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The anomalous Hall effect and relate...

Lee, Wei-Li.

The anomalous Hall effect and related transport phenomena in ferromagnetic spinel copper chromium selenium bromide, manganese-doped chalcopyrite copper gallium ditelluride, and ruthenate bismuth ruthenate.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The anomalous Hall effect and related transport phenomena in ferromagnetic spinel copper chromium selenium bromide, manganese-doped chalcopyrite copper gallium ditelluride, and ruthenate bismuth ruthenate.
Author:	Lee, Wei-Li.
Description:	191 p.
Notes:	Adviser: N. P. Ong.
Notes:	Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6442.
Contained By:	Dissertation Abstracts International65-12B.
Subject:	Physics, Condensed Matter.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3156047
ISBN:	9780496166404

The anomalous Hall effect and related transport phenomena in ferromagnetic spinel copper chromium selenium bromide, manganese-doped chalcopyrite copper gallium ditelluride, and ruthenate bismuth ruthenate.
Lee, Wei-Li.

The anomalous Hall effect and related transport phenomena in ferromagnetic spinel copper chromium selenium bromide, manganese-doped chalcopyrite copper gallium ditelluride, and ruthenate bismuth ruthenate. - 191 p.

Adviser: N. P. Ong.

Thesis (Ph.D.)--Princeton University, 2005.

An alternative way to procure O is from the spin-chirality effect. In the Mn-doped chalcopyrite semiconductor CuGaTe2, with a few percent doping, the orbitals of the Mn ions overlap to form an impurity band. Therefore, the electrons will accumulate Berry phase while hopping around the Mn ions that have a non-collinear magnetic ground state. We observed the enhanced and non-monotonic field dependence of rhoxy, which may be understood from the spin-chirality effect. Finally, we studied the Hall effect and thermopower in the ruthenate Bi3Ru3O 11. From the Hall effect, we observed field-tuning of electron and hole populations. We also found a large field dependence of the thermopower at low temperature. The origin of the colossal field-dependence in the thermopower is still an open question, but it is linked to the unusual electronic properties in the Bi3Ru3O11.

ISBN: 9780496166404Subjects--Topical Terms:

226939
Physics, Condensed Matter.

The anomalous Hall effect and related transport phenomena in ferromagnetic spinel copper chromium selenium bromide, manganese-doped chalcopyrite copper gallium ditelluride, and ruthenate bismuth ruthenate.
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100 0 $a Lee, Wei-Li. $3 244612
245 1 4 $a The anomalous Hall effect and related transport phenomena in ferromagnetic spinel copper chromium selenium bromide, manganese-doped chalcopyrite copper gallium ditelluride, and ruthenate bismuth ruthenate.
300 $a 191 p.
500 $a Adviser: N. P. Ong.
500 $a Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6442.
502 $a Thesis (Ph.D.)--Princeton University, 2005.
520 # $a An alternative way to procure O is from the spin-chirality effect. In the Mn-doped chalcopyrite semiconductor CuGaTe2, with a few percent doping, the orbitals of the Mn ions overlap to form an impurity band. Therefore, the electrons will accumulate Berry phase while hopping around the Mn ions that have a non-collinear magnetic ground state. We observed the enhanced and non-monotonic field dependence of rhoxy, which may be understood from the spin-chirality effect. Finally, we studied the Hall effect and thermopower in the ruthenate Bi3Ru3O 11. From the Hall effect, we observed field-tuning of electron and hole populations. We also found a large field dependence of the thermopower at low temperature. The origin of the colossal field-dependence in the thermopower is still an open question, but it is linked to the unusual electronic properties in the Bi3Ru3O11.
520 # $a One of the interesting and unsettled transport phenomena is the, so called, "anomalous Hall Effect". It generally refers to the phenomenon of a non-linear field dependence of the Hall resistivity rhoxy. An emerging idea relates to the "gauge field O" experienced by electrons. It gives rise to Berry phase accumulation. In ferromagnets, a non-vanishing O( k&ar; ) is related to the spin-orbit coupling and the time-reversal asymmetry. We show that, in the ferromagnetic spinel CuCr2Se 4-xBrx, the anomalous Hall conductivity sigma xy (normalized to per carrier, at 5K) remains unchanged with a 1000-fold increase in resistivity. From the anomalous Nernst effect, we uncover a simple relation for the off-diagonal Peltier conductivity tensor alphaxy, which is a measure of a transverse electrical current density generated per unit of applied temperature gradient. They both strongly support the anomalous-velocity theory based on the intrinsic spin-orbit coupling of the electrons.
590 $a School code: 0181.
650 # 0 $a Physics, Condensed Matter. $3 226939
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790 1 0 $a Ong, N. P., $e advisor
791 $a Ph.D.
792 $a 2005
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