Valence band structure of the icosahedral Ag-In-Yb quasicrystal

Sharma, H R; Simutis, G; Dhanak, V R; Nugent, P J; McGrath, R; Cui, C; Shimoda, M; Tsai, A P; Ishii, Y

doi:10.1103/PHYSREVB.81.104205

Title: Valence band structure of the icosahedral Ag-In-Yb quasicrystal

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Abstract

The valence band structure of the icosahedral (i) Ag-In-Yb quasicrystal, which is isostructural to the binary i-Cd-Yb system, is investigated by ultraviolet photoemission spectroscopy (UPS). Experimental results are compared with electronic-structure calculations of a cubic approximant of the same phase. UPS spectra from the fivefold, threefold, and twofold i-Ag-In-Yb surfaces reveal that the valence band near to the Fermi level is dominated by Yb 4f-derived states, in agreement with calculations. The spectra also exhibit peaks which are surface core level shifted, caused by changes in the electronic structure in surface layers. Calculations yield a pseudogap in the density of states due to a hybridization of the Yb 5d band with the Ag 5p and In 5p bands. Both experimental and calculated band features are very similar to those of Cd-Yb. The modification of the band structure after surface treatment by sputtering and by oxidation is also studied. Additionally, the work function of i-Ag-In-Yb measured from the width of UPS spectrum is found to be almost unaffected by surface orientation, but increases after sputtering or oxidation.

Authors:

Sharma, H R; Simutis, G; Dhanak, V R; Nugent, P J; McGrath, R ^[1]; Cui, C ^[2]; Shimoda, M ^[3]; Tsai, A P ^[2]; Ishii, Y ^[4]

Surface Science Research Centre and Department of Physics, University of Liverpool, Liverpool L69 3BX (United Kingdom)
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan)
National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
Department of Physics, Chuo University, Kasuga, Tokyo 112-8551 (Japan)

Publication Date:: Mon Mar 01 00:00:00 EST 2010

OSTI Identifier:: 21366697

Resource Type:: Journal Article

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 81; Journal Issue: 10; Other Information: DOI: 10.1103/PhysRevB.81.104205; (c) 2010 The American Physical Society; Journal ID: ISSN 1098-0121

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; DENSITY; ELECTRONIC STRUCTURE; FERMI LEVEL; INDIUM COMPOUNDS; LAYERS; MODIFICATIONS; ORIENTATION; OXIDATION; PHOTOEMISSION; SILVER COMPOUNDS; SIMULATION; SPECTRA; SPECTROSCOPY; SPUTTERING; SURFACE TREATMENTS; SURFACES; ULTRAVIOLET RADIATION; VALENCE; WORK FUNCTIONS; YTTERBIUM COMPOUNDS; CHEMICAL REACTIONS; ELECTROMAGNETIC RADIATION; EMISSION; ENERGY LEVELS; FUNCTIONS; PHYSICAL PROPERTIES; RADIATIONS; RARE EARTH COMPOUNDS; SECONDARY EMISSION; TRANSITION ELEMENT COMPOUNDS

Citation Formats


                    Sharma, H R, Simutis, G, Dhanak, V R, Nugent, P J, McGrath, R, Cui, C, Shimoda, M, Tsai, A P, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, and Ishii, Y. Valence band structure of the icosahedral Ag-In-Yb quasicrystal.  United States: N. p., 2010. 
        Web.  doi:10.1103/PHYSREVB.81.104205.

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                    Sharma, H R, Simutis, G, Dhanak, V R, Nugent, P J, McGrath, R, Cui, C, Shimoda, M, Tsai, A P, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, & Ishii, Y. Valence band structure of the icosahedral Ag-In-Yb quasicrystal.  United States.  https://doi.org/10.1103/PHYSREVB.81.104205

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                    Sharma, H R, Simutis, G, Dhanak, V R, Nugent, P J, McGrath, R, Cui, C, Shimoda, M, Tsai, A P, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, and Ishii, Y. 2010.  
        "Valence band structure of the icosahedral Ag-In-Yb quasicrystal".  United States.  https://doi.org/10.1103/PHYSREVB.81.104205.

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@article{osti_21366697,

  title        = {Valence band structure of the icosahedral Ag-In-Yb quasicrystal},

  author       = {Sharma, H R and Simutis, G and Dhanak, V R and Nugent, P J and McGrath, R and Cui, C and Shimoda, M and Tsai, A P and National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 and Ishii, Y},

  abstractNote = {The valence band structure of the icosahedral (i) Ag-In-Yb quasicrystal, which is isostructural to the binary i-Cd-Yb system, is investigated by ultraviolet photoemission spectroscopy (UPS). Experimental results are compared with electronic-structure calculations of a cubic approximant of the same phase. UPS spectra from the fivefold, threefold, and twofold i-Ag-In-Yb surfaces reveal that the valence band near to the Fermi level is dominated by Yb 4f-derived states, in agreement with calculations. The spectra also exhibit peaks which are surface core level shifted, caused by changes in the electronic structure in surface layers. Calculations yield a pseudogap in the density of states due to a hybridization of the Yb 5d band with the Ag 5p and In 5p bands. Both experimental and calculated band features are very similar to those of Cd-Yb. The modification of the band structure after surface treatment by sputtering and by oxidation is also studied. Additionally, the work function of i-Ag-In-Yb measured from the width of UPS spectrum is found to be almost unaffected by surface orientation, but increases after sputtering or oxidation.},

  doi          = {10.1103/PHYSREVB.81.104205},

  url          = {https://www.osti.gov/biblio/21366697},
  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  issn         = {1098-0121},

  number       = 10,

  volume       = 81,

  place        = {United States},

  year         = {Mon Mar 01 00:00:00 EST 2010},

  month        = {Mon Mar 01 00:00:00 EST 2010}

}

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