Structural relaxation of adlayers in the presence of adsorbate-induced reconstruction: C60/Cu(111)

Woei Wu Pai, Ching Ling Hsu, Ming-Chieh Lin, K. C. Lin, T. B. Tang

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

We revisit submonolayer growth of C60 on Cu(111) by scanning tunneling microscopy (STM), with emphasis on the formation of higher-order commensurate metastable states. These phases show concomitant interfacial reconstruction, adlayer buckling, and adlayer rotation in order to match as closely as possible the 10.0 Å C60 nearest neighbor (NN) distance. Most interestingly, a clear correlation between the adlayer rotation angle and molecular contrast patterns is demonstrated. This is caused by the C60-induced reconstruction at preferred binding sites and adlayer buckling in adjustment to strain. Four contrast patterns, i.e., “disordered maze,” “linear-wall maze,” “p(√7 × √7), ” and “p(2 × 2), ” with increasing C60 NN distances are categorized. In the most compressed phase, buckling is favored and it is analogous to the ground state of a strongly-coupled antiferromagnetic system on a triangular lattice with alike adlayer buckling and interfacial corrugation. In contrast, the molecular orderings in the other structures are mostly dictated by lateral displacements of C60 toward preferred reconstructive binding sites. These metastable phases thus illustrate structural relaxation of a molecular layer on an adsorbate-induced reconstructed substrate in different adsorbate-adsorbate and adsorbate-substrate interaction limits.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number12
DOIs
StatePublished - 2004 Mar 15

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Structural relaxation
Adsorbates
buckling
Buckling
Binding sites
Binding Sites
Metastable phases
Scanning tunneling microscopy
Substrates
metastable state
Ground state
scanning tunneling microscopy
adjusting
ground state
interactions

Cite this

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title = "Structural relaxation of adlayers in the presence of adsorbate-induced reconstruction: C60/Cu(111)",
abstract = "We revisit submonolayer growth of C60 on Cu(111) by scanning tunneling microscopy (STM), with emphasis on the formation of higher-order commensurate metastable states. These phases show concomitant interfacial reconstruction, adlayer buckling, and adlayer rotation in order to match as closely as possible the 10.0 {\AA} C60 nearest neighbor (NN) distance. Most interestingly, a clear correlation between the adlayer rotation angle and molecular contrast patterns is demonstrated. This is caused by the C60-induced reconstruction at preferred binding sites and adlayer buckling in adjustment to strain. Four contrast patterns, i.e., “disordered maze,” “linear-wall maze,” “p(√7 × √7), ” and “p(2 × 2), ” with increasing C60 NN distances are categorized. In the most compressed phase, buckling is favored and it is analogous to the ground state of a strongly-coupled antiferromagnetic system on a triangular lattice with alike adlayer buckling and interfacial corrugation. In contrast, the molecular orderings in the other structures are mostly dictated by lateral displacements of C60 toward preferred reconstructive binding sites. These metastable phases thus illustrate structural relaxation of a molecular layer on an adsorbate-induced reconstructed substrate in different adsorbate-adsorbate and adsorbate-substrate interaction limits.",
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Structural relaxation of adlayers in the presence of adsorbate-induced reconstruction : C60/Cu(111). / Pai, Woei Wu; Hsu, Ching Ling; Lin, Ming-Chieh; Lin, K. C.; Tang, T. B.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 69, No. 12, 15.03.2004.

Research output: Contribution to journalArticle

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AB - We revisit submonolayer growth of C60 on Cu(111) by scanning tunneling microscopy (STM), with emphasis on the formation of higher-order commensurate metastable states. These phases show concomitant interfacial reconstruction, adlayer buckling, and adlayer rotation in order to match as closely as possible the 10.0 Å C60 nearest neighbor (NN) distance. Most interestingly, a clear correlation between the adlayer rotation angle and molecular contrast patterns is demonstrated. This is caused by the C60-induced reconstruction at preferred binding sites and adlayer buckling in adjustment to strain. Four contrast patterns, i.e., “disordered maze,” “linear-wall maze,” “p(√7 × √7), ” and “p(2 × 2), ” with increasing C60 NN distances are categorized. In the most compressed phase, buckling is favored and it is analogous to the ground state of a strongly-coupled antiferromagnetic system on a triangular lattice with alike adlayer buckling and interfacial corrugation. In contrast, the molecular orderings in the other structures are mostly dictated by lateral displacements of C60 toward preferred reconstructive binding sites. These metastable phases thus illustrate structural relaxation of a molecular layer on an adsorbate-induced reconstructed substrate in different adsorbate-adsorbate and adsorbate-substrate interaction limits.

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