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Electron spectroscopy studies of str...

Mo, Sung-Kwan.

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Electron spectroscopy studies of strongly correlated vanadium compounds.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Electron spectroscopy studies of strongly correlated vanadium compounds./
作者:	Mo, Sung-Kwan.
面頁冊數:	163 p.
附註:	Source: Dissertation Abstracts International, Volume: 67-07, Section: B, page: 3857.
Contained By:	Dissertation Abstracts International67-07B.
標題:	Physics, Electricity and Magnetism. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3224702
ISBN:	9780542789618

Electron spectroscopy studies of strongly correlated vanadium compounds.
Mo, Sung-Kwan.

Electron spectroscopy studies of strongly correlated vanadium compounds. - 163 p.

Source: Dissertation Abstracts International, Volume: 67-07, Section: B, page: 3857.

Thesis (Ph.D.)--University of Michigan, 2006.

The electronic structure of strongly correlated vanadium compounds has been investigated using electron spectroscopy as the main experimental tool. The underlying theme of the thesis is to examine exotic ground states and phase transitions which result from the competition between localized and delocalized characters of 3d electrons, the interactions among different degrees of freedom, and the effect of confining geometries such as low-dimensionality and geometrical frustration.

ISBN: 9780542789618Subjects--Topical Terms:

1019535
Physics, Electricity and Magnetism.

Electron spectroscopy studies of strongly correlated vanadium compounds.
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100 1 $a Mo, Sung-Kwan. $3 1919112
245 1 0 $a Electron spectroscopy studies of strongly correlated vanadium compounds.
300 $a 163 p.
500 $a Source: Dissertation Abstracts International, Volume: 67-07, Section: B, page: 3857.
500 $a Adviser: James W. Allen.
502 $a Thesis (Ph.D.)--University of Michigan, 2006.
520 $a The electronic structure of strongly correlated vanadium compounds has been investigated using electron spectroscopy as the main experimental tool. The underlying theme of the thesis is to examine exotic ground states and phase transitions which result from the competition between localized and delocalized characters of 3d electrons, the interactions among different degrees of freedom, and the effect of confining geometries such as low-dimensionality and geometrical frustration.
520 $a (V1-xMx) 2O3 (M=Cr, Ti) is a paradigm Mott-Hubbard (MH) metal-insulator transition system. High-photon-energy bulk-sensitive photoemission spectroscopy (PES) shows a prominent quasi-particle (QP) peak at the Fermi energy ( EF) in the paramagnetic metal phase. The peak is in a good general agreement with theoretical predictions from the local density approximation of band theory combined with dynamical mean-field theory (LDA+DMFT). This is the first observation of such a QP peak after continuing efforts for more than 20 years. The observation was enabled by using a new bulk-sensitive PES technique. PES spectra of the PI Phase (V0.972Cr0.028 )2O3, taken at unusually high temperatures ( T) up to 800 K, show that with increasing T the MH gap is filled by a transfer of incoherent spectral weight from the high binding energy region, in qualitative agreement with high-T LDA+DMFT calculations. This reveals an important yet often-ignored aspect of the Mott insulator in contrast to the behavior of a band insulator, where increasing T creates electron-hole excitations across a rigid gap.
520 $a Angle-resolved PES (ARPES) spectra of quasi-one-dimensional beta'-Cu xV2O5 (x = 0.33 - 0.65) and BaVS3 in the metallic phase show dispersing bands along, but not perpendicular to the chain direction. No distinct Fermi edge is observed even in the metallic phase spectra of either material. For beta'-Cu xV2O5 we infer that electrons are distributed in a 1:2 ratio into two of the three species of vanadium oxide chains, using electron counting consideration and the ARPES results. In BaVS3, the ARPES results suggest that part of the electrons are localized in the V 3d epg orbital and are responsible for the local moment observed in the magnetic susceptibility.
520 $a LiV2O4 is the first known 3d-electron heavy fermion system. In high-energy PES spectra, a prominent E F peak and a broad peak near -1.2 eV are observed, just as in spectra of the metallic phase of V2O3. The relative intensity of the EF peak with respect to the -1.2 eV peak shows a subtle increase with decreasing T, which may be interpreted as a Kondo resonance or equivalently as a QP peak. However, the existence of photon induced sample damage, which may be intertwined with the actual T-dependence of the PES spectra, precludes reaching a firm conclusion.
590 $a School code: 0127.
650 4 $a Physics, Electricity and Magnetism. $3 1019535
650 4 $a Physics, Condensed Matter. $3 1018743
690 $a 0607
690 $a 0611
710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 67-07B.
790 1 0 $a Allen, James W., $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3224702