Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Materials research (São Carlos. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000800211 |
Resumo: | We have studied the thickness and quench-rate dependent internal friction of amorphous selenium (a-Se) thin films deposited at room temperature. The internal friction of a-Se films exhibit a temperature independent plateau below 1 K followed by a broad maximum at 10 K. The plateau, which is seen in almost all amorphous solids, is caused by dissipation by two-level tunneling systems (TLS), whose origin is still unknown. The maximum is caused by thermal relaxation over the same energy barrier that induces TLS. The internal friction and shear modulus are almost thickness independent from 100 nm to 10 µm. Unlike other elemental amorphous materials, the sufficiently low glass transition temperature (Tg) of a-Se (only about 10 K above room temperature) allows in-situ quench-rate dependent study of TLS. The amorphous structure resets itself by a thermal equilibration cycle above Tg. We show that a faster quench rate freezes a-Se to a lower density structure with a higher TLS density and vice versa. The changes are reversible supporting a relationship between different quenched states and the density of TLS. Our study shows that a-Se can be a simple monatomic amorphous system to constrain models for the origin of TLS in amorphous solids. |
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Materials research (São Carlos. Online) |
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Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction MeasurementsInternal frictionamorphous seleniumelastic modulusspeed of soundtunneling systemsglass transitionWe have studied the thickness and quench-rate dependent internal friction of amorphous selenium (a-Se) thin films deposited at room temperature. The internal friction of a-Se films exhibit a temperature independent plateau below 1 K followed by a broad maximum at 10 K. The plateau, which is seen in almost all amorphous solids, is caused by dissipation by two-level tunneling systems (TLS), whose origin is still unknown. The maximum is caused by thermal relaxation over the same energy barrier that induces TLS. The internal friction and shear modulus are almost thickness independent from 100 nm to 10 µm. Unlike other elemental amorphous materials, the sufficiently low glass transition temperature (Tg) of a-Se (only about 10 K above room temperature) allows in-situ quench-rate dependent study of TLS. The amorphous structure resets itself by a thermal equilibration cycle above Tg. We show that a faster quench rate freezes a-Se to a lower density structure with a higher TLS density and vice versa. The changes are reversible supporting a relationship between different quenched states and the density of TLS. Our study shows that a-Se can be a simple monatomic amorphous system to constrain models for the origin of TLS in amorphous solids.ABM, ABC, ABPol2018-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000800211Materials Research v.21 suppl.2 2018reponame:Materials research (São Carlos. Online)instname:Universidade Federal de São Carlos (UFSCAR)instacron:ABM ABC ABPOL10.1590/1980-5373-mr-2017-0881info:eu-repo/semantics/openAccessLiu,XiaoMetcalf,Thomas HarkerAbernathy,Matthew RobertStephen,Richard Burniteeng2018-06-05T00:00:00Zoai:scielo:S1516-14392018000800211Revistahttp://www.scielo.br/mrPUBhttps://old.scielo.br/oai/scielo-oai.phpdedz@power.ufscar.br1980-53731516-1439opendoar:2018-06-05T00:00Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.none.fl_str_mv |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements |
title |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements |
spellingShingle |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements Liu,Xiao Internal friction amorphous selenium elastic modulus speed of sound tunneling systems glass transition |
title_short |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements |
title_full |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements |
title_fullStr |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements |
title_full_unstemmed |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements |
title_sort |
Manipulation of Glassy State in Amorphous Selenium by Low-temperature Internal Friction Measurements |
author |
Liu,Xiao |
author_facet |
Liu,Xiao Metcalf,Thomas Harker Abernathy,Matthew Robert Stephen,Richard Burnite |
author_role |
author |
author2 |
Metcalf,Thomas Harker Abernathy,Matthew Robert Stephen,Richard Burnite |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Liu,Xiao Metcalf,Thomas Harker Abernathy,Matthew Robert Stephen,Richard Burnite |
dc.subject.por.fl_str_mv |
Internal friction amorphous selenium elastic modulus speed of sound tunneling systems glass transition |
topic |
Internal friction amorphous selenium elastic modulus speed of sound tunneling systems glass transition |
description |
We have studied the thickness and quench-rate dependent internal friction of amorphous selenium (a-Se) thin films deposited at room temperature. The internal friction of a-Se films exhibit a temperature independent plateau below 1 K followed by a broad maximum at 10 K. The plateau, which is seen in almost all amorphous solids, is caused by dissipation by two-level tunneling systems (TLS), whose origin is still unknown. The maximum is caused by thermal relaxation over the same energy barrier that induces TLS. The internal friction and shear modulus are almost thickness independent from 100 nm to 10 µm. Unlike other elemental amorphous materials, the sufficiently low glass transition temperature (Tg) of a-Se (only about 10 K above room temperature) allows in-situ quench-rate dependent study of TLS. The amorphous structure resets itself by a thermal equilibration cycle above Tg. We show that a faster quench rate freezes a-Se to a lower density structure with a higher TLS density and vice versa. The changes are reversible supporting a relationship between different quenched states and the density of TLS. Our study shows that a-Se can be a simple monatomic amorphous system to constrain models for the origin of TLS in amorphous solids. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000800211 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392018000800211 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1980-5373-mr-2017-0881 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
ABM, ABC, ABPol |
publisher.none.fl_str_mv |
ABM, ABC, ABPol |
dc.source.none.fl_str_mv |
Materials Research v.21 suppl.2 2018 reponame:Materials research (São Carlos. Online) instname:Universidade Federal de São Carlos (UFSCAR) instacron:ABM ABC ABPOL |
instname_str |
Universidade Federal de São Carlos (UFSCAR) |
instacron_str |
ABM ABC ABPOL |
institution |
ABM ABC ABPOL |
reponame_str |
Materials research (São Carlos. Online) |
collection |
Materials research (São Carlos. Online) |
repository.name.fl_str_mv |
Materials research (São Carlos. Online) - Universidade Federal de São Carlos (UFSCAR) |
repository.mail.fl_str_mv |
dedz@power.ufscar.br |
_version_ |
1754212673665368064 |