Quantum size effect of 2DEG confined within BaTiO3/SrTiO 3: Nb Superlattices

Yuki Nakanishi; Hiromichi Ohta; Teruyasu Mizoguchi; Yuichi Ikuhara; Kunihito Koumoto

Quantum size effect of 2DEG confined within BaTiO₃/SrTiO ₃: Nb Superlattices

Yuki Nakanishi, Hiromichi Ohta, Teruyasu Mizoguchi, Yuichi Ikuhara, Kunihito Koumoto

Research output: Contribution to journal › Conference article › peer-review

Abstract

Carrier transport properties such as carrier concentration (n_e), Hall mobility (μ_Hall) and Seebeck coefficient (S) for the superlattices of [(BaTiO₃)_x/(SrTi_0.7Nb _0.3O₃)₁]_z (x = 1, 4, 6, 9 and 15) were measured to clarify the critical barrier thickness for the electron confinement in a unit cell layer thickness of SrTi_0.7Nb _0.3O₃. The μ_Hall values drastically decreased with the x-value due to the Ba-alloying occurred. We observed enhancement of |S| value in BaTiO₃/SrTi_1-xNb _xO₃ superlattices due to the quantum size effect, which is similar to SrTiO₃/SrTi_0.8Nb_0.2O₃ superlattices. Critical BaTiO₃ layer thickness for fully confinement of the conduction electron significantly decreased (6 unit cells) as compared to that of SrTiO₃/SrTi_0.8Nb_0.2O₃ superlattices.

Original language	English
Pages (from-to)	375-380
Number of pages	6
Journal	Materials Research Society Symposium Proceedings
Volume	1044
Publication status	Published - 2008 Oct 9
Event	Thermoelectric Power Generation - Boston, MA, United States Duration: 2007 Nov 26 → 2007 Nov 29

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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@article{bd3a5cc3d5ef44688bec0e480213d1d6,

title = "Quantum size effect of 2DEG confined within BaTiO3/SrTiO 3: Nb Superlattices",

abstract = "Carrier transport properties such as carrier concentration (ne), Hall mobility (μHall) and Seebeck coefficient (S) for the superlattices of [(BaTiO3)x/(SrTi0.7Nb 0.3O3)1]z (x = 1, 4, 6, 9 and 15) were measured to clarify the critical barrier thickness for the electron confinement in a unit cell layer thickness of SrTi0.7Nb 0.3O3. The μHall values drastically decreased with the x-value due to the Ba-alloying occurred. We observed enhancement of |S| value in BaTiO3/SrTi1-xNb xO3 superlattices due to the quantum size effect, which is similar to SrTiO3/SrTi0.8Nb0.2O3 superlattices. Critical BaTiO3 layer thickness for fully confinement of the conduction electron significantly decreased (6 unit cells) as compared to that of SrTiO3/SrTi0.8Nb0.2O3 superlattices.",

author = "Yuki Nakanishi and Hiromichi Ohta and Teruyasu Mizoguchi and Yuichi Ikuhara and Kunihito Koumoto",

year = "2008",

month = oct,

day = "9",

language = "English",

volume = "1044",

pages = "375--380",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

publisher = "Materials Research Society",

note = "Thermoelectric Power Generation ; Conference date: 26-11-2007 Through 29-11-2007",

}

TY - JOUR

T1 - Quantum size effect of 2DEG confined within BaTiO3/SrTiO 3

T2 - Thermoelectric Power Generation

AU - Nakanishi, Yuki

AU - Ohta, Hiromichi

AU - Mizoguchi, Teruyasu

AU - Ikuhara, Yuichi

AU - Koumoto, Kunihito

PY - 2008/10/9

Y1 - 2008/10/9

N2 - Carrier transport properties such as carrier concentration (ne), Hall mobility (μHall) and Seebeck coefficient (S) for the superlattices of [(BaTiO3)x/(SrTi0.7Nb 0.3O3)1]z (x = 1, 4, 6, 9 and 15) were measured to clarify the critical barrier thickness for the electron confinement in a unit cell layer thickness of SrTi0.7Nb 0.3O3. The μHall values drastically decreased with the x-value due to the Ba-alloying occurred. We observed enhancement of |S| value in BaTiO3/SrTi1-xNb xO3 superlattices due to the quantum size effect, which is similar to SrTiO3/SrTi0.8Nb0.2O3 superlattices. Critical BaTiO3 layer thickness for fully confinement of the conduction electron significantly decreased (6 unit cells) as compared to that of SrTiO3/SrTi0.8Nb0.2O3 superlattices.

AB - Carrier transport properties such as carrier concentration (ne), Hall mobility (μHall) and Seebeck coefficient (S) for the superlattices of [(BaTiO3)x/(SrTi0.7Nb 0.3O3)1]z (x = 1, 4, 6, 9 and 15) were measured to clarify the critical barrier thickness for the electron confinement in a unit cell layer thickness of SrTi0.7Nb 0.3O3. The μHall values drastically decreased with the x-value due to the Ba-alloying occurred. We observed enhancement of |S| value in BaTiO3/SrTi1-xNb xO3 superlattices due to the quantum size effect, which is similar to SrTiO3/SrTi0.8Nb0.2O3 superlattices. Critical BaTiO3 layer thickness for fully confinement of the conduction electron significantly decreased (6 unit cells) as compared to that of SrTiO3/SrTi0.8Nb0.2O3 superlattices.

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M3 - Conference article

AN - SCOPUS:54749147978

VL - 1044

SP - 375

EP - 380

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

SN - 0272-9172

Y2 - 26 November 2007 through 29 November 2007

ER -