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- Laube, M., et al.
(författare)
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Electrical activation of high concentrations of N+ and P+ ions implanted into 4H-SiC
- 2002
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Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 92:1, s. 549-554
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Tidskriftsartikel (refereegranskat)abstract
- Comparative Hall effect investigations are conducted on N- and P-implanted as well as on (N+P)-coimplanted 4H-SiC epilayers. Box profiles with three different mean concentrations ranging from 2.5x10(18) to 3x10(20) cm(-3) to a depth of 0.8 mum are implanted at 500 degreesC into the (0001)-face of the initially p-type (Al-doped) epilayers. Postimplantation anneals at 1700 degreesC for 30 min are conducted to electrically activate the implanted N+ and P+ ions. Our systematic Hall effect investigations demonstrate that there is a critical donor concentration of (2-5)x10(19) cm(-3). Below this value, N- and P-donors result in comparable sheet resistances. The critical concentration represents an upper limit for electrically active N donors, while P donors can be activated at concentrations above 10(20) cm(-3). This high concentration of electrically active P donors is responsible for the observed low sheet resistance of 35 Omega/square, which is about one order of magnitude lower than the minimum sheet resistance achieved by N implantation.
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- Goll, G., et al.
(författare)
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conInvestigation of Sr2RuO4-Pt tacts in an applied magnetic field
- 2004
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853. ; 272:SUPPL. 1, s. E197-E198
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Tidskriftsartikel (refereegranskat)abstract
- We investigated the spin-triplet superconductor Sr 2 RuO 4 by means of conductance measurements of normal conductor/ superconductor point contacts. We present results that show a linear dependence of the excess current as a function of temperature and applied magnetic fields over a wide range of the phase diagram. Applying a magnetic field larger than the upper critical field B c2 suppresses completely the features related to superconductivity and a conductance minimum at V = 0 occurs which becomes more pronounced with increasing field and persists even above T c up to several K. © 2003 Elsevier B.V. All rights reserved.
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