TY - JOUR
T1 - Phase transition temperatures determined by different experimental methods
T2 - Si (111 ) 4×1-In surface with defects
AU - Shibasaki, Takahide
AU - Nagamura, Naoka
AU - Hirahara, Toru
AU - Okino, Hiroyuki
AU - Yamazaki, Shiro
AU - Lee, Woosang
AU - Shim, Hyungjoon
AU - Hobara, Rei
AU - Matsuda, Iwao
AU - Lee, Geunseop
AU - Hasegawa, Shuji
PY - 2010/1/11
Y1 - 2010/1/11
N2 - The role of defects in the metal-insulator transition of a quasi-one-dimensional metallic surface Si (111) 4×1-In, is investigated by temperature-dependent reflection high-energy electron diffraction (RHEED) spot analysis and microfour-point-probe (MFPP) surface conductivity measurements. In the RHEED spot intensity analysis, we found that adsorption of hydrogen or indium decreases the structural transition temperature into the 8×2 phase whereas it increases in the case of oxygen adsorption. In the MFPP, however, the metal-insulator transition temperature increased compared to that of the pristine surface universally irrespective of the additional atoms adsorbed as defects. The discrepancy between the two methods is discussed in terms of how the defects influence the metallic percolation path and formation of long-range order across the one-dimensional chains. Our results indicate that proper care should be taken concerning what each experimental method monitors when discussing phase transition phenomenon with various techniques.
AB - The role of defects in the metal-insulator transition of a quasi-one-dimensional metallic surface Si (111) 4×1-In, is investigated by temperature-dependent reflection high-energy electron diffraction (RHEED) spot analysis and microfour-point-probe (MFPP) surface conductivity measurements. In the RHEED spot intensity analysis, we found that adsorption of hydrogen or indium decreases the structural transition temperature into the 8×2 phase whereas it increases in the case of oxygen adsorption. In the MFPP, however, the metal-insulator transition temperature increased compared to that of the pristine surface universally irrespective of the additional atoms adsorbed as defects. The discrepancy between the two methods is discussed in terms of how the defects influence the metallic percolation path and formation of long-range order across the one-dimensional chains. Our results indicate that proper care should be taken concerning what each experimental method monitors when discussing phase transition phenomenon with various techniques.
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U2 - 10.1103/PhysRevB.81.035314
DO - 10.1103/PhysRevB.81.035314
M3 - Article
AN - SCOPUS:77954825880
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 3
M1 - 035314
ER -