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We investigate the adsorption and electronic properties of single cobalt atoms and clusters adsorbed on Rh (111) and Pd (111) with scanning tunneling microscopy and scanning tunneling spectrum (STM/STS). It is found that there are two apparent heights for individual cobalt atoms on Rh (111), corresponding to Co atoms adsorbed hcp and fcc hollow sites. The Co atoms on both sites exhibit a notable peak near the Fermi energy, and the two peaks have a slight difference in peak shape. By fitting the dI/dV spectrum to the Fano lineshape, we find that the peak cannot be simply ascribed to the Kondo model. The peak position and full width at half maximum of the peak suggest that the magnetic impurity is in the mixed-valence regime rather than in the Kondo regime. And the peak can be interpreted as a combination of the Kondo resonance and bare d resonance. For Co dimers and trimers on Rh (111), there is no observable feature in their dI/dV spectra near the Fermi level. This is speculated to be due to the magnetic exchange interaction and orbital hybridization between Co atoms. For Co single atoms adsorbed on Pd (111) surface, only one apparent height is found, suggesting that it is due to a different interaction from Co on Rh (111) surface. We do not find notable feature near the Fermi level in the dI/dV spectra of all Co monomers, dimers and trimers.
[1] Jiang Y H, Liu L W, Yang K, Xiao W D, Gao H J 2011 Chin. Phys. B 20 096401
[2] Zhao M H, Sun J J, Wang D, Zou Z Q, Liang Q 2010 Acta Phys. Sin. 59 636 (in Chinese) [赵明海, 孙静静, 王丹, 邹志强, 梁齐 2010 59 636]
[3] Zhang H G, Mao J H, Liu Q, Jiang N, Zhou H T, Guo H M, Shi D X, Gao H J 2010 Chin. Phys. B 19 018105
[4] Xu M J, Mayandi J, Wang X S, Jia J F, Xue Q K, Dou X M 2010 Chin. Phys. B 19 106102
[5] Dou W D, Zhang H J, Bao S N 2010 Chin. Phys. B 19 026803
[6] Madhavan V, Chen W, Jamneala T, Crommie M F, Wingreen N S 1998 Science 280 567
[7] Manoharan H C, Lutz C P, Eigler D M 2000 Nature 403 512
[8] Knorr N, Schneider M A, Diekhoner L, Wahl P, Kern K 2002 Phys. Rev. Lett. 88 096804
[9] Nagaoka K, Jamneala T, Grobis M, Crommie M F 2002 Phys. Rev. Lett. 88 077205
[10] Schneider M A, Vitali L, Knorr N, Kern K 2002 Phys. Rev. B 65 121406
[11] Wahl P, Diekhoner L, Schneider M A, Vitali L, Wittich G, Kern K 2004 Phys. Rev. Lett. 93 176603
[12] Otte A F, Ternes M, von Bergmann K, Loth S, Brune H, Lutz C P, Hirjibehedin C F, Heinrich A J 2008 Nature Physics 4 847
[13] Hirjibehedin C F, Lin C Y, Otte A F, Ternes M, Lutz C P, Jones B A, Heinrich A J 2007 Science 317 1199
[14] Balashov T, Schuh T, Takács A F, Ernst A, Ostanin S, Henk J, Mertig I, Bruno P, Miyamachi T, Suga S, Wulfhekel W 2009 Phys. Rev. Lett. 102 257203
[15] Chen W, Jamneala T, Madhavan V, Crommie M F 1999 Phys. Rev. B 60 R8529
[16] Jamneala T, Madhavan V, Crommie M F 2001 Phys. Rev. Lett. 87 256804
[17] Wahl P, Simon P, Diekhöner L, Stepanyuk V S, Bruno P, Schneider M A, Kern K 2007 Phys. Rev. Lett. 98 056601
[18] Neel N, Kroger J, Berndt R, Wehling T O, Lichtenstein A I, Katsnelson M I 2008 Phys. Rev. Lett. 101 266803
[19] Gambardella P, Rusponi S, Veronese M, Dhesi S S, Grazioli C, Dallmeyer A, Cabria I, Zeller R, Dederichs P H, Kern K, Carbone C, Brune H 2003 Science 300 1130
[20] Etz C, Zabloudil J, Weinberger P, Vedmedenko E Y 2008 Phys. Rev. B 77 184425
[21] Blonski P, Lehnert A, Dennler S, Rusponi S, Etzkorn M, Moulas G, Bencok P, Gambardella P, Brune H, Hafner J 2010 Phys. Rev. B 81 104426
[22] Feng W, Feng X Y, Zhao A D, Li B, Wang B, Hou J G, Yang J L unpublished results
[23] Liu K, Wang B 2011 Acta Phys. Sin. 60 046801 (in Chinese) [刘锴, 王兵 2011 60 046801]
[24] Qiu Y F, Du W H, Wang B 2011 Acta Phys. Sin. 60 036801 (in Chinese) [邱云飞, 杜文汉, 王兵 2011 60 036801]
[25] Fano U 1961 Phys. Rev. 124 1866
[26] Madhavan V, Chen W, Jamneala T, Crommie M F, Wingreen N S 2001 Phys. Rev. B 64 165412
[27] Bork J, Zhang Y-h, Diekhöner L, Borda L, Simon P, Kroha J, PeterWahl, Kern K 2011 Nat. Phys. 7 901
[28] Weissmann M, Saul A, Llois A M, Guevara J 1999 Phys. Rev. B 59 8405
[29] Lang N D 1987 Phys. Rev. Lett. 58 45
[30] Hewson A C 1993 The Kondo problem to heavy fermions (Cambridge: Cambridge University Press)
[31] Goldhaber-Gordon D, Göres J, Kastner M A, Shtrikman H, Mahalu D, Meirav U 1998 Phys. Rev. Lett. 81 5225
[32] Bulka B R, Stefan'ski P 2001 Phys. Rev. Lett. 86 5128
[33] Costi T A, Hewson A C, Zlatic V 1994 J. Phys.: Condens. Matter 6 2519
[34] Jamneala T, Madhavan V, Chen W, Crommie M F 2000 Phys. Rev. B 61 9990
[35] Alexander S, Anderson P W 1964 Phys. Rev. 133 1594
[36] Oswald A, Zeller R, Braspenning P J, Dederichs P H 1985 J. Phys. F 15 193
[37] Jayaprakash C, Krishna-murthy H R, Wilkins J W 1981 Phys. Rev. Lett. 47 737
[38] Savkin V V, Rubtsov A N, Katsnelson M I, Lichtenstein A I 2005 Phys. Rev. Lett. 94 026402
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[1] Jiang Y H, Liu L W, Yang K, Xiao W D, Gao H J 2011 Chin. Phys. B 20 096401
[2] Zhao M H, Sun J J, Wang D, Zou Z Q, Liang Q 2010 Acta Phys. Sin. 59 636 (in Chinese) [赵明海, 孙静静, 王丹, 邹志强, 梁齐 2010 59 636]
[3] Zhang H G, Mao J H, Liu Q, Jiang N, Zhou H T, Guo H M, Shi D X, Gao H J 2010 Chin. Phys. B 19 018105
[4] Xu M J, Mayandi J, Wang X S, Jia J F, Xue Q K, Dou X M 2010 Chin. Phys. B 19 106102
[5] Dou W D, Zhang H J, Bao S N 2010 Chin. Phys. B 19 026803
[6] Madhavan V, Chen W, Jamneala T, Crommie M F, Wingreen N S 1998 Science 280 567
[7] Manoharan H C, Lutz C P, Eigler D M 2000 Nature 403 512
[8] Knorr N, Schneider M A, Diekhoner L, Wahl P, Kern K 2002 Phys. Rev. Lett. 88 096804
[9] Nagaoka K, Jamneala T, Grobis M, Crommie M F 2002 Phys. Rev. Lett. 88 077205
[10] Schneider M A, Vitali L, Knorr N, Kern K 2002 Phys. Rev. B 65 121406
[11] Wahl P, Diekhoner L, Schneider M A, Vitali L, Wittich G, Kern K 2004 Phys. Rev. Lett. 93 176603
[12] Otte A F, Ternes M, von Bergmann K, Loth S, Brune H, Lutz C P, Hirjibehedin C F, Heinrich A J 2008 Nature Physics 4 847
[13] Hirjibehedin C F, Lin C Y, Otte A F, Ternes M, Lutz C P, Jones B A, Heinrich A J 2007 Science 317 1199
[14] Balashov T, Schuh T, Takács A F, Ernst A, Ostanin S, Henk J, Mertig I, Bruno P, Miyamachi T, Suga S, Wulfhekel W 2009 Phys. Rev. Lett. 102 257203
[15] Chen W, Jamneala T, Madhavan V, Crommie M F 1999 Phys. Rev. B 60 R8529
[16] Jamneala T, Madhavan V, Crommie M F 2001 Phys. Rev. Lett. 87 256804
[17] Wahl P, Simon P, Diekhöner L, Stepanyuk V S, Bruno P, Schneider M A, Kern K 2007 Phys. Rev. Lett. 98 056601
[18] Neel N, Kroger J, Berndt R, Wehling T O, Lichtenstein A I, Katsnelson M I 2008 Phys. Rev. Lett. 101 266803
[19] Gambardella P, Rusponi S, Veronese M, Dhesi S S, Grazioli C, Dallmeyer A, Cabria I, Zeller R, Dederichs P H, Kern K, Carbone C, Brune H 2003 Science 300 1130
[20] Etz C, Zabloudil J, Weinberger P, Vedmedenko E Y 2008 Phys. Rev. B 77 184425
[21] Blonski P, Lehnert A, Dennler S, Rusponi S, Etzkorn M, Moulas G, Bencok P, Gambardella P, Brune H, Hafner J 2010 Phys. Rev. B 81 104426
[22] Feng W, Feng X Y, Zhao A D, Li B, Wang B, Hou J G, Yang J L unpublished results
[23] Liu K, Wang B 2011 Acta Phys. Sin. 60 046801 (in Chinese) [刘锴, 王兵 2011 60 046801]
[24] Qiu Y F, Du W H, Wang B 2011 Acta Phys. Sin. 60 036801 (in Chinese) [邱云飞, 杜文汉, 王兵 2011 60 036801]
[25] Fano U 1961 Phys. Rev. 124 1866
[26] Madhavan V, Chen W, Jamneala T, Crommie M F, Wingreen N S 2001 Phys. Rev. B 64 165412
[27] Bork J, Zhang Y-h, Diekhöner L, Borda L, Simon P, Kroha J, PeterWahl, Kern K 2011 Nat. Phys. 7 901
[28] Weissmann M, Saul A, Llois A M, Guevara J 1999 Phys. Rev. B 59 8405
[29] Lang N D 1987 Phys. Rev. Lett. 58 45
[30] Hewson A C 1993 The Kondo problem to heavy fermions (Cambridge: Cambridge University Press)
[31] Goldhaber-Gordon D, Göres J, Kastner M A, Shtrikman H, Mahalu D, Meirav U 1998 Phys. Rev. Lett. 81 5225
[32] Bulka B R, Stefan'ski P 2001 Phys. Rev. Lett. 86 5128
[33] Costi T A, Hewson A C, Zlatic V 1994 J. Phys.: Condens. Matter 6 2519
[34] Jamneala T, Madhavan V, Chen W, Crommie M F 2000 Phys. Rev. B 61 9990
[35] Alexander S, Anderson P W 1964 Phys. Rev. 133 1594
[36] Oswald A, Zeller R, Braspenning P J, Dederichs P H 1985 J. Phys. F 15 193
[37] Jayaprakash C, Krishna-murthy H R, Wilkins J W 1981 Phys. Rev. Lett. 47 737
[38] Savkin V V, Rubtsov A N, Katsnelson M I, Lichtenstein A I 2005 Phys. Rev. Lett. 94 026402
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