Optic phonons and the soft mode in 2H-NbSe2

We present an investigation of the lattice dynamics of the charge-density-wave compound 2H-NbSe2. We analyze the precise nature of the wave vector dependent electron-phonon coupling (EPC) and derive the bare dispersion of the charge-density-wave (CDW) soft phonon mode using inelastic x-ray scatterin...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2013-05
Main Authors: Weber, F, Hott, R, Heid, R, K -P Bohnen, Rosenkranz, S, J -P Castellan, Osborn, R, A H Said B M Leu, Reznik, D
Format: Article
Language:English
Subjects:
Charge density waves
Fermi surfaces
Inelastic scattering
Lattice vibration
Mathematical analysis
Phonons
X-ray scattering
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
cited_by
cites
container_end_page
container_issue
container_start_page
container_title arXiv.org
container_volume
creator Weber, F
Hott, R
Heid, R
K -P Bohnen
Rosenkranz, S
J -P Castellan
Osborn, R
A H Said B M Leu
Reznik, D
description We present an investigation of the lattice dynamics of the charge-density-wave compound 2H-NbSe2. We analyze the precise nature of the wave vector dependent electron-phonon coupling (EPC) and derive the bare dispersion of the charge-density-wave (CDW) soft phonon mode using inelastic x-ray scattering combined with ab-initio calculations. Experimentally, phonon modes along the {\Gamma} - M line, i.e. q = (h, 0, 0) with 0
doi_str_mv 10.48550/arxiv.1303.6503
format article
fullrecord <record><control><sourceid>proquest</sourceid><recordid>TN_cdi_proquest_journals_2082803653</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2082803653</sourcerecordid><originalsourceid>FETCH-LOGICAL-a513-b53c932aef62637e6b40e03c1d50c5add9ca78626c8f75a104446c2266cab5953</originalsourceid><addsrcrecordid>eNotjUFLwzAYQIMgbMzddwx4lNQv35cvTY8y1A2GO7j7SNOUdWhTm078-Q709A4P3hNipaEwjhke_fjTfReagArLQDdijkRaOYM4E8uczwCAtkRmmouH_TB1QQ6n1Kc-S983cjpFmVM7yc_URNn1EjfqrX6PeCduW_-R4_KfC3F4eT6sN2q3f92un3bKsyZVM4WK0MfWoqUy2tpABAq6YQjsm6YKvnRXF1xbstdgjLEB0drga66YFuL-LzuM6esS83Q8p8vYX49HBIcOyDLRL1lKQNs</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2082803653</pqid></control><display><type>article</type><title>Optic phonons and the soft mode in 2H-NbSe2</title><source>Publicly Available Content (ProQuest)</source><creator>Weber, F ; Hott, R ; Heid, R ; K -P Bohnen ; Rosenkranz, S ; J -P Castellan ; Osborn, R ; A H Said B M Leu ; Reznik, D</creator><creatorcontrib>Weber, F ; Hott, R ; Heid, R ; K -P Bohnen ; Rosenkranz, S ; J -P Castellan ; Osborn, R ; A H Said B M Leu ; Reznik, D</creatorcontrib><description>We present an investigation of the lattice dynamics of the charge-density-wave compound 2H-NbSe2. We analyze the precise nature of the wave vector dependent electron-phonon coupling (EPC) and derive the bare dispersion of the charge-density-wave (CDW) soft phonon mode using inelastic x-ray scattering combined with ab-initio calculations. Experimentally, phonon modes along the {\Gamma} - M line, i.e. q = (h, 0, 0) with 0 &lt;= h &lt;= 0.5, with the same longitudinal symmetry ({\Sigma}1) as the CDW soft mode were investigated up to 32 meV. In agreement with our calculations we observe significant EPC in the optic modes at h &lt;= 0.2. We analyze the EPC in the optic as well as acoustic modes and show that the q dependences stem from scattering processes between two bands at the Fermi surface both having Nb 4d character. Finally, we demonstrate that the soft mode dispersion at T = 33 K (= {T_{CDW}}) can be well described on the basis of a strongly q dependent EPC matrix element and an acoustic-like bare phonon dispersion in agreement with observations near room temperature.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1303.6503</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Charge density waves ; Fermi surfaces ; Inelastic scattering ; Lattice vibration ; Mathematical analysis ; Phonons ; X-ray scattering</subject><ispartof>arXiv.org, 2013-05</ispartof><rights>2013. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.proquest.com/docview/2082803653?pq-origsite=primo$$EHTML$$P50$$Gproquest$$Hfree_for_read</linktohtml><link.rule.ids>780,784,25752,27924,37011,44589</link.rule.ids></links><search><creatorcontrib>Weber, F</creatorcontrib><creatorcontrib>Hott, R</creatorcontrib><creatorcontrib>Heid, R</creatorcontrib><creatorcontrib>K -P Bohnen</creatorcontrib><creatorcontrib>Rosenkranz, S</creatorcontrib><creatorcontrib>J -P Castellan</creatorcontrib><creatorcontrib>Osborn, R</creatorcontrib><creatorcontrib>A H Said B M Leu</creatorcontrib><creatorcontrib>Reznik, D</creatorcontrib><title>Optic phonons and the soft mode in 2H-NbSe2</title><title>arXiv.org</title><description>We present an investigation of the lattice dynamics of the charge-density-wave compound 2H-NbSe2. We analyze the precise nature of the wave vector dependent electron-phonon coupling (EPC) and derive the bare dispersion of the charge-density-wave (CDW) soft phonon mode using inelastic x-ray scattering combined with ab-initio calculations. Experimentally, phonon modes along the {\Gamma} - M line, i.e. q = (h, 0, 0) with 0 &lt;= h &lt;= 0.5, with the same longitudinal symmetry ({\Sigma}1) as the CDW soft mode were investigated up to 32 meV. In agreement with our calculations we observe significant EPC in the optic modes at h &lt;= 0.2. We analyze the EPC in the optic as well as acoustic modes and show that the q dependences stem from scattering processes between two bands at the Fermi surface both having Nb 4d character. Finally, we demonstrate that the soft mode dispersion at T = 33 K (= {T_{CDW}}) can be well described on the basis of a strongly q dependent EPC matrix element and an acoustic-like bare phonon dispersion in agreement with observations near room temperature.</description><subject>Charge density waves</subject><subject>Fermi surfaces</subject><subject>Inelastic scattering</subject><subject>Lattice vibration</subject><subject>Mathematical analysis</subject><subject>Phonons</subject><subject>X-ray scattering</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>PIMPY</sourceid><recordid>eNotjUFLwzAYQIMgbMzddwx4lNQv35cvTY8y1A2GO7j7SNOUdWhTm078-Q709A4P3hNipaEwjhke_fjTfReagArLQDdijkRaOYM4E8uczwCAtkRmmouH_TB1QQ6n1Kc-S983cjpFmVM7yc_URNn1EjfqrX6PeCduW_-R4_KfC3F4eT6sN2q3f92un3bKsyZVM4WK0MfWoqUy2tpABAq6YQjsm6YKvnRXF1xbstdgjLEB0drga66YFuL-LzuM6esS83Q8p8vYX49HBIcOyDLRL1lKQNs</recordid><startdate>20130523</startdate><enddate>20130523</enddate><creator>Weber, F</creator><creator>Hott, R</creator><creator>Heid, R</creator><creator>K -P Bohnen</creator><creator>Rosenkranz, S</creator><creator>J -P Castellan</creator><creator>Osborn, R</creator><creator>A H Said B M Leu</creator><creator>Reznik, D</creator><general>Cornell University Library, arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope></search><sort><creationdate>20130523</creationdate><title>Optic phonons and the soft mode in 2H-NbSe2</title><author>Weber, F ; Hott, R ; Heid, R ; K -P Bohnen ; Rosenkranz, S ; J -P Castellan ; Osborn, R ; A H Said B M Leu ; Reznik, D</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a513-b53c932aef62637e6b40e03c1d50c5add9ca78626c8f75a104446c2266cab5953</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Charge density waves</topic><topic>Fermi surfaces</topic><topic>Inelastic scattering</topic><topic>Lattice vibration</topic><topic>Mathematical analysis</topic><topic>Phonons</topic><topic>X-ray scattering</topic><toplevel>online_resources</toplevel><creatorcontrib>Weber, F</creatorcontrib><creatorcontrib>Hott, R</creatorcontrib><creatorcontrib>Heid, R</creatorcontrib><creatorcontrib>K -P Bohnen</creatorcontrib><creatorcontrib>Rosenkranz, S</creatorcontrib><creatorcontrib>J -P Castellan</creatorcontrib><creatorcontrib>Osborn, R</creatorcontrib><creatorcontrib>A H Said B M Leu</creatorcontrib><creatorcontrib>Reznik, D</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science &amp; Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central</collection><collection>ProQuest Central Essentials</collection><collection>AUTh Library subscriptions: ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Publicly Available Content (ProQuest)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Weber, F</au><au>Hott, R</au><au>Heid, R</au><au>K -P Bohnen</au><au>Rosenkranz, S</au><au>J -P Castellan</au><au>Osborn, R</au><au>A H Said B M Leu</au><au>Reznik, D</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Optic phonons and the soft mode in 2H-NbSe2</atitle><jtitle>arXiv.org</jtitle><date>2013-05-23</date><risdate>2013</risdate><eissn>2331-8422</eissn><abstract>We present an investigation of the lattice dynamics of the charge-density-wave compound 2H-NbSe2. We analyze the precise nature of the wave vector dependent electron-phonon coupling (EPC) and derive the bare dispersion of the charge-density-wave (CDW) soft phonon mode using inelastic x-ray scattering combined with ab-initio calculations. Experimentally, phonon modes along the {\Gamma} - M line, i.e. q = (h, 0, 0) with 0 &lt;= h &lt;= 0.5, with the same longitudinal symmetry ({\Sigma}1) as the CDW soft mode were investigated up to 32 meV. In agreement with our calculations we observe significant EPC in the optic modes at h &lt;= 0.2. We analyze the EPC in the optic as well as acoustic modes and show that the q dependences stem from scattering processes between two bands at the Fermi surface both having Nb 4d character. Finally, we demonstrate that the soft mode dispersion at T = 33 K (= {T_{CDW}}) can be well described on the basis of a strongly q dependent EPC matrix element and an acoustic-like bare phonon dispersion in agreement with observations near room temperature.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1303.6503</doi><oa>free_for_read</oa></addata></record>
fulltext fulltext
identifier EISSN: 2331-8422
ispartof arXiv.org, 2013-05
issn 2331-8422
language eng
recordid cdi_proquest_journals_2082803653
source Publicly Available Content (ProQuest)
subjects Charge density waves
Fermi surfaces
Inelastic scattering
Lattice vibration
Mathematical analysis
Phonons
X-ray scattering
title Optic phonons and the soft mode in 2H-NbSe2
url http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-11T05%3A58%3A10IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Optic%20phonons%20and%20the%20soft%20mode%20in%202H-NbSe2&rft.jtitle=arXiv.org&rft.au=Weber,%20F&rft.date=2013-05-23&rft.eissn=2331-8422&rft_id=info:doi/10.48550/arxiv.1303.6503&rft_dat=%3Cproquest%3E2082803653%3C/proquest%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-a513-b53c932aef62637e6b40e03c1d50c5add9ca78626c8f75a104446c2266cab5953%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_pqid=2082803653&rft_id=info:pmid/&rfr_iscdi=true