Image of the Month

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Image of the Month
Posted Date: July 1, 2012
institution

Microscope:
RHK Technology, ATM 300

Controls:
RHK SPM 1000

Contributors:
C. Meier, M. Roos, D. Künzel, A. Breitruck, H. Hoster , A. Gross, R. J. Behm, U. Ziener – University of Ulm, Germany

K. Landfester –  Max-Planck Institute for Polymer Research, Mainz, Germany

Reference:
J. Phys. Chem. C 2010, 114, 1268-1277

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PRIcon
Image of the Month
Posted Date: June 1, 2012
institution

Abstract:
See Abstract

Microscope:
RHK Technology, UHV 300

Controls:
UHV SPM 100

Contributors:
Miki Nakayama, Natalie A. Kautz, Tuo Wang, and S. J. Sibener

Reference:
dx.doi.org/10.1021/la204986n | Langmuir

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Image of the Month
Posted Date: March 1, 2011
iotm-march-2011

(a)–(c) Intensity plots of G(V)/GN as a function of temperature and applied bias for three different films (upper panels), and the resistance vs temperature (R-T) in the same temperature range (lower panels); vertical dotted lines in the upper panels correspond to Tc. Insets of panels (a),(b) and left inset of panel (c) show representative tunneling spectra in the superconducting state (blue), in the pseudogap state (green) and above the pseudogap temperature (red). The right inset of panel (c) shows the AA background subtracted spectra at 2.65 K. [right inset of Fig. 2(c)] clearly reveals the presence of broadened coherence peaks around 2 mV confirming the superconducting origin of the pseudogap feature. In addition, the individual line scans [23], reveal that the superconducting state becomes progressively inhomogeneous as the disorder is increased [11].

Microscope:
Homebuilt STM

Controls:
RHK SPM 100

Contributors:
M. Mondal, A. Kamlapure, M. Chand, G. Saraswat, S. Kumar, J. Jesudasan, L. Benfatto, V. Tripathi, and P. Raychaudhuri – Tata Institute of Fundamental Research and Sapienza University

Reference:
Phys. Rev. Lett. 106, 047001 (2011)

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Image of the Month
Posted Date: February 1, 2011
institution

Porphyrin derivatives are promising candidates for the generation of functional molecular architectures on surfaces. The unambiguous identification of individual porphyrin species is a prerequisite in this regard. We investigated a layer of intermixed tetraphenylporphyrins (TPP), namely 2HTPP, FeTPP and CoTPP at room temperature. Voltage-dependent STM imaging was successfully applied to discriminate the very similar porphyrins. The characteristic appearance of CoTPP at low negative voltages (>-0.4 V) can be traced back to a specific interaction of the Co dz2 orbital with the underlying Ag substrate. The dumbbell appearance observed for FeTPP over a wide bias range and for CoTPP at lower negative voltages (<-0.4 V) is in line with the well known saddle shape of the porphyrin macrocycle in the adsorbed state.

Microscope:
UHV300 VT

Controls:
RHK SPM 100

Contributors:
F. Buchner, K.-G. Warnick, T. Wölfle, A. Görling, H.-P. Steinrück, W. Hieringer and H. Marbach – Universitat Erlangen-Nurnberg

Reference:
J. Phys. Chem. C 2009, 113, 16450–16457

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