Isotopic substitution of boron and carbon in superconducting diamond epilayers grown by MPCVD

被引：16

作者：

Achatz, P. ^{[1
,2
]}

Omnes, F. ^{[1
]}

Ortega, L. ^{[1
]}

Marcenat, C. ^{[2
]}

Vacik, J. ^{[3
]}

Hnatowicz, V. ^{[3
]}

Koester, U. ^{[4
]}

Jomard, F. ^{[5
,6
]}

Bustarret, E. ^{[1
]}

机构：

[1] CNRS, Inst Neel, F-38042 Grenoble 9, France

[2] CEA, INAC, SPSMS, F-38054 Grenoble 9, France

[3] AS CR & Res Ctr, Inst Nucl Phys, Rez 25068, Czech Republic

[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[5] CNRS, GEMaC, F-92195 Meudon, France

[6] UVSQ, F-92195 Meudon, France

来源：

关键词：

Isotopic effects; Vibrational properties; p-type doping; Superconductivity; Diamond epilayers; DOPED DIAMOND; RAMAN-SPECTRA; FILMS;

D O I：

10.1016/j.diamond.2010.01.052

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Sets of heavily boron-doped {100}-oriented diamond epilayers have been grown by MPCVD from isotope-enriched gases such as (13)CH(4) and (10)B(2)H(6) or (13)CH(4) and naturally abundant (11)B(2)H(6), and the resulting concentration profiles of the various boron isotopes were measured by SIMS. In the particular case of the (13)C(10)B set, the high absorption cross section of (10)B made neutron depth profiling possible for this element. The vibrational and superconducting properties of these epilayers were compared to those of films grown from gases containing the isotopes in their natural abundance. The critical temperature T(c) values were found to be lower both in the (13)C(11)B and (13)C(10)B sets, as expected for a conventional pairing mechanism mediated by phonons. In good agreement with recent studies, the isotope-effect coefficient for Tc was found to be much higher than the classical 0.5 value. Various origins for this behaviour are suggested. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：814 / 817

页数：4

共 21 条

[1] About the origin of the low wave number structures of the Raman spectra of heavily boron doped diamond films [J].

Bernard, M ;

Baron, C ;

Deneuville, A .

[2] USE OF NEUTRON-INDUCED REACTIONS FOR LIGHT-ELEMENT PROFILING AND LATTICE LOCALIZATION [J].

BIERSACK, JP ;

FINK, D ;

HENKELMANN, R ;

MULLER, K .

NUCLEAR INSTRUMENTS & METHODS, 1978, 149 (1-3) :93-97

[3] Impurity dimers in superconducting B-doped diamond:: Experiment and first-principles calculations [J].

Bourgeois, E. ;

Bustarret, E. ;

Achatz, P. ;

Omnes, F. ;

Blase, X. .

PHYSICAL REVIEW B, 2006, 74 (09)

[4] Superconducting diamond: an introduction [J].

Bustarret, E. .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2008, 205 (05) :997-1008

[5] Dependence of the superconducting transition temperature on the doping level in single-crystalline diamond films [J].

Bustarret, E ;

Kacmarcik, J ;

Marcenat, C ;

Gheeraert, E ;

Cytermann, C ;

Marcus, J ;

Klein, T .

PHYSICAL REVIEW LETTERS, 2004, 93 (23)

[6] Optical and electronic properties of heavily boron-doped homo-epitaxial diamond [J].

Bustarret, E ;

Gheeraert, E ;

Watanabe, K .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2003, 199 (01) :9-18

[7] MODIFICATION OF THE ISOTOPE EFFECT DUE TO PAIR BREAKING [J].

CARBOTTE, JP ;

GREESON, M ;

PEREZGONZALEZ, A .

PHYSICAL REVIEW LETTERS, 1991, 66 (13) :1789-1792

[8] Large carbon-isotope shift of TC in boron-doped diamond [J].

Dubrovinskaia, Natalia ;

Dubrovinsky, Leonid ;

Papageorgiou, Thomas ;

Bosak, Alexey ;

Krisch, Michael ;

Braun, Hans F. ;

Wosnitza, Joachim .

APPLIED PHYSICS LETTERS, 2008, 92 (13)

[9] Superconductivity in diamond [J].

Ekimov, EA ;

Sidorov, VA ;

Bauer, ED ;

Mel'nik, NN ;

Curro, NJ ;

Thompson, JD ;

Stishov, SM .

NATURE, 2004, 428 (6982) :542-545

[10] Structure and superconductivity of isotope-enriched boron-doped diamond [J].

Ekimov, Evgeny A. ;

Sidorov, Vladimir A. ;

Zoteev, Andrey V. ;

Lebed, Julia B. ;

Thompson, Joe D. ;

Stishov, Sergey M. .

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2008, 9 (04)

← 1 2 3 →