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La0.67Ca0.33MnO3(001) thin films have been grown with pulsed laser deposition method, and the surface structures and electronic states have been characterized using scanning tunneling microscopy/spectroscopy (STM/STS). In the Mn-O terminated surface, insulating ( 2 × 2 )R45° reconstruction surface and metallic (1×1) reconstruction surface are observed. In the (La,Ca)-O terminated surface, the surface presents the stripe structure. The results obtained from the variable temperature STM/STS show that the ( 2 × 2 )R45° reconstructed surface persists in insulating phase in a temperature range of 144—300 K, which may shield the signal of possible insulator-metal transition occurred in bulk in STS measurements.
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Keywords:
- LCMO thin film /
- terminated surface /
- insulator-metal transition
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-
[1] Jin S, Tiefel T H, McCormack M, Fastnacht R A, Ramesh R, Chen L H 1994 Science 264 413
[2] Liu W, Cjem J P, Guan W, Xiong G C, Yan S S 2004 Acta Phys. Sin. 53 0601 (in Chinese) [刘 伟、陈晋平、管 炜、熊光成、阎守胜 2004 物理学报 53 0601]
[3] Duan P, Chen Z H, Dai S Y, Zhou Y L, Lu H B 2006 Acta Phys. Sin. 55 1441 (in Chinese) [段 苹、陈正豪、戴守遇、周岳亮、吕惠宾 2006 物理学报 55 1441]
[4] Zhang Y T, He M, Cheng Z Y, Lu H B 2009 Acta Phys. Sin. 58 2002 (in Chinese) [张营堂、何 萌、陈子瑜、吕惠宾 2009 物理学报 58 2002]
[5] Renner C, Aeppli G, Kim B G, Soh Y A, Cheong S W 2002 Nature 416 518
[6] Loudon J C, Mathur N D, Midgley P A 2002 Nature 420 1926
[7] Tao J, Niebieskikwiat D, Varela M, Luo W 2009 Phys. Rev. Lett. 103 097202
[8] Fath M, Freisam S, Menovski A A, Tomioka Y, Aarts J, Mydosh J A 1999 Science 285 1540
[9] Mori S, Chen C H, Cheong S W 1998 Nature 392 473
[10] Mori S, Chen C H, Cheong S W 1998 Phys. Rev. Lett. 81 3972
[11] CoX S, Singleton J, Mcdonald R D, Migliori A, Littlewood P B 2008 Nature Materials 7 25
[12] Nucara A, Maselli P, Calvani P, Sopracase R, Ortolani M 2008 Phys. Rev. Lett. 101 066407
[13] Koster S A 2008 Phys. Rev. B 78 052404
[14] Lu Q Y 1997 Science 276 2006
[15] Murakami Y, Kasai H, Kim J J, Mamishin S, Shindo D, Mori S, Tonomura A 2010 Nature Nanotechnology 5 37
[16] Zhang L W, Israel C, Biswas A, Greene R L, Lozanne A D 2002 Science 298 805
[17] Becker T, Streng C, Luo Y, Moshnyaga V, Damaschke B, Shannon N, Samwer K 2002 Phys. Rev. Lett. 89 237203
[18] Kiryukhin V, Casa D, Hill J P 1997 Nature 386 813
[19] Fiebig M, Miyano K, Tomioka Y 1998 Science 280 1925
[20] Ma J X, Gillapie D T, Plummer E W, Shen J 2005 Phys. Rev. Lett. 95 237210
[21] Fuchiganmi K, Gai Z, Ward T Z, Yin L F, Snijders P C, Plummer E W, Shen J 2009 Phys. Rev. Lett. 102 066104
[22] Rnnow H M, Renner C, Aeppli G, Kimura T, Tokura Y 2006 Nature 440 1025
[23] Mitra J, Paranjape M, Raychaudhuri A K 2005 Phys. Rev. B 71 094426
[24] Seiro S, Fasano Y, MaggiO A I, Koller E, Kuffer O 2008 Phys. Rev. B 77 020407
[25] Singh U R, Chaudhuri S, Choudhary S K, Budhani R C, Gupta A K 2008 Phys. Rev. B 77 014404
[26] Koster S A, Moshnyaga V, Damaschke B, Samwer K 2008 Phys. Rev. B 78 052404
[27] Kawasaki M 1994 Science 266 1540
[28] Weil J Y T, Yehl N C, Vasquez R P 1997 Phys. Rev. Lett. 79 5150
[29] Dagotto E, Hotta T, Moreo A 2004 Physics Reports 344 1
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