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Angle-resolved photoemission spectro...

Shai, Daniel Edward.

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Angle-resolved photoemission spectroscopy of ferromagnetic EuO and SrRuO3 thin films.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Angle-resolved photoemission spectroscopy of ferromagnetic EuO and SrRuO3 thin films./
作者:	Shai, Daniel Edward.
面頁冊數:	176 p.
附註:	Source: Dissertation Abstracts International, Volume: 75-11(E), Section: B.
Contained By:	Dissertation Abstracts International75-11B(E).
標題:	Condensed matter physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3583201
ISBN:	9781321126587

Angle-resolved photoemission spectroscopy of ferromagnetic EuO and SrRuO3 thin films.
Shai, Daniel Edward.

Angle-resolved photoemission spectroscopy of ferromagnetic EuO and SrRuO3 thin films. - 176 p.

Source: Dissertation Abstracts International, Volume: 75-11(E), Section: B.

Thesis (Ph.D.)--Cornell University, 2014.

This item is not available from ProQuest Dissertations & Theses.

Complex oxides are intensely studied due to their attractive materials properties, including a vast array of tunable and exotic electronic and magnetic phases. Experimental measurement of their electronic properties is a necessary first step toward understanding these materials and their ultimate utilization. In this thesis we describe the development and implementation of a state-of-the-art instrument which allows us to grow "artificial" structures of complex oxide thin films by molecular-beam epitaxy (MBE) and directly measure their momentum-resolved electronic structure using angle-resolved photoelectron spectroscopy (ARPES). We use this instrument to explore the momentum-resolved electronic properties of two ferromagnetic complex oxide materials, EuO and SrRuO3.

ISBN: 9781321126587Subjects--Topical Terms:

3173567
Condensed matter physics.

Angle-resolved photoemission spectroscopy of ferromagnetic EuO and SrRuO3 thin films.
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100 1 $a Shai, Daniel Edward. $3 3180923
245 1 0 $a Angle-resolved photoemission spectroscopy of ferromagnetic EuO and SrRuO3 thin films.
300 $a 176 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-11(E), Section: B.
500 $a Adviser: Kyle Shen.
502 $a Thesis (Ph.D.)--Cornell University, 2014.
506 $a This item is not available from ProQuest Dissertations & Theses.
520 $a Complex oxides are intensely studied due to their attractive materials properties, including a vast array of tunable and exotic electronic and magnetic phases. Experimental measurement of their electronic properties is a necessary first step toward understanding these materials and their ultimate utilization. In this thesis we describe the development and implementation of a state-of-the-art instrument which allows us to grow "artificial" structures of complex oxide thin films by molecular-beam epitaxy (MBE) and directly measure their momentum-resolved electronic structure using angle-resolved photoelectron spectroscopy (ARPES). We use this instrument to explore the momentum-resolved electronic properties of two ferromagnetic complex oxide materials, EuO and SrRuO3.
520 $a We first present ARPES measurements on the doped ferromagnetic metal-insulator compound EuO. Our measurements in the low temperature ferromagnetic metallic state reveal charge carriers at the Brillouin zone boundary, consistent with density functional theory calculations, which predicts a half metal. Upon warming to the paramagnetic phase, the metallic states at the zone boundary are transferred to pseudogapped states at the zone center. Our measurements also reveal a third type of charge carrier, which exists at Gamma at all temperatures and corresponds to inactive dopants.
520 $a Through doping dependent measurements of EuO, we reveal a systematic evolution of the EuO valence band, which exhibits a diminished redshift and band gap, the later of which is consistent with dopant induced strain as indicated by first principles calculations. Near the Fermi level, we discuss the pseudogapped states in terms of semi-localized charge carriers and present model calculations to support this. Finally, we discuss the formation of a two-dimensional free electron gas formed using deposition of Cs on the surface of EuO.
520 $a We then discuss the ferromagnetic 4d perovkite SrRuO 3. The Fermi surface in the ferromagnetic state consists of well-defined Landau quasiparticles exhibiting strong coupling to low-energy bosonic modes which contributes to the large effective masses observed by transport and thermodynamic measurements. Upon warming the material through its Curie temperature, we observe a substantial decrease in quasiparticle coherence but negligible changes in the ferromagnetic exchange splitting, suggesting that local moments play an important role in the ferromagnetism in SrRuO3.
590 $a School code: 0058.
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Materials science. $3 543314
690 $a 0611
690 $a 0794
710 2 $a Cornell University. $b Physics. $3 3173885
773 0 $t Dissertation Abstracts International $g 75-11B(E).
790 $a 0058
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3583201