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Phys. Rev. B 80, 155458 (2009) [6 pages]

Two-dimensional metal-organic coordination networks of Mn-7,7,8,8-tetracyanoquinodimethane assembled on Cu(100): Structural, electronic, and magnetic properties

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Tzu-Chun Tseng1, Chensheng Lin2,*, Xingqiang Shi2, Steven L. Tait1,3,†,‡, Xiong Liu1, Ulrich Starke1, Nian Lin1,4, Ruiqin Zhang2, Christian Minot2,5, M. A. Van Hove2,‡,§, Jorge I. Cerdá6, and Klaus Kern1,7
1Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
2Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China
3Department of Chemistry, Indiana University, Bloomington, Indiana 47405, USA
4Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
5Laboratoire de Chimie Théorique, Université Pierre et Marie Curie Paris 6, CNRS UMR 7616, Case 137, 4 Place Jussieu, Paris F-75252 Cedex, France
6Instituto de Ciencia de Materiales de Madrid, ICMM–CSIC, Cantoblanco, 28049 Madrid, Spain
7École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

Received 3 August 2009; revised 5 October 2009; published 30 October 2009

A compound two-dimensional (2D) monolayer mixing Mn atoms and 7,7,8,8-tetracyanoquinodimethane (TCNQ) molecules was synthesized by supramolecular assembly on a Cu(100) surface under ultrahigh vacuum conditions. Its structural, electronic, and magnetic properties were analyzed by scanning tunneling microscopy experiment and theory, low-energy electron diffraction, x-ray photoemission spectroscopy, and density-functional theory calculations. The 2D compound has a long-range ordered square planar network structure consisting of fourfold coordinated Mn centers with a Mn:TCNQ ratio of 1:2. The electronic-state analysis revealed a complex charge-transfer scenario indicating strong bonding of TCNQ with both the Mn adsorbates and the Cu surface atoms. The calculations reveal that the Mn centers carry a magnetic moment close to 5μB with very weak coupling between adjacent Mn centers.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.155458
DOI:
10.1103/PhysRevB.80.155458
PACS:
68.43.Hn, 81.16.Fg, 68.37.Ef, 68.43.Bc

*Present address: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, China.

tait@indiana.edu

Author to whom correspondence should be addressed.

§vanhove@cityu.edu.hk