Nanoscale disorder in high critical field, carbon-doped MgB2 hybrid physical-chemical vapor deposition thin films

Y. Zhu; D. C. Larbalestier; P. M. Voyles; A. V. Pogrebnyakov; X. X. Xi; J. M. Redwing

doi:10.1063/1.2775088

Nanoscale disorder in high critical field, carbon-doped MgB₂ hybrid physical-chemical vapor deposition thin films

Y. Zhu, D. C. Larbalestier, P. M. Voyles, A. V. Pogrebnyakov, X. X. Xi, J. M. Redwing

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Abstract

Carbon-doped Mg B2 thin films deposited by hybrid physical-chemical vapor deposition (HPCVD) can have Hc2 (0 K) ∼70 T, anomalously high compared to bulk samples which have Hc2 about half this value. Using transmission electron microscopy, the authors show that the carbon content in HPCVD-grown Mg (B1-x Cx) 2 grains is x≤5%, and that most carbon forms an amorphous intergranular phase. The authors also find extensive structural disorder, including rotations about the c axis and small tilts of the c axis, with a domain size of 5-20 nm. The authors propose that strong electron scattering from the nanoscale disorder is responsible for the very high Hc2 in such films.

Original language	English (US)
Article number	082513
Journal	Applied Physics Letters
Volume	91
Issue number	8
DOIs	https://doi.org/10.1063/1.2775088
State	Published - 2007

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2775088

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@article{04f3950e23094c8b8e448411c87555de,

title = "Nanoscale disorder in high critical field, carbon-doped MgB2 hybrid physical-chemical vapor deposition thin films",

abstract = "Carbon-doped Mg B2 thin films deposited by hybrid physical-chemical vapor deposition (HPCVD) can have Hc2 (0 K) ∼70 T, anomalously high compared to bulk samples which have Hc2 about half this value. Using transmission electron microscopy, the authors show that the carbon content in HPCVD-grown Mg (B1-x Cx) 2 grains is x≤5%, and that most carbon forms an amorphous intergranular phase. The authors also find extensive structural disorder, including rotations about the c axis and small tilts of the c axis, with a domain size of 5-20 nm. The authors propose that strong electron scattering from the nanoscale disorder is responsible for the very high Hc2 in such films.",

author = "Y. Zhu and Larbalestier, {D. C.} and Voyles, {P. M.} and Pogrebnyakov, {A. V.} and Xi, {X. X.} and Redwing, {J. M.}",

note = "Funding Information: The authors thank Jinsong Wu and Alex Gurevich for helpful discussions, and acknowledge support from the NSF FRG on Mg B 2 (DMR 0514592). Work at Penn State was supported in part by NSF [DMR-0306746 for two of the authors (X.X.X. and J.M.R.)] and ONR [N00014-00-1-0294 for one of the authors (X.X.X.) and N0014-01-1-0006 for another author (J.M.R)]. ",

year = "2007",

doi = "10.1063/1.2775088",

language = "English (US)",

volume = "91",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "8",

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T1 - Nanoscale disorder in high critical field, carbon-doped MgB2 hybrid physical-chemical vapor deposition thin films

AU - Zhu, Y.

AU - Larbalestier, D. C.

AU - Voyles, P. M.

AU - Pogrebnyakov, A. V.

AU - Xi, X. X.

AU - Redwing, J. M.

N1 - Funding Information: The authors thank Jinsong Wu and Alex Gurevich for helpful discussions, and acknowledge support from the NSF FRG on Mg B 2 (DMR 0514592). Work at Penn State was supported in part by NSF [DMR-0306746 for two of the authors (X.X.X. and J.M.R.)] and ONR [N00014-00-1-0294 for one of the authors (X.X.X.) and N0014-01-1-0006 for another author (J.M.R)].

PY - 2007

Y1 - 2007

N2 - Carbon-doped Mg B2 thin films deposited by hybrid physical-chemical vapor deposition (HPCVD) can have Hc2 (0 K) ∼70 T, anomalously high compared to bulk samples which have Hc2 about half this value. Using transmission electron microscopy, the authors show that the carbon content in HPCVD-grown Mg (B1-x Cx) 2 grains is x≤5%, and that most carbon forms an amorphous intergranular phase. The authors also find extensive structural disorder, including rotations about the c axis and small tilts of the c axis, with a domain size of 5-20 nm. The authors propose that strong electron scattering from the nanoscale disorder is responsible for the very high Hc2 in such films.

AB - Carbon-doped Mg B2 thin films deposited by hybrid physical-chemical vapor deposition (HPCVD) can have Hc2 (0 K) ∼70 T, anomalously high compared to bulk samples which have Hc2 about half this value. Using transmission electron microscopy, the authors show that the carbon content in HPCVD-grown Mg (B1-x Cx) 2 grains is x≤5%, and that most carbon forms an amorphous intergranular phase. The authors also find extensive structural disorder, including rotations about the c axis and small tilts of the c axis, with a domain size of 5-20 nm. The authors propose that strong electron scattering from the nanoscale disorder is responsible for the very high Hc2 in such films.

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ER -

Nanoscale disorder in high critical field, carbon-doped MgB₂ hybrid physical-chemical vapor deposition thin films

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