Properties of doped and undoped (Ca,Sr)CuO2 thin films

D. P. Norton; B. C. Chakoumakos; J. D. Budai; E. C. Jones; D. K. Christen; D. H. Lowndes

Properties of doped and undoped (Ca,Sr)CuO₂ thin films

D. P. Norton, B. C. Chakoumakos, J. D. Budai, E. C. Jones, D. K. Christen, D. H. Lowndes

Single Crystal Diffraction

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

2 Scopus citations

Abstract

We have studied the transport and structural properties of (Ca, Sr)CuO₂, Sr_1-yNd_yCuO₂, and Sr_1-x CuO_2-δ thin films grown by pulsed-laser deposition. Stoichiometric 'infinite layer' (Ca, Sr)CuO₂ thin films grown over a large range of growth conditions are insulators, while superconductivity is observed in Sr_1-yNd_yCuO₂ films with T_c(onset)approx.28K for y=0.10. A Nd solubility limit of y=0.10 is observed with the appearance of a new phase with capprox.0.37nm for y>0.10. In addition, the transport and structural properties of Sr_1-xCuO_2-δ thin films grown by pulsed-laser deposition support the contention that the tetragonal phase is capable of accommodating a significant density of alkaline-earth deficiencies up to x≥0.3. Resistivity measurements indicate a significant change in the carrier density of the CuO₂ planes as Sr vacancies are introduced. In addition, an enigmatic anomaly in resistivity at 185K is observed for Sr_0.85CuO_2-δ thin films. Magnetic measurements on these samples indicate that, although a significant drop in resistivity at 185K is observed, it is not due to a superconducting transition. Hall measurements, as well as changes in resistivity with film growth conditions, suggest that the majority carriers in these Sr_1-xCuO_2-δ thin films are electrons even with the Sr-vacancies present.

Original language	English
Pages (from-to)	69-73
Number of pages	5
Journal	Denshi Gijutsu Sogo Kenkyusho Iho/Bulletin of the Electrotechnical Laboratory
Volume	58
Issue number	6
State	Published - 1994
Event	Proceedings of ETL Workshop on High Temperature Superconductors - Tsukuba, Jpn Duration: Dec 6 1993 → Dec 8 1993

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@article{dfc59d3a3b62416381d97f5dd0244b45,

title = "Properties of doped and undoped (Ca,Sr)CuO2 thin films",

abstract = "We have studied the transport and structural properties of (Ca, Sr)CuO2, Sr1-yNdyCuO2, and Sr1-x CuO2-δ thin films grown by pulsed-laser deposition. Stoichiometric 'infinite layer' (Ca, Sr)CuO2 thin films grown over a large range of growth conditions are insulators, while superconductivity is observed in Sr1-yNdyCuO2 films with Tc(onset)approx.28K for y=0.10. A Nd solubility limit of y=0.10 is observed with the appearance of a new phase with capprox.0.37nm for y>0.10. In addition, the transport and structural properties of Sr1-xCuO2-δ thin films grown by pulsed-laser deposition support the contention that the tetragonal phase is capable of accommodating a significant density of alkaline-earth deficiencies up to x≥0.3. Resistivity measurements indicate a significant change in the carrier density of the CuO2 planes as Sr vacancies are introduced. In addition, an enigmatic anomaly in resistivity at 185K is observed for Sr0.85CuO2-δ thin films. Magnetic measurements on these samples indicate that, although a significant drop in resistivity at 185K is observed, it is not due to a superconducting transition. Hall measurements, as well as changes in resistivity with film growth conditions, suggest that the majority carriers in these Sr1-xCuO2-δ thin films are electrons even with the Sr-vacancies present.",

author = "Norton, {D. P.} and Chakoumakos, {B. C.} and Budai, {J. D.} and Jones, {E. C.} and Christen, {D. K.} and Lowndes, {D. H.}",

year = "1994",

language = "English",

volume = "58",

pages = "69--73",

journal = "Denshi Gijutsu Sogo Kenkyusho Iho/Bulletin of the Electrotechnical Laboratory",

issn = "0366-9092",

number = "6",

note = "Proceedings of ETL Workshop on High Temperature Superconductors ; Conference date: 06-12-1993 Through 08-12-1993",

}

TY - JOUR

T1 - Properties of doped and undoped (Ca,Sr)CuO2 thin films

AU - Norton, D. P.

AU - Chakoumakos, B. C.

AU - Budai, J. D.

AU - Jones, E. C.

AU - Christen, D. K.

AU - Lowndes, D. H.

PY - 1994

Y1 - 1994

N2 - We have studied the transport and structural properties of (Ca, Sr)CuO2, Sr1-yNdyCuO2, and Sr1-x CuO2-δ thin films grown by pulsed-laser deposition. Stoichiometric 'infinite layer' (Ca, Sr)CuO2 thin films grown over a large range of growth conditions are insulators, while superconductivity is observed in Sr1-yNdyCuO2 films with Tc(onset)approx.28K for y=0.10. A Nd solubility limit of y=0.10 is observed with the appearance of a new phase with capprox.0.37nm for y>0.10. In addition, the transport and structural properties of Sr1-xCuO2-δ thin films grown by pulsed-laser deposition support the contention that the tetragonal phase is capable of accommodating a significant density of alkaline-earth deficiencies up to x≥0.3. Resistivity measurements indicate a significant change in the carrier density of the CuO2 planes as Sr vacancies are introduced. In addition, an enigmatic anomaly in resistivity at 185K is observed for Sr0.85CuO2-δ thin films. Magnetic measurements on these samples indicate that, although a significant drop in resistivity at 185K is observed, it is not due to a superconducting transition. Hall measurements, as well as changes in resistivity with film growth conditions, suggest that the majority carriers in these Sr1-xCuO2-δ thin films are electrons even with the Sr-vacancies present.

AB - We have studied the transport and structural properties of (Ca, Sr)CuO2, Sr1-yNdyCuO2, and Sr1-x CuO2-δ thin films grown by pulsed-laser deposition. Stoichiometric 'infinite layer' (Ca, Sr)CuO2 thin films grown over a large range of growth conditions are insulators, while superconductivity is observed in Sr1-yNdyCuO2 films with Tc(onset)approx.28K for y=0.10. A Nd solubility limit of y=0.10 is observed with the appearance of a new phase with capprox.0.37nm for y>0.10. In addition, the transport and structural properties of Sr1-xCuO2-δ thin films grown by pulsed-laser deposition support the contention that the tetragonal phase is capable of accommodating a significant density of alkaline-earth deficiencies up to x≥0.3. Resistivity measurements indicate a significant change in the carrier density of the CuO2 planes as Sr vacancies are introduced. In addition, an enigmatic anomaly in resistivity at 185K is observed for Sr0.85CuO2-δ thin films. Magnetic measurements on these samples indicate that, although a significant drop in resistivity at 185K is observed, it is not due to a superconducting transition. Hall measurements, as well as changes in resistivity with film growth conditions, suggest that the majority carriers in these Sr1-xCuO2-δ thin films are electrons even with the Sr-vacancies present.

UR - http://www.scopus.com/inward/record.url?scp=1042269362&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:1042269362

SN - 0366-9092

VL - 58

SP - 69

EP - 73

JO - Denshi Gijutsu Sogo Kenkyusho Iho/Bulletin of the Electrotechnical Laboratory

JF - Denshi Gijutsu Sogo Kenkyusho Iho/Bulletin of the Electrotechnical Laboratory

IS - 6

T2 - Proceedings of ETL Workshop on High Temperature Superconductors

Y2 - 6 December 1993 through 8 December 1993

ER -

Properties of doped and undoped (Ca,Sr)CuO₂ thin films

Abstract

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