Local Electronic Properties in the Presence of Internal and External Magnetic Fields Studied by Variable-Temperature Scanning Tunneling Spectroscopy

1998 ◽  
Vol 37 (Part 1, No. 6B) ◽  
pp. 3769-3773 ◽  
Author(s):  
Roland Wiesendanger ◽  
Matthias Bode ◽  
Ralph Dombrowski ◽  
Mathias Getzlaff ◽  
Markus Morgenstern ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Electronic Properties ◽  
Variable Temperature ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Temperature Scanning

scholarly journals Electronic properties of individual diarylethene molecules studied using scanning tunneling spectroscopy

2012 ◽  
Vol 111 (8) ◽  
pp. 083716 ◽  
Author(s):  
Arramel ◽  
T. C. Pijper ◽  
T. Kudernac ◽  
N. Katsonis ◽  
M. van der Maas ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling

SPATIAL EVOLUTION OF THE BACKGROUND CONDUCTANCE IN THE TUNNELING SPECTRA IN Bi2Sr2-xLaxCuO6+δ

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3190-3193
Author(s):  
T. KATO ◽  
T. MACHIDA ◽  
Y. KAMIJO ◽  
K. HARADA ◽  
R. SAITO ◽  
...  
Keyword(s):  
Low Temperature ◽  
Single Crystal ◽  
Spatial Variation ◽  
Energy Gap ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Spatial Evolution ◽  
Local Energy ◽  
Temperature Scanning

The spatial evolution of the background conductance in the tunneling spectra was investigated with low-temperature scanning tunneling spectroscopy on a slightly overdoped Bi 2 Sr 1.74 La 0.26 CuO 6+δ single crystal at 4.2 K. The asymmetry in the background conductance between positive and negative biases strongly correlates with the local energy gap, which shows the inhomogeneous spatial variation: the tunneling spectra become more asymmetric in the regions where the spectra exhibit larger gap value.

Mapping of local electronic properties in nanostructured CMR thin films by Scanning Tunneling Microscopy (STM) and Local Conductance Map (LCMAP)

2004 ◽  
Vol 838 ◽  
Author(s):  
Sohini Kar ◽  
Barnali Ghosh ◽  
L. K. Brar ◽  
M A. Paranjape ◽  
A. K. Raychaudhuri
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Grain Boundaries ◽  
Electronic Properties ◽  
Variable Temperature ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Colossal Magnetoresistive ◽  
Spatially Resolved ◽  
Temperature Scanning

ABSTRACTWe have investigated the local electronic properties and the spatially resolved magnetoresistance of a nanostructured film of a colossal magnetoresistive (CMR) material by local conductance mapping (LCMAP) using a variable temperature Scanning Tunneling Microscope (STM) operating in a magnetic field. The nanostructured thin films (thickness ≈500nm) of the CMR material La0.67Sr0.33MnO3(LSMO) on quartz substrates were prepared using chemical solution deposition (CSD) process. The CSD grown films were imaged by both STM and atomic force microscopy (AFM). Due to the presence of a large number of grain boundaries (GB's), these films show low field magnetoresistance (LFMR) which increases at lower temperatures.The measurement of spatially resolved electronic properties reveal the extent of variation of the density of states (DOS) at and close to the Fermi level (EF) across the grain boundaries and its role in the electrical resistance of the GB. Measurement of the local conductance maps (LCMAP) as a function of magnetic field as well as temperature reveals that the LFMR occurs at the GB. While it was known that LFMR in CMR films originates from the GB, this is the first investigation that maps the local electronic properties at a GB in a magnetic field and traces the origin of LFMR at the GB.

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