Zobrazeno 1 - 10
of 213
pro vyhledávání: '"J. Piroto Duarte"'
Autor:
Stephen P. Cottrell, R. L. Lichti, R. C. Vilão, S. F. J. Cox, N. Ayres de Campos, H. V. Alberto, Benilde F.O. Costa, J. Piroto Duarte, Kim H. Chow, João Gil, A. Weidinger
Publikováno v:
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
We have investigated a single crystal of the wide bandgap II–VI semiconductor ZnSe. The sample was highly resistive due to heavy compensation of this n-type semiconductor. In low transverse fields, clear signs of conversion from a paramagnetic to a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a7ecc123020e6536b519bc795f9b0543
https://doi.org/10.1016/j.physb.2008.11.144
https://doi.org/10.1016/j.physb.2008.11.144
Autor:
H. V. Alberto, Daniel Vanmaekelbergh, Jacob Gavartin, J. Piroto Duarte, James S. Lord, Peter Liljeroth, S. F. J. Cox, Arjan J. Houtepen, N. Ayres de Campos, R. C. Vilão, João Gil
Publikováno v:
Physica B: Condensed Matter. 404:837-840
The effect of quantum confinement on shallow-donor muonium states and their ionization in nanocrystalline colloidal II–VI semiconductors was studied by the transverse- and longitudinal-field μSR techniques. Evidence is found for the formation of s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9520cef17280dc05d3b9a3ef47805ee9
https://doi.org/10.1016/j.physb.2008.11.158
https://doi.org/10.1016/j.physb.2008.11.158
Autor:
João Gil, J. Piroto Duarte, Kim H. Chow, A. Weidinger, Stephen J. Cox, N. Ayres de Campos, R. C. Vilão, H. V. Alberto, R. L. Lichti
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 580:438-441
Muonium spectroscopy experiments are used to obtain detailed microscopic information about the electronic structure of the muonium impurity in II–VI compound semiconductors, used as model for isolated hydrogen. Donor and acceptor configurations are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d927a622189b1775bf285e7c1be56182
https://doi.org/10.1016/j.nima.2007.05.072
https://doi.org/10.1016/j.nima.2007.05.072
Autor:
E.A. Davis, R. C. Vilão, Amit Keren, Stephen J. Cox, James S. Lord, David J. Keeble, M. Charlton, D. P. van der Werf, J. Piroto Duarte, Jacob Gavartin, Robert Scheuermann, Alexey Stoykov, Stephen P. Cottrell, João Gil, H. V. Alberto
Publikováno v:
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
A new survey of muonium states brings the total of binary non-magnetic oxides studied to 30, with normal muonium--the interstitially trapped atomic state--found in 15 of these. The number of shallow-donor states of the type known in ZnO now also tota
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7fd10932a71bd0617f15bcad5ec71733
https://doi.org/10.1016/j.physb.2005.11.106
https://doi.org/10.1016/j.physb.2005.11.106
Autor:
Stephen J. Cox, H. V. Alberto, J. Piroto Duarte, R. L. Lichti, João Gil, Kim H. Chow, Stephen P. Cottrell, R. C. Vilão, A. Weidinger, N. Ayres de Campos
Publikováno v:
Physica B: Condensed Matter. :383-386
A systematic experimental study of muonium states in the binary compounds ZnSe, ZnS and ZnTe is presented. Deep muonium states are observed in ZnSe and ZnS but not in ZnTe. In ZnTe, only the diamagnetic signal is seen. The temperature dependence of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::11e26391498555016a915285e0d44380
https://doi.org/10.1016/j.physb.2005.11.107
https://doi.org/10.1016/j.physb.2005.11.107
Autor:
Stephen J. Cox, James S. Lord, R. C. Vilão, Jacob Gavartin, David J. Keeble, J. Piroto Duarte, N. Ayres de Campos, Stephen P. Cottrell, D. P. van der Werf, E.A. Davis, M. Charlton, H. V. Alberto, João Gil
Publikováno v:
Journal of Physics: Condensed Matter. 18:1079-1119
Following the prediction and confirmation that interstitial hydrogen forms shallow donors in zinc oxide, inducing electronic conductivity, the question arises as to whether it could do so in other oxides, not least in those under consideration as thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9511adfa548a0448edfd1a9ca5d7d532
https://doi.org/10.1088/0953-8984/18/3/022
https://doi.org/10.1088/0953-8984/18/3/022
Publikováno v:
Journal of Physics: Condensed Matter. 16:S4707-S4720
The discovery and significance of weakly bound muonium states with low hyperfine constants in a number of compound semiconductors of the II–VI and III–V (nitride) families are briefly reviewed. With ionization energies of several tens of meV, the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6b4a842b26024715012cdfaab538dbe
https://doi.org/10.1088/0953-8984/16/40/015
https://doi.org/10.1088/0953-8984/16/40/015
Autor:
M. V. Yakushev, N. Ayres de Campos, R. C. Vilão, João Gil, Alois Weidinger, H. V. Alberto, J. Piroto Duarte
Publikováno v:
Physica B: Condensed Matter. :965-968
Implanted positive muons, used to mimic protons, are observed to form a diamagnetic state in the chalcopyrite semiconductor CuInSe2. A shift of the muon precession frequency is observed at a high transverse magnetic field (1600 G) and is interpreted
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1348071ac457e0fe8534f1036e1ad28c
https://doi.org/10.1016/j.physb.2003.09.199
https://doi.org/10.1016/j.physb.2003.09.199
Autor:
N. Ayres de Campos, Stephen J. Cox, M. V. Yakushev, João Gil, Alois Weidinger, R. C. Vilão, H. V. Alberto, J. Piroto Duarte
Publikováno v:
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
The diffusion parameters of diamagnetic muons in chalcopyrites CuInSe2, CuInS2, CuInTe2, CuGaTe2 and (Ag0.25Cu0.75)InSe2 were obtained by [mu]SR methods. The variations among the different compositions were found to validate the anion-antibonding loc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e00a23ea86d44d5e39b5d84edeb92b1
https://doi.org/10.1016/s0921-4526(02)01598-3
https://doi.org/10.1016/s0921-4526(02)01598-3
Autor:
N. Ayres de Campos, H. V. Alberto, Stephen J. Cox, João Gil, Alois Weidinger, R. C. Vilão, J. Piroto Duarte
Publikováno v:
Physica B: Condensed Matter. 326:124-127
Information on the properties of the possible muonium states in II–VI semiconductor compounds is obtained in this study. In these materials, muonium may either form a shallow donor state, which is characterized by a small hyperfine interaction and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69705298189ff54c3ed29b62a92e6ef9
https://doi.org/10.1016/s0921-4526(02)01594-6
https://doi.org/10.1016/s0921-4526(02)01594-6