Transcript
Laboratorio de Bajas Temperaturas
Universidad Autónoma de Madrid
http://lbtuam.es
Very high magnetic field Scanning
Tunneling Microscopy
One of the 29 “Landmarks”
Members:
• CNRS (France)
• HZDR (Germany)
• RU/FOM (Holland)
• EPSRC (UK)
New research line
Very high magnetic field Scanning Tunneling Microscopy
New research line
Very high magnetic field Scanning Tunneling Microscopy
Current falicities at LBTUAM
• Dil fridge STM (15 mK)+ 5T-1T-1T (2102)
• Dil fridge STM (30 mK)+ 9T (2102)
• Dil fridge STM (7 mK)+ 9T(9102)
• 4K-cryostat + 17 T (3)
Under construction
• Dil fridge STM (7mK) + 17T (1.6103)
Near future facilities
• Dil fridge STM (7 mK) + 22T (2.2103)
• Hibrid magnet STM (>30 T) (102)Y.J. Song, et al., Review of Scientific Instruments 81, 121101 (2010).
New research line
Very high magnetic field Scanning Tunneling Microscopy
Current falicities at LBTUAM
• Dil fridge STM (15 mK)+ 5T-1T-1T (2102)
• Dil fridge STM (30 mK)+ 9T (2102)
• Dil fridge STM (7 mK)+ 9T(9102)
• 4K-cryostat + 17 T (3)
Under construction
• Dil fridge STM (7mK) + 17T (1.6103)
Near future facilities
• Dil fridge STM (7 mK) + 22T (2.2103)
• Hibrid magnet STM (>30 T) (102)Y.J. Song, et al., Review of Scientific Instruments 81, 121101 (2010).
Dilution refrigerator STM (7 mK + 17 T)
KelvinoxMX + versatil insert EX400 Low consumption 100 L dewar + 17T SC magnet
New high magnetic field STM
Compact very low temperature STM with mechanically
driven horizontal linear positioning state
H. Suderow, I. Guillamón and S. Vieira
Rev Sci Inst, 033771, 82 (2011)
100 mK
<15 meV
1. Spectroscopy
-1,0 -0,5 0,0 0,5 1,00,0
0,5
1,0
1,5
2,0
Experiment
Fit:
= 0.2 meV
T = 0.1 K
Norm
aliz
ed C
on
du
ctan
ce
Voltage (mV)
Al-Au
Spectroscopy in low Tc Superconductors
Rev Sci Inst, 033771, 82 (2011)
2. Mechanical pulling mechanism to move the tip over the sample
Macroscopic movement
2 mm
Nanoscopic movement
FIB milled paths in AuChange the scanning window in a controlled way at nanoscale and
low temperatures
We can put several sampleswhich are accesible in a
controlled way
Rev Sci Inst, 033771, 82 (2011)
2. Mechanical pulling mechanism to move the tip over the sample
Macroscopic movement
2 mm
Nanoscopic movement
FIB milled paths in AuChange the scanning window in a controlled way at nanoscale and
low temperatures
We can put several sampleswhich are accesible in a
controlled way
Rev Sci Inst, 033771, 82 (2011)
3. Sample preparation method at low temperatures (in-situ)
Visualizing electronic correlations under high magnetic fields
Landau level spectroscopy
exp (-k/ l B)
• Band structure at varying energy: empty
and occupied states
• Local measurements: at cleanest areas
• Spatial dependence: Inside vortex cores
𝐸𝑛 = 𝑛 +1
2ℏ𝜔𝑐 𝑛 = 0,1,2, … .
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