Symmetry and twins in the monophosphate tungsten bronze series (PO2)4(WO3)2m (2 ≤ m ≤ 14)

2000 ◽  
Vol 56 (3) ◽  
pp. 377-391 ◽  
Author(s):  
Pascal Roussel ◽  
Philippe Labbé ◽  
Daniel Groult
Keyword(s):  
Charge Density Wave ◽  
Room Temperature ◽  
Density Wave ◽  
Tungsten Bronze ◽  
Metallic State ◽  
Temperature Form ◽  
Low Dimensional ◽  
Low Dimensional Materials ◽  
High Temperature Form ◽  
M 14

Monophosphate tungsten bronze with pentagonal tunnels (PO2)4(WO3)2 m are low-dimensional materials with charge density wave (CDW)-type electron instabilities. Two forms of the structure can thus be expected for all the members of the series: a low-temperature form (LT) corresponding to the CDW state and a high-temperature form (HT) corresponding to a normal metallic state. The HT form is described here for m = 9 and compared with that of the m = 5 and m = 7 counterparts. It is shown that a systematic twin phenomenon must be taken into account for HT members because of two possible configurations of the tilting mode of WO6 octahedra. The structure is also compared with that of m = 10, which exhibits the modulated CDW–LT form at room temperature. Owing to two possible polarization directions of the segments built of m WO6 octahedra, a twin phenomenon is also encountered in the LT forms. A review of all the structures known at present (m = 2, 4, 5, 6, 7, 8, 9, 10, 12) leads us to propose a structural law based on the building mode of WO6 octahedra in WO3-type slabs to explain the symmetry changes observed between even and odd members of the series.

scholarly journals Cascading transitions toward unconventional charge density wave states in the quasi-two-dimensional monophosphate tungsten bronze P4W16O56

IUCrJ ◽  
2020 ◽  
Vol 7 (2) ◽  
pp. 184-192
Author(s):  
Elen Duverger-Nédellec ◽  
Alain Pautrat ◽  
Kamil K. Kolincio ◽  
Laurence Hervé ◽  
Olivier Pérez
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Chemical Vapour ◽  
Tungsten Bronze ◽  
X Ray Diffraction ◽  
Strong Electron ◽  
Electron Phonon Coupling ◽  
Wave States ◽  
Low Dimensional

Single crystals of the m = 8 member of the low-dimensional monophosphate tungsten bronzes (PO2)4(WO3)2m family were grown by chemical vapour transport technique and the high crystalline quality obtained allowed a reinvestigation of the physical and structural properties. Resistivity measurements revealed three anomalies at T C1 = 258 K, T C2 = 245 K and T C3 = 140 K, never observed until now. Parallel X-ray diffraction investigations showed a specific signature associated with three structural transitions, i.e. the appearance of different sets of satellite reflections below T C1, T C2 and T C3. Several harmonics of intense satellite reflections were observed, reflecting the non-sinusoidal nature of the structural modulations and a strong electron–phonon coupling in the material. These transitions could be associated with the formation of three successive unconventional charge density wave states.

Charge density wave, superconductivity, and non-metallic behaviour under high pressure in ZrTe3

2002 ◽  
Vol 12 (9) ◽  
pp. 97-98
Author(s):  
K. Igarashi ◽  
S. Yasuzuka ◽  
K. Inagaki ◽  
S. Tanda ◽  
Y. Okajima ◽  
...  
Keyword(s):  
High Pressure ◽  
Fermi Surface ◽  
Charge Density ◽  
Charge Density Wave ◽  
High Pressures ◽  
Density Wave ◽  
Metallic State ◽  
Resistivity Measurements ◽  
Low Dimensional ◽  
The Relationship

The charge-density-wave (CDW) order of low-dimensional inorganic conductor ZrTe3 is found to increase with increasing pressure, while the superconductivity with filamentary nature is significantly suppressed. It was evidenced in resistivity measurements under pressure up to 0.8 Cpa. The present results suggest that competition between the superconductivity and the CDW is not simply explained by a nesting effect of the Fermi surface, but other origin is needed. Non-metallic behaviour is also found below 4 K under high pressures above 0.6 Gpa. The relationship between the non-metallic state and the pressure-enhanced CDW is expected, although yet inexplicable.

scholarly journals Incommensurate two-dimensional checkerboard charge density wave in the low-dimensional superconductor Ta4Pd3Te16

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Zhenzhong Shi ◽  
S. J. Kuhn ◽  
F. Flicker ◽  
T. Helm ◽  
J. Lee ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Two Dimensional ◽  
Low Dimensional

Anomalous Metallic State Coexisting with the Charge Density Wave in Rb3Cu8S6Studied by NMR and Spin Echo Double Resonance (SEDOR)

1998 ◽  
Vol 67 (5) ◽  
pp. 1560-1563
Author(s):  
Atsushi Goto ◽  
Tadashi Shimizu ◽  
Haruyoshi Aoki ◽  
Masahiko Isobe ◽  
Yutaka Ueda
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Spin Echo ◽  
Double Resonance ◽  
Density Wave ◽  
Metallic State

scholarly journals Ultrafast manipulation of mirror domain walls in a charge density wave

2018 ◽  
Vol 4 (10) ◽  
pp. eaau5501 ◽  
Author(s):  
Alfred Zong ◽  
Xiaozhe Shen ◽  
Anshul Kogar ◽  
Linda Ye ◽  
Carolyn Marks ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Room Temperature ◽  
Domain Walls ◽  
Density Wave ◽  
Charge Ordering ◽  
Time Resolved ◽  
Insulator Metal Transition ◽  
Femtosecond Light Pulse ◽  
A Charge

Domain walls (DWs) are singularities in an ordered medium that often host exotic phenomena such as charge ordering, insulator-metal transition, or superconductivity. The ability to locally write and erase DWs is highly desirable, as it allows one to design material functionality by patterning DWs in specific configurations. We demonstrate such capability at room temperature in a charge density wave (CDW), a macroscopic condensate of electrons and phonons, in ultrathin 1T-TaS2. A single femtosecond light pulse is shown to locally inject or remove mirror DWs in the CDW condensate, with probabilities tunable by pulse energy and temperature. Using time-resolved electron diffraction, we are able to simultaneously track anti-synchronized CDW amplitude oscillations from both the lattice and the condensate, where photoinjected DWs lead to a red-shifted frequency. Our demonstration of reversible DW manipulation may pave new ways for engineering correlated material systems with light.

High field De Haas-van Alphen studies in the charge density wave state of the quasi two-dimensional monophosphate tungsten bronze P4W12O44

1997 ◽  
Vol 86 (1-3) ◽  
pp. 2133-2134 ◽  
Author(s):  
C. Le Touze ◽  
L.H. Nguyen ◽  
C. Schlenker ◽  
E. Steep ◽  
M. Greenblatt
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
High Field ◽  
Density Wave ◽  
Tungsten Bronze ◽  
Two Dimensional ◽  
Wave State

Achieving Room‐Temperature Charge Density Wave in Transition Metal Dichalcogenide 1 T ‐VSe 2

2020 ◽  
Vol 6 (5) ◽  
pp. 1901427
Author(s):  
Jiajia Feng ◽  
Resta A. Susilo ◽  
Bencheng Lin ◽  
Wen Deng ◽  
Yanju Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Charge Density ◽  
Charge Density Wave ◽  
Room Temperature ◽  
Density Wave ◽  
Transition Metal Dichalcogenide
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