OBSERVATION BY ELECTRON-SPIN RESONANCE OF A PSEUDO-CUBIC SITE IN YBA2CU3O7-X

被引：40

作者：

MEHRAN, F ^{[1
]}

BARNES, SE ^{[1
]}

MCGUIRE, TR ^{[1
]}

DINGER, TR ^{[1
]}

KAISER, DL ^{[1
]}

HOLTZBERG, F ^{[1
]}

机构：

[1] UNIV GENEVA,DEPT PHYS MAT CONDENSEE,CH-1211 GENEVA 4,SWITZERLAND

来源：

SOLID STATE COMMUNICATIONS | 1988年 / 66卷 / 03期

关键词：

CRYSTALS - Magnetic Field Effects - ELECTRONS - Resonance - HEAT TREATMENT - Annealing - SUPERCONDUCTIVITY;

D O I：

10.1016/0038-1098(88)90567-4

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We report electron paramagnetic resonance experiments in single crystals of the high T//c superconductor YBa//2Cu//3O//7// minus //x. No EPR signal is observed in the spectra of the properly annealed crystals with T//c congruent 90K. However, we observe a strong, almost isotropic Cu**2** plus signal in the spectra of the as-grown (unannealed) single crystals with T//c congruent 40K. The observed signal has a slightly anisotropic g-factor which becomes totally isotropic at T congruent 90K. The linewidth, dominated by the hyperfine interaction, remains anisotropic at all temperatures, showing that the signal originates from a site which does not have real cubic symmetry.

引用

页码：299 / 302

页数：4

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