ce)(2)O-3 phase as an impurity. When the superconductivity first appears in PLCCO, a quasi-two-dimensional (2D) spin-density-wave (SDW) order is also induced, and both coexist with the residual three-dimensional (3D) AF state. A magnetic field applied along the [(1) over bar, 1, 0] direction parallel to the CuO2 plane induces a "spin-flop" transition, where the noncollinear AF spin structure of PLCCO is transformed into a collinear one. The spin-flop transition is continuous in semiconducting PLCCO, but gradually becomes sharp with increasing doping and the appearance of superconductivity. A c-axis aligned magnetic field that suppresses the superconductivity also enhances the quasi-2D SDW order at (0.5, 0.5, 0) for underdoped PLCCO. However, there is no effect on the 3D AF order in either superconducting or nonsuperconducting samples. Since the same field along the [(1) over bar, 1, 0] direction in the CuO2 plane has no (or little) effect on the superconductivity, (0.5, 0.5, 0) and (Pr, La, Ce)(2)O-3 impurity positions, we conclude that the c-axis field-induced effect is intrinsic to PLCCO and arises from the suppression of superconductivity.
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页数:17
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