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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]
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[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
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[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
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[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
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[23] Mitra J, Paranjape M, Raychaudhuri A K 2005 Phys. Rev. B 71 094426
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[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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