Large Superconducting Spin Valve Effect and Ultrasmall Exchange Splitting in Epitaxial Rare-Earth-Niobium Trilayers

被引：44

作者：

Gu, Yuanzhou ^{[1
]}

Halasz, Gabor B. ^{[2
]}

Robinson, J. W. A. ^{[1
]}

Blamire, M. G. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB3 0FS, England

[2] Univ Oxford, Theoret Phys, Oxford OX1 3NP, England

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 06期

关键词：

JOSEPHSON STRUCTURES; STATES; SUPERCURRENTS; SPINTRONICS; GD(0001); METALS; ENERGY;

D O I：

10.1103/PhysRevLett.115.067201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Epitaxial Ho/Nb/Ho and Dy/Nb/Dy superconducting spin valves show a reversible change in the zero-field critical temperature (Delta T-c0) of similar to 400 mK and an infinite magnetoresistance on changing the relative magnetization of the Ho or Dy layers. Unlike transition-metal superconducting spin valves, which show much smaller Delta T-c0 values, our results can be quantitatively modeled. However, the fits require an extraordinarily low induced exchange splitting which is dramatically lower than known values for rare-earth Fermi-level electrons, implying that new models for the magnetic proximity effect may be required.

引用

页数：5

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