Transport properties of a quasi-two-dimensional electron system formed in LaAlO3/EuTiO3/SrTiO3 heterostructures

被引：29

作者：

De Luca, G. M. ^{[1
,2
]}

Di Capua, R. ^{[1
,2
]}

Di Gennaro, E. ^{[1
,2
]}

Granozio, F. Miletto ^{[1
,2
]}

Stornaiuolo, D. ^{[1
,2
]}

Salluzzo, M. ^{[1
,2
]}

Gadaleta, A. ^{[3
,4
]}

Pallecchi, I. ^{[3
,4
]}

Marre, D. ^{[3
,4
]}

Piamonteze, C. ^{[5
]}

Radovic, M. ^{[5
,6
]}

Ristic, Z. ^{[7
]}

Rusponi, S. ^{[7
]}

机构：

[1] Univ Naples Federico II, CNR SPIN, I-80126 Naples, Italy

[2] Univ Naples Federico II, Dipartimento Fis, I-80126 Naples, Italy

[3] Univ Genoa, CNR SPIN, I-14146 Genoa, Italy

[4] Univ Genoa, Dipartimento Fis, I-14146 Genoa, Italy

[5] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[6] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland

[7] Ecole Polytech Fed Lausanne, Inst Condensed Matter Phys, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 22期

关键词：

LOW-TEMPERATURE; INTERFACES; SUPERCONDUCTIVITY; COEXISTENCE; MOBILITY; OXIDES;

D O I：

10.1103/PhysRevB.89.224413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the structural, magnetic, and transport properties of LaAlO3/EuTiO3/SrTiO3 heterostructures grown by pulsed laser deposition. The samples are characterized in situ by electron diffraction and scanning probe microscopy and ex situ by transport measurements and x-ray absorption spectroscopy. LaAlO3/EuTiO3/SrTiO3 films show a ferromagnetic transition at T <= 7.5 K, related to the ordering of Eu2+ spins, even in samples characterized by just two EuTiO3 unit cells. A finite metallic conductivity is observed only in the case of samples composed by one or two EuTiO3 unit cells and, simultaneously, by a LaAlO3 thickness greater than or equal to four unit cells. The effect of ferromagnetic EuTiO3 on the transport properties of delta-doped LaAlO3/EuTiO3/SrTiO3 is critically discussed.

引用

页数：6

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