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

共 46 条

[11] Magnetization-orientation dependence of the superconducting transition temperature in the ferromagnet-superconductor-ferromagnet system: CuNi/Nb/CuNi [J].

Gu, JY ;

You, CY ;

Jiang, JS ;

Pearson, J ;

Bazaliy, YB ;

Bader, SD .

PHYSICAL REVIEW LETTERS, 2002, 89 (26)

[12] Magnetic state controllable critical temperature in epitaxial Ho/Nb bilayers [J].

Gu, Yuanzhou ;

Robinson, J. W. A. ;

Bianchetti, M. ;

Stelmashenko, N. A. ;

Astill, D. ;

Grosche, F. M. ;

MacManus-Driscoll, J. L. ;

Blamire, M. G. .

APL MATERIALS, 2014, 2 (04)

[13] EXPERIMENTAL ENERGY-BANDS OF A RARE-EARTH-METAL - GD(0001) [J].

HIMPSEL, FJ ;

REIHL, B .

PHYSICAL REVIEW B, 1983, 28 (02) :574-578

[14] Angular dependence of superconductivity in superconductor/spin-valve heterostructures [J].

Jara, Alejandro A. ;

Safranski, Christopher ;

Krivorotov, Ilya N. ;

Wu, Chien-Te ;

Malmi-Kakkada, Abdul N. ;

Valls, Oriol T. ;

Halterman, Klaus .

PHYSICAL REVIEW B, 2014, 89 (18)

[15] Transition from the 0 state to the π state in S-FNF-S Josephson structures [J].

Karminskaya, T. Yu. ;

Kupriyanov, M. Yu. .

JETP LETTERS, 2007, 86 (01) :61-66

[16] Effective decrease in the exchange energy in S-(FN)-S Josephson structures [J].

Karminskaya, T. Yu. ;

Kupriyanov, M. Yu. .

JETP LETTERS, 2007, 85 (06) :286-291

[17] STUDY OF THE 4F AND VALENCE BAND DENSITY OF STATES IN RARE-EARTH-METALS .2. EXPERIMENT AND RESULTS [J].

LANG, JK ;

BAER, Y ;

COX, PA .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1981, 11 (01) :121-138

[18] Peculiarities of performance of the spin valve for the superconducting current [J].

Leksin, P. V. ;

Kamashev, A. A. ;

Garif'yanov, N. N. ;

Garifullin, I. A. ;

Fominov, Ya. V. ;

Schumann, J. ;

Hess, C. ;

Kataev, V. ;

Buechner, B. .

JETP LETTERS, 2013, 97 (08) :478-482

[19] Physical properties of the superconducting spin-valve Fe/Cu/Fe/In heterostructure [J].

Leksin, P. V. ;

Garif'yanov, N. N. ;

Garifullin, I. A. ;

Schumann, J. ;

Kataev, V. ;

Schmidt, O. G. ;

Buechner, B. .

PHYSICAL REVIEW B, 2012, 85 (02)

[20] Manifestation of New Interference Effects in a Superconductor-Ferromagnet Spin Valve [J].

Leksin, P. V. ;

Garif'yanov, N. N. ;

Garifullin, I. A. ;

Schumann, J. ;

Kataev, V. ;

Schmidt, O. G. ;

Buechner, B. .

PHYSICAL REVIEW LETTERS, 2011, 106 (06)

← 1 2 3 4 5 →