ELECTRONIC PROPERTIES OF GRAPHENE, FEW-LAYER GRAPHENE, AND BULK GRAPHITE UNDER VERY HIGH MAGNETIC FIELD

2011 ◽  
Vol 10 (01n02) ◽  
pp. 43-47
Author(s):  
AMIT KUMAR ◽  
J. M. POUMIROL ◽  
W. ESCOFFIER ◽  
M. GOIRAN ◽  
B. RAQUET ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Magnetic Field ◽  
Pyrolytic Graphite ◽  
Density Wave ◽  
Hall Resistance ◽  
Layer Graphene ◽  
Bulk Graphite ◽  
Graphene Sample ◽  
Few Layer Graphene ◽  
Very High

In the present work, we report on the magneto-transport properties of graphitic based materials (graphene, few-layer graphene, and bulk graphite) in very high magnetic field. Quantum Hall Effect (QHE) has been studied in graphitic systems in very high pulsed magnetic field (up to B = 57 T ) and at low temperature (≤ 4 K). Graphene sample shows well-defined Hall resistance plateaus at filling factors v = 2,6,10, etc. Few-layer graphene systems display clear signatures of standard and unconventional QHE. Magneto-transport studies on bulk highly oriented pyrolytic graphite show a charge density wave transition at strong enough magnetic field as well as Hall coefficient sign reversal.

High magnetic field NMR investigation of the spin density wave phase of TMTSF2PF6

2002 ◽  
Vol 12 (9) ◽  
pp. 389-389
Author(s):  
W. G. Clark ◽  
F. Zamborsky ◽  
B. Alavi ◽  
P. Vonlanthen ◽  
W. Moulton ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Proton Relaxation ◽  
High Magnetic Fields ◽  
Organic Conductor ◽  
First Order ◽  
The Magnetic Field ◽  
Very High

We report proton NMR measurements of the effect of very high magnetic fields up to 44.7 T (1.9 GHz) on the spin density wave (SDW) transition of the organic conductor TMTSF2PF6. Up to 1.8 GHz, no effect of critical slowing close to the transition is seen on the proton relaxation rate (1/T1), which is determined by the SDW fluctuations associated with the phase transition at the NMR frequency. Thus, the correlation time for such fluctuations is less than $1O^{-10}$s. A possible explanation for the absence of longer correlation times is that the transition is weakly first order, so that the full critical divergence is never achieved. The measurements also show a dependence of the transition temperature on the orientation of the magnetic field and a quadratic dependence on its magnitude that agrees with earlier transport measurements at lower fields. The UCLA part of this work was supported by NSF Grant DMR-0072524.

High magnetic field quantum transport in the low temperature density wave state of the purple bronze KMo6O17

1993 ◽  
Vol 56 (2-3) ◽  
pp. 2725-2730 ◽  
Author(s):  
A. Rotger ◽  
C. Schlenker ◽  
J. Dumas ◽  
J. Marcus ◽  
S. Dubois ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
High Magnetic Field ◽  
Quantum Transport ◽  
Density Wave ◽  
Wave State

MAGNETIC STUDIES OF SUPERCONDUCTING GdBa2Cu3O6+δ AT LOW TEMPERATURE AND HIGH FIELD

1987 ◽  
Vol 01 (05n06) ◽  
pp. 245-250 ◽  
Author(s):  
C.Y. HUANG ◽  
Y. SHAPIRA ◽  
P.H. HOR ◽  
R.L. MENG ◽  
C.W. CHU
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
High Magnetic Field ◽  
High Field ◽  
Paramagnetic Phase ◽  
Néel Temperature ◽  
Magnetic Studies ◽  
Spin Subsystem ◽  
Very High ◽  
Canted Phase

The magnetization of antiferromagnetic superconducting GdBa2Cu3O6+δ has been measured for ~1.5<T≤4.2 K for field up to ~20 T. We found that all Gd3+ spins are nearly parallel at very high field, and that this saturated spin subsystem coexists with superconductivity. Below the Néel temperature, 2.22 K, we observed the transition from the “canted” phase to the paramagnetic phase by the application of a high magnetic field.

Production of few-layer graphene through liquid-phase pulsed laser exfoliation of highly ordered pyrolytic graphite

2012 ◽  
Vol 258 (22) ◽  
pp. 9092-9095 ◽  
Author(s):  
Min Qian ◽  
Yun Shen Zhou ◽  
Yang Gao ◽  
Tao Feng ◽  
Zhuo Sun ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Pyrolytic Graphite ◽  
Pulsed Laser ◽  
Layer Graphene ◽  
Highly Ordered Pyrolytic Graphite ◽  
Few Layer Graphene
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