Cascade of First Order Phase Transitions in Field-Induced Spin Density Wave States

1992 ◽  
Vol 61 (4) ◽  
pp. 1246-1256 ◽  
Author(s):  
Yoshiki Hori ◽  
Kazushige Machida
Keyword(s):  
Phase Transitions ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
First Order ◽  
Wave States ◽  
First Order Phase

scholarly journals Charge density waves and their transitions in anisotropic quantum Hall systems

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yuchi He ◽  
Kang Yang ◽  
Mark Oliver Goerbig ◽  
Roger S. K. Mong
Keyword(s):  
Phase Transitions ◽  
Charge Density ◽  
Density Wave ◽  
Quantum Hall ◽  
Charge Density Waves ◽  
Stripe Phase ◽  
Electron Bubble ◽  
First Order ◽  
Bubble Phase ◽  
First Order Phase

AbstractIn recent experiments, external anisotropy has been a useful tool to tune different phases and study their competitions. In this paper, we look at the quantum Hall charge density wave states in the N = 2 Landau level. Without anisotropy, there are two first-order phase transitions between the Wigner crystal, the 2-electron bubble phase, and the stripe phase. By adding mass anisotropy, our analytical and numerical studies show that the 2-electron bubble phase disappears and the stripe phase significantly enlarges its domain in the phase diagram. Meanwhile, a regime of stripe crystals that may be observed experimentally is unveiled after the bubble phase gets out. Upon increase of the anisotropy, the energy of the phases at the transitions becomes progressively smooth as a function of the filling. We conclude that all first-order phase transitions are replaced by continuous phase transitions, providing a possible realisation of continuous quantum crystalline phase transitions.

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.

scholarly journals Effect of pressure on the superconducting and spin-density-wave states ofSmFeAsO1−xFx

2008 ◽  
Vol 78 (1) ◽  
Author(s):  
B. Lorenz ◽  
K. Sasmal ◽  
R. P. Chaudhury ◽  
X. H. Chen ◽  
R. H. Liu ◽  
...  
Keyword(s):  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Effect Of Pressure ◽  
Wave States

High-field magnetoresistance of the Bechgaard salt (TMTSF)2NO3: Quantum oscillations in the spin-density-wave state and phase transitions

1994 ◽  
Vol 50 (17) ◽  
pp. 12726-12732 ◽  
Author(s):  
Alain Audouard ◽  
Frédéric Goze ◽  
Jean-Pierre Ulmet ◽  
Luc Brossard ◽  
Salomon Askenazy ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Spin Density ◽  
High Field ◽  
Density Wave ◽  
Spin Density Wave ◽  
Wave State ◽  
Quantum Oscillations ◽  
Bechgaard Salt

IMPURITY EFFECTS ON THE MAGNETIC ORDERING IN CHROMIUM

1993 ◽  
Vol 07 (01n03) ◽  
pp. 620-623 ◽  
Author(s):  
R.S. FISHMAN ◽  
S.H. LIU
Keyword(s):  
Charge Density ◽  
Spin Density ◽  
Charge Density Wave ◽  
Second Harmonic ◽  
Density Wave ◽  
Spin Density Wave ◽  
Order Transition ◽  
Vanadium Concentration ◽  
First Order ◽  
First Order Transition

It is well-known that impurities profoundly alter the magnetic properties of chromium. While vanadium impurities suppress the Néel temperature TN, manganese impurities enhance TN substantially. As evidenced by neutron scattering experiments, doping with as little as 0.2% vanadium changes the transition from weakly first order to second order. Young and Sokoloff explained that the first-order transition in pure chromium is caused by a charge-density wave which is the second harmonic of the spin-density wave. By examining the subtle balance between the spin-density and charge-density wave terms in the mean-field free energy, we find that the first-order transition is destroyed when the vanadium concentration exceeds about 0.15%, in agreement with experiments.

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