Superconductivity in the heavy fermion system Pr0s4Sb12
Thesis (Ph.D.)--Memorial University of Newfoundland, 2008. Physics and Physical Oceanography Includes bibliographical references (leaves 101-110) Superconductivity was observed in the Pr-filled skutterudite heavy fermion system PrOs4 Sb12 in 2002. Symmetry considerations, based on the Landau theory...
Main Author: | |
---|---|
Other Authors: | |
Format: | Thesis |
Language: | English |
Published: |
2008
|
Subjects: | |
Online Access: | http://collections.mun.ca/cdm/ref/collection/theses4/id/78586 |
id |
ftmemorialunivdc:oai:collections.mun.ca:theses4/78586 |
---|---|
record_format |
openpolar |
spelling |
ftmemorialunivdc:oai:collections.mun.ca:theses4/78586 2023-05-15T17:23:33+02:00 Superconductivity in the heavy fermion system Pr0s4Sb12 Abu Alrub, Tayseer Rafe, 1976- Memorial University of Newfoundland. Dept. of Physics and Physical Oceanography 2008 x, 110 leaves : col. ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses4/id/78586 Eng eng Electronic Theses and Dissertations (12.49 MB) -- http://collections.mun.ca/PDFs/theses/AbuAlrub_TayseerRafe.pdf a2700614 http://collections.mun.ca/cdm/ref/collection/theses4/id/78586 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Fermions--Thermal conductivity Group theory Superconductivity Text Electronic thesis or dissertation 2008 ftmemorialunivdc 2015-08-06T19:22:11Z Thesis (Ph.D.)--Memorial University of Newfoundland, 2008. Physics and Physical Oceanography Includes bibliographical references (leaves 101-110) Superconductivity was observed in the Pr-filled skutterudite heavy fermion system PrOs4 Sb12 in 2002. Symmetry considerations, based on the Landau theory of second order phase transitions, were used to derive all possible superconducting states in this material. It was found that a three-component order parameter that belongs to the Tu irreducible representation of the tetrahedral point group Th best describes superconductivity in PrOs4 Sb 12 . Two different superconducting phases have been observed in PrOs 4 Sb12 the lower temperature B phase occupies the bulk of the phase diagram, while the higher temperature A phase is found in a narrow region below Hc2 , and possibly does not exist at all. The proposed gap function in the A phase is unitary and has two point nodes in the [00 ± 1] directions. In the B phase, the proposed gap function is nonunitary and the lower branch has four point nodes in the [±α, 0, ±β] directions. Hence, thermodynamic and transport properties of a nonunitary superconducting state are analyzed. It is shown that the conductivity tensor has inequivalent diagonal components due to the off-axis nodal positions of the B phase. Moreover, nonuniversal conductivities (impurity scattering dependent) have been obtained. A semi-classical approach based on the Doppler shift of the quasiparticle energy is used to calculate the oscillatory past of the magnetic field-angle dependent density of states and thermal conductivity. All possible point node configurations for superconducting phases of a tetrahedral superconductor are considered. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
institution |
Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Fermions--Thermal conductivity Group theory Superconductivity |
spellingShingle |
Fermions--Thermal conductivity Group theory Superconductivity Abu Alrub, Tayseer Rafe, 1976- Superconductivity in the heavy fermion system Pr0s4Sb12 |
topic_facet |
Fermions--Thermal conductivity Group theory Superconductivity |
description |
Thesis (Ph.D.)--Memorial University of Newfoundland, 2008. Physics and Physical Oceanography Includes bibliographical references (leaves 101-110) Superconductivity was observed in the Pr-filled skutterudite heavy fermion system PrOs4 Sb12 in 2002. Symmetry considerations, based on the Landau theory of second order phase transitions, were used to derive all possible superconducting states in this material. It was found that a three-component order parameter that belongs to the Tu irreducible representation of the tetrahedral point group Th best describes superconductivity in PrOs4 Sb 12 . Two different superconducting phases have been observed in PrOs 4 Sb12 the lower temperature B phase occupies the bulk of the phase diagram, while the higher temperature A phase is found in a narrow region below Hc2 , and possibly does not exist at all. The proposed gap function in the A phase is unitary and has two point nodes in the [00 ± 1] directions. In the B phase, the proposed gap function is nonunitary and the lower branch has four point nodes in the [±α, 0, ±β] directions. Hence, thermodynamic and transport properties of a nonunitary superconducting state are analyzed. It is shown that the conductivity tensor has inequivalent diagonal components due to the off-axis nodal positions of the B phase. Moreover, nonuniversal conductivities (impurity scattering dependent) have been obtained. A semi-classical approach based on the Doppler shift of the quasiparticle energy is used to calculate the oscillatory past of the magnetic field-angle dependent density of states and thermal conductivity. All possible point node configurations for superconducting phases of a tetrahedral superconductor are considered. |
author2 |
Memorial University of Newfoundland. Dept. of Physics and Physical Oceanography |
format |
Thesis |
author |
Abu Alrub, Tayseer Rafe, 1976- |
author_facet |
Abu Alrub, Tayseer Rafe, 1976- |
author_sort |
Abu Alrub, Tayseer Rafe, 1976- |
title |
Superconductivity in the heavy fermion system Pr0s4Sb12 |
title_short |
Superconductivity in the heavy fermion system Pr0s4Sb12 |
title_full |
Superconductivity in the heavy fermion system Pr0s4Sb12 |
title_fullStr |
Superconductivity in the heavy fermion system Pr0s4Sb12 |
title_full_unstemmed |
Superconductivity in the heavy fermion system Pr0s4Sb12 |
title_sort |
superconductivity in the heavy fermion system pr0s4sb12 |
publishDate |
2008 |
url |
http://collections.mun.ca/cdm/ref/collection/theses4/id/78586 |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (12.49 MB) -- http://collections.mun.ca/PDFs/theses/AbuAlrub_TayseerRafe.pdf a2700614 http://collections.mun.ca/cdm/ref/collection/theses4/id/78586 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766113271213981696 |