We report on the observation of a negative magnetoresistance (NMR) regime in boron-doped nanocrystalline diamond films at low temperatures. A comparative analysis of our experimental results and those reported for systems composed of superconducting granules embedded in an insulating matrix (also referred as granular films) suggest the presence of superconducting regions inside the insulating films as causing the NMR. By considering the latter scenario, the experimental observations are explained by modeling the systems as consisting of a distribution of superconducting granules whose global properties are tuned by the intergrain distance.
REFERENCES
1.
M.
Stoneham
, Nature Mater.
3
, 3
(2004
).2.
H.
Ye
, N.
Tumilty
, M.
Bevilacqua
, S.
Curat
, M.
Nesladek
, B.
Bazin
, P.
Bergonzo
, and R. B.
Jackman
, J. Appl. Phys.
103
, 054503
(2008
).3.
O. A.
Williams
, M.
Nesladek
, M.
Daenen
, S.
Michaelson
, A.
Hoffman
, E.
Osawa
, K.
Haenen
, and R. B.
Jackman
, Diamond Relat. Mater.
17
, 1080
(2008
).4.
J. J.
Mareš
, P.
Hubík
, J.
Krištofik
, D.
Kindl
, M.
Fanta
, M.
Nesládek
, O.
Williams
, and D. M.
Gruen
, Appl. Phys. Lett.
88
, 092107
(2006
).5.
Y.
Aharonov
and D.
Bohm
, Phys. Rev.
115
, 485
(1959
).6.
T. C.
Choy
, A. M.
Stoneham
, M.
Ortuño
, and A. M.
Somoza
, Appl. Phys. Lett.
92
, 012120
(2008
).7.
V. L.
Nguyen
, B. Z.
Spivak
, and E.
Shklovskii
, Pis'ma Zh. Eksp. Teor. Fiz.
41
, 35
(1985
)Zh. Eksp. Teor. Fiz.
89
, 11
(1985
)[
Sov. Phys. JETP
62
, 1021
(1985
)].8.
B. I.
Shklovskii
and B. Z.
Spivak
, in Hopping and Related Phenomena
, edited by H.
Fritzsche
and M.
Pollack
(World Scientific
, Singapore
, 1990
), p. 139
.9.
O. A.
Williams
, O.
Douhéret
, M.
Daenen
, K.
Haenen
, E.
Osawa
, and M.
Takahashi
, Chem. Phys. Lett.
4457
, 255
(2007
).10.
H. M.
Jaeger
, D. B.
Haviland
, B. G.
Orr
, and A. M.
Goldman
, Phys. Rev. B
40
, 182
(1989
).11.
Y.
Shapira
and G.
Deutscher
, Phys. Rev. B
27
, 4463
(1983
).12.
K.
Kagawa
, K.
Inagaki
, and S.
Tanda
, Phys. Rev. B
53
, R2979
(1996
).13.
C. A. M.
dos Santos
, C. J. V.
Oliveira
, M. S.
da Luz
, A. D.
Bortolozo
, M. J. R.
Sandim
, and A. J. S.
Machado
, Phys. Rev. B
74
, 184526
(2006
).14.
W.
Gajewski
, P.
Achatz
, O. A.
Williams
, K.
Haenen
, E.
Bustarret
, M.
Stutzmann
, and J. A.
Garrido
, Phys. Rev. B
79
, 045206
(2009
).15.
S.
Kobayashi
, in Localization, Interaction, and Transport Phenomena
, edited by B.
Kramer
, G.
Bergmann
, and Y.
Bruynseraede
(Springer-Verlag
, Berlin
, 1985
), p. 18
.16.
T.
Tshepe
, C.
Kasl
, J. F.
Prins
, and M. J. R.
Hoch
, Phys. Rev. B
70
, 245107
(2004
).17.
B. I.
Shklovskii
and A. L.
Efros
, in Electronic Properties of Doped Semiconductors
, Springer Series in Solid-State Sciences Vol. 45
(Springer-Verlag
, Berlin
, 1984
).18.
M. A.
Paalanen
, A. F.
Hebard
, and R. R.
Ruel
, Phys. Rev. Lett.
69
, 1604
(1992
).19.
Y. M.
Strelniker
, A.
Frydman
, and S.
Havlin
, Phys. Rev. B
76
, 224528
(2007
).20.
B. L.
Willems
, V. H.
Dao
, J.
Vanacken
, L. F.
Chibotaru
, V. V.
Moshchalkov
, I.
Guillamön
, H.
Suderow
, S.
Vieira
, S. D.
Janssens
, O. A.
Williams
, K.
Haenen
, and P.
Wagner
(unpublished).21.
For the case of diamond films prepared by chemical vapor deposition (CVD) methods, the experimental values for have been found to be between (Refs. 14 and 22) and .
22.
T.
Klein
, P.
Achatz
, J.
Kacmarcik
, C.
Marcenat
, F.
Gustafsson
, J.
Marcus
, E.
Bustarret
, J.
Pernot
, F.
Omnes
, B. E.
Sernelius
, C.
Persson
, A.
Ferreira da Silva
, and C.
Cytermann
, Phys. Rev. B
75
, 165313
(2007
).23.
A.
Gerber
, A.
Milner
, G.
Deutscher
, M.
Karpovsky
, and A.
Gladkikh
, Phys. Rev. Lett.
78
, 4277
(1997
).24.
T. I.
Baturina
, A. Yu.
Mironov
, V. M.
Vinokur
, M. R.
Baklanov
, and C.
Strunk
, Phys. Rev. Lett.
99
, 257003
(2007
);
[PubMed]
B.
Sacépé
, C.
Chapelier
, T. I.
Baturina
, V. M.
Vinokur
, M. R.
Baklanov
, and M.
Sanquer
, Phys. Rev. Lett.
101
, 157006
(2008
).
[PubMed]
25.
I. S.
Beloborodov
and K. B.
Efetov
, Phys. Rev. Lett.
82
, 3332
(1999
).26.
27.
A. A.
Abrikosov
, Fundamentals of the Theory of Metals
(North-Holland
, Amsterdam
, 1988
).© 2009 American Institute of Physics.
2009
American Institute of Physics
You do not currently have access to this content.
