Quasi-one-dimensional BalrO3: On the verge of a weak ferromagnetic metallic state

2002 ◽  
Vol 12 (9) ◽  
pp. 91-92
Author(s):  
G. Cao ◽  
G. Shaw ◽  
J. W. Brill
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Ground State ◽  
Sharp Peak ◽  
Metallic State ◽  
Magnetization Measurements ◽  
One Dimensional ◽  
Impurity Doping ◽  
Weak Ferromagnetic

We report on calorimetric, resistivity, and magnetization measurements on single crystal BalrO3 and its derivatives. All results indicate a phase transition at $\rm T_c$=175 K, and two additional features are observed in resistivity: a sharp peak at 80 K and an upturn at 26 K. It is found that dilute impurity doping with Sr drastically suppresses $\rm T_c$ and leads to an instant nonmetal to metal transition below $\rm T_c$ underlining the instability of the ground state.

FISDW in quasi-one dimensional organic conductors with the dimerized gap due to anion ordering

2002 ◽  
Vol 12 (9) ◽  
pp. 381-384
Author(s):  
N. Matsunaga ◽  
A. Ayari ◽  
P. Moncea ◽  
K. Yamashita ◽  
A. Ishikawa ◽  
...  
Keyword(s):  
Phase Transition ◽  
Ground State ◽  
Quantum Hall ◽  
Organic Conductors ◽  
Hall Resistance ◽  
Cooling Rates ◽  
One Dimensional ◽  
Stable Quantum ◽  
New Phase ◽  
Quantum Hall State

Magnetoresistance and Hall resistance measurements have been carried out in the FISDW phase of deuterated (TMTSF)2C1O4 for various cooling rates through the anion ordering temperature. The Hall resistance in the intermediate cooled state, observed a very stable quantum Hall state above 9.0 T for slowly cooled, shows a step-like change from the phase between 10 and 17 T to the phase between 20 and 25 T with hysteresis between 14 and 21 T. This result suggests that there is a new phase transition around 15 T in deuterated (TMTSF)4ClO4. A possible ground state of the FISDW phase of (TMTSF)2C1O4 for various cooling rates is discussed from the viewpoint of the peculiar SDW nesting vector stabilized by the dimerized gap due to anion ordering.

QUANTUM PHASE TRANSITIONS AND ENTANGLEMENT IN J1–J2 MODEL

2004 ◽  
Vol 15 (08) ◽  
pp. 1095-1103 ◽  
Author(s):  
RECEP ERYIĞIT ◽  
RESUL ERYIĞIT ◽  
YIĞIT GÜNDÜÇ
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Phase Transitions ◽  
Ground State ◽  
Abrupt Change ◽  
Quantum Phase Transitions ◽  
Nearest Neighbors ◽  
Competing Interactions ◽  
One Dimensional ◽  
Transition Points

We study ground state pairwise entanglement within one-dimensional spin-1/2 antiferromagnetic J1–J2 model with competing interactions. Contrary to some claims we found that frustration does not increase entanglement. Concurrence of nearest and next nearest neighbors are found to show abrupt change at phase transition points. We also show that the concurrence can be used to classify the phase diagram of the model in anisotropy–frustration plane.

π–d INTERACTION BASED MOLECULAR CONDUCTING MAGNETS: HOW TO INCREASE THE EFFECTS OF THE π–d INTERACTION

COSMOS ◽  
2008 ◽  
Vol 04 (02) ◽  
pp. 131-140 ◽  
Author(s):  
AKIRA MIYAZAKI ◽  
TOSHIAKI ENOKI
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Transition Temperature ◽  
Phase Boundary ◽  
Ground State ◽  
Magnetic Order ◽  
Molecular Magnets ◽  
Metallic State ◽  
One Dimensional

The crystal structures and electronic and magnetic properties of conducting molecular magnets developed by our group are reviewed from the viewpoints of our two current strategies for increasing the efficiency of the π–d interaction. (EDTDM)2 FeBr 4 is composed of quasi-one-dimensional donor sheets sandwiched between magnetic anion sheets. The ground state of the donor layer changes from the insulator state to the metallic state by the application of pressure. When it is near to the insulator–metal phase boundary pressure, the magnetic order of the anion spins considerably affects the transport properties of the donor layer. The crystal structure of ( EDO – TTFBr 2)2 FeX 4 ( X = Cl , Br ) is characterized by strong intermolecular halogen–halogen contacts between the organic donor and FeX 4 anion molecules. The presence of the magnetic order of the Fe 3+ spins and relatively high magnetic order transition temperature proves the role of the halogen–halogen contacts as exchange interaction paths.

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra
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