Charge-density Waves and Collective Dynamics in the Transition-metal Dichalcogenides PDF Download
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Author: Andreas König
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Author: Andreas König
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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Author: T. Butz
Publisher: Springer Science & Business Media
ISBN: 940151299X
Category : Science
Languages : en
Pages : 333
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Book Description
Nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), time differential perturbed angular correlations (TDPAC), and the Mössbauer effect (ME) have been applied to the study of charge density wave (CDW) systems. These hyperfine techniques provide unique tools to probe the structure and symmetry of commensurate CDWs, give a clear fingerprint of incommensurate CDWs, and are ideally suited for CDW dynamics. This book represents a new attempt in the series `Physics and Chemistry of Materials with Low-dimensional Structures' to bring together a consistent group of scientific results obtained by nuclear spectroscopy related to CDW phenomena in pseudo-one- and two-dimensional systems. The individual chapters contain: the theory of CDWs in chain-like transition metal tetrachalcogenides; NMR, NQR, TDPAC, and ME investigations of layered transition metal dichalcogenides; NMR studies of CDW-transport in chain-like NbSe3 and molybdenum bronzes; multinuclear NMR of KCP; high resolution NMR of organic conductors. This book is of interest to graduate students and all scientists who want to acquire a broader knowledge of nuclear spectroscopy techniques applied to CDW systems.
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Author: Gary K. Scott
Publisher: National Library of Canada
ISBN: 9780315144248
Category : Electrons
Languages : en
Pages : 188
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Author: Anton A. Anikin
Publisher:
ISBN:
Category : Charge density waves
Languages : en
Pages : 0
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Book Description
At low temperatures, the electronic structure of metals becomes unstable, and instabilities often develop correlated electronic states, decreasing the number of free carriers. One of these correlated states is a charge density wave state. It usually arises under the interaction of free carriers with phonons, and it is manifested as a superstructure over the original crystal lattice. The charge density wave state presents distinguishable experimental fingerprints in many physical properties of the crystal, spontaneously breaking its translational symmetry. The physics of the charge density wave is well established in the case of a one-dimensional metal; however, there are lot of open issues, when describing the systems of higher dimensions. The charge density wave state could potentially be utilized in low-energy electronic devices. Transition metal dichalcogenides are quasi two-dimensional materials, that exhibit a correlated electronic behavior, such as the superconductivity and the charge density wave. Due to their simple crystalline structures, nearly perfect crystals can be grown, and the electronic correlations can be studied in the absence of any disorder. An example of this class of materials is 2H-NbSe2, that undergoes both the charge density wave (T_CDW=33.5 K) and superconducting (T_SC=7.2 K) transitions. The first part of this work is focused on the single crystal growth, electronic transport characterization, and results of ultrafast transient reflectivity measurements of 2H-NbSe2 single crystals. Coherent lattice dynamics and characteristic relaxation times of photoexcited charge carriers have been extracted from the broadband transient optical spectroscopy. A wide temporal profile gives opportunity to track multiple ultrafast phenomena within the same experiment from 50 fs to few nanoseconds. The physical mechanisms leading to the charge density wave condensation are being discussed here. The second part of this work is focused on a studying of the temperature hysteresis in electrical transport properties in freshly grown undoped and doped 1T-TiSe2 single crystals. This transition metal dichalcogenide undergoes a chiral charge density wave at low temperatures (T_CDW=202 K). An irreversible behavior of electrical properties upon the thermocycling indicates an existence of metastable states in the charge density wave phase, and it is commonly attributed to additional phase transitions. The absence of strong experimental evidence of these transitions is collaborated with an opened dispute on the nature of charge density wave state in this material. Physical origins of this phenomenon, including a complex charge density wave domain structure of 1T-TiSe2, are being discussed in the second part of the work.
Author: Charles Sayers
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Tilman Butz
Publisher: Springer
ISBN: 9789401513005
Category :
Languages : en
Pages : 344
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Book Description
Nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), time differential perturbed angular correlations (TDPAC), and the Mossbauer effect (ME) have been applied to the study of charge density wave (CDW) systems. These hyperfine techniques provide unique tools to probe the structure and symmetry of commensurate CDWs, give a clear fingerprint of incommensurate CDWs, and are ideally suited for CDW dynamics. This book represents a new attempt in the series Physics and Chemistry of Materials with Low-dimensional Structures' to bring together a consistent group of scientific results obtained by nuclear spectroscopy related to CDW phenomena in pseudo-one- and two-dimensional systems. The individual chapters contain: the theory of CDWs in chain-like transition metal tetrachalcogenides; NMR, NQR, TDPAC, and ME investigations of layered transition metal dichalcogenides; NMR studies of CDW-transport in chain-like NbSe3 and molybdenum bronzes; multinuclear NMR of KCP; high resolution NMR of organic conductors. This book is of interest to graduate students and all scientists who want to acquire a broader knowledge of nuclear spectroscopy techniques applied to CDW systems.
Author: K. Motizuki
Publisher: Springer Science & Business Media
ISBN: 9400945760
Category : Science
Languages : en
Pages : 309
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Book Description
The structural phase transition is one of the most fundamental problems in solid state physics. Layered transition-metal dichalcogenides provide us with a most exciting area for the study of structural phase transitions that are associated with the charge density wave (CDW). A large variety of structural phase transitions, such as commensurate and incommensurate transitions, and the physical proper ties related to the formation of a CDW, have been an object of intense study made for many years by methods employing modem microscopic techniques. Rather recently, efforts have been devoted to the theoretical understanding of these experimental results. Thus, McMillan, for example, has developed an elegant phenomenological theory on the basis of the Landau free energy expansion. An extension of McMillan's theory has provided a successful understanding of the successive phase transitions observed in the IT- and 2H-compounds. In addition, a microscopic theory of lattice instability, lattice dynamics, and lattice distortion in the CDW state of the transition-metal dichalcogenides has been developed based on their electronic structures. As a result, the driving force of the CDW formation in the IT- and 2H-compounds has become clear. Furthermore, the effect of lattice fluctuations on the CDW transition and on the anomalous behavior of various physical properties has been made clear microscopically.
Author: YIZHI GE
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 242
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Another polymorph of TaSe2 is then investigated. We focus on the origin of the CDW instability in bulk and single-layer 2H-TaSe2. The role of interlayer interactions and the effect of spin-orbit coupling are examined. The results show that the CDW instability has weak dependence on interlayer interactions and spin-orbit coupling, which is in contrast to the closely related 2H-NbSe2 material, where the CDW ordering vector is predicted to depend on dimensionality.
Author: K Motizuki
Publisher:
ISBN: 9789400945777
Category :
Languages : en
Pages : 316
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Author: Bell Telephone Laboratories, inc. Technical Information Libraries
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 424
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