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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F10%3A00346854" target="_blank" >RIV/61389005:_____/10:00346854 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/26722445:_____/10:#0000573

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

Sets of heavily boron-doped {100}-oriented diamond epilayers have been grown by MPCVD from isotope-enriched gases such as (CH4)-C-13 and (B2H6)-B-10 or (CH4)-C-13 and naturally abundant (B2H6)-B-11, and the resulting concentration profiles of the variousboron isotopes were measured by SIMS. In the particular case of the (CB)-C-13-B-10 set, the high absorption cross section of B-10 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 (CB)-C-13-B-11 and (CB)-C-13-B-10 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

Sets of heavily boron-doped {100}-oriented diamond epilayers have been grown by MPCVD from isotope-enriched gases such as (CH4)-C-13 and (B2H6)-B-10 or (CH4)-C-13 and naturally abundant (B2H6)-B-11, and the resulting concentration profiles of the variousboron isotopes were measured by SIMS. In the particular case of the (CB)-C-13-B-10 set, the high absorption cross section of B-10 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 (CB)-C-13-B-11 and (CB)-C-13-B-10 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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

<a href="/cs/project/KAN400480701" target="_blank" >KAN400480701: Nanostruktury na bázi uhlíku a polymerů pro využití v bioelektronice a v medicíně</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Diamond and Related Materials

ISSN

0925-9635

e-ISSN

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Svazek periodika

19

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

4

Strana od-do

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Kód UT WoS článku

000279229700025

EID výsledku v databázi Scopus

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