High bias anomaly in YBa2Cu3O7-x/LaMnO3+δ/YBa2Cu3O7-x superconductor/ferromagnetic insulator/superconductor junctions: Evidence for a long-range superconducting proximity effect through the conduction band of a ferromagnetic insulator

被引：22

作者：

Golod, T. ^{[1
]}

Rydh, A. ^{[1
]}

Krasnov, V. M. ^{[1
]}

Marozau, I. ^{[2
,3
]}

Uribe-Laverde, M. A. ^{[2
,3
]}

Satapathy, D. K. ^{[2
,3
]}

Wagner, Th. ^{[2
,3
]}

Bernhard, C. ^{[2
,3
]}

机构：

[1] Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden

[2] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

[3] Univ Fribourg, Fribourg Ctr Nanomat, CH-1700 Fribourg, Switzerland

来源：

PHYSICAL REVIEW B | 2013年 / 87卷 / 13期

基金：

瑞典研究理事会;

关键词：

MAGNETIC TUNNEL-JUNCTIONS; ELECTRIC-FIELD; SPIN; MAGNETORESISTANCE; MANGANITES; DEPENDENCE; LA1-XSRXMNO3; TEMPERATURE; TRANSPORT; OXIDES;

D O I：

10.1103/PhysRevB.87.134520

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the perpendicular transport characteristics of small superconductor/ferromagnetic insulator/superconductor (YBa2Cu3O7-x/LaMnO3+delta/YBa2Cu3O7-x) tunnel junctions. At a large bias voltage V similar to 1 V we observe a steplike onset of excess current that occurs below the superconducting transition temperature T < T-c and is easily suppressed by a magnetic field. The phenomenon is attributed to a different type of the superconducting proximity effect of nonequilibrium electrons injected into the conduction band of the ferromagnetic insulator via a Fowler-Nordheim tunneling process. The occurrence of a strongly nonequilibrium population is confirmed by the detection of photon emission at large bias voltage. Since the conduction band in our ferromagnetic insulator is strongly spin polarized, the long range (20 nm) of the observed proximity effect provides evidence for an unconventional spin-triplet superconducting state.

引用

页数：11

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