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Phys. Rev. B 70, 161103(R) (2004) [4 pages]

Evolution of local electronic states from a metal to a correlated insulator in a NiS2−xSex solid solution

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K. Iwaya1,3, Y. Kohsaka2, S. Satow2, T. Hanaguri1,3, S. Miyasaka4, and H. Takagi1,2,3
1RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
2Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8651, Japan
3CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
4Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan

Received 7 June 2004; published 20 October 2004

The evolution of local electronic states in NiS2−xSex pyrite as a bandwidth-controlled metal-insulator transition (MIT) approached from the metallic side is explored by scanning tunneling microscopy/spectroscopy (STM/STS). Atomically resolved images of Se∕S zigzag chains are observed on top of the cubic (100) surface, and a narrowing of the quasiparticle band near the Fermi level is clearly identified in tunneling spectra. In marked contrast to MIT’s control by doping, the local electronic states are found to be spatially homogeneous even in the vicinity of the MIT.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.161103
DOI:
10.1103/PhysRevB.70.161103
PACS:
71.30.+h
 
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