Details
| Original language | English |
|---|---|
| Article number | 174108 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 77 |
| Issue number | 17 |
| Publication status | Published - 13 May 2008 |
Abstract
By using quantitative low energy electron diffraction, we have studied the temperature-driven phase transition of Pb chains grown on Si(557) substrates at a surface concentration of 1.3 ML. This concentration, which is still below one physical monolayer, exhibits a unique switching of electrical conductance from one dimensional to two dimensional above 78 K, which is coupled to this phase transition, and was investigated for this reason. Annealing to 640 K causes a concentration-driven refacetting of the whole surface into large (223) facets at low temperatures, while along the chains a so-called (1,5) linear phase is formed, causing a tenfold periodicity. At Tc =78 K, we analyze a temperature-driven order-order transition along the [1̄ 1̄ 2] direction in detail, which again turns out to be a refacetting transition. The two-dimensional character of this transition was seen by corresponding structural changes along the [1 1̄ 0] direction as well. Refacetting causes a change in periodicity and destroys the conditions of Fermi nesting necessary for one-dimensional conductance.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 17, 174108, 13.05.2008.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Temperature-driven refacetting phase transition in Pb chains on Si(557)
AU - Czubanowski, Marcin
AU - Schuster, A.
AU - Pfnür, Herbert
AU - Tegenkamp, Christoph
PY - 2008/5/13
Y1 - 2008/5/13
N2 - By using quantitative low energy electron diffraction, we have studied the temperature-driven phase transition of Pb chains grown on Si(557) substrates at a surface concentration of 1.3 ML. This concentration, which is still below one physical monolayer, exhibits a unique switching of electrical conductance from one dimensional to two dimensional above 78 K, which is coupled to this phase transition, and was investigated for this reason. Annealing to 640 K causes a concentration-driven refacetting of the whole surface into large (223) facets at low temperatures, while along the chains a so-called (1,5) linear phase is formed, causing a tenfold periodicity. At Tc =78 K, we analyze a temperature-driven order-order transition along the [1̄ 1̄ 2] direction in detail, which again turns out to be a refacetting transition. The two-dimensional character of this transition was seen by corresponding structural changes along the [1 1̄ 0] direction as well. Refacetting causes a change in periodicity and destroys the conditions of Fermi nesting necessary for one-dimensional conductance.
AB - By using quantitative low energy electron diffraction, we have studied the temperature-driven phase transition of Pb chains grown on Si(557) substrates at a surface concentration of 1.3 ML. This concentration, which is still below one physical monolayer, exhibits a unique switching of electrical conductance from one dimensional to two dimensional above 78 K, which is coupled to this phase transition, and was investigated for this reason. Annealing to 640 K causes a concentration-driven refacetting of the whole surface into large (223) facets at low temperatures, while along the chains a so-called (1,5) linear phase is formed, causing a tenfold periodicity. At Tc =78 K, we analyze a temperature-driven order-order transition along the [1̄ 1̄ 2] direction in detail, which again turns out to be a refacetting transition. The two-dimensional character of this transition was seen by corresponding structural changes along the [1 1̄ 0] direction as well. Refacetting causes a change in periodicity and destroys the conditions of Fermi nesting necessary for one-dimensional conductance.
UR - http://www.scopus.com/inward/record.url?scp=43949135210&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.77.174108
DO - 10.1103/PhysRevB.77.174108
M3 - Article
AN - SCOPUS:43949135210
VL - 77
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 17
M1 - 174108
ER -