About: The effect of the phase transition on the optical properties of the lanthanum monopnictide compounds     Goto   Sponge   NotDistinct   Permalink

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  • Zde informujeme o výsledcích optických vlastností pro LaP a LaAs látek ve třech fázích: kamenná sůl (B1), CsCl-typ (B2) a primitivní čtyřúhelníková (PT) použitím potenciálové lineární metody rozšířených vln (FP-LAPW). Byla použita aproximace lokálních hustot (LDA) a Engel-Voskova aproximace zobecněného gradientu (EV-GGA). Pozorujeme, že pod 19 and 17 Gpa, LaP a LaAs zachovávají strukturu kamenné soli (B1). Poté při vysokém tlaku se vyskytuje krystalografický fázový přechod. Vysokotlaká stabilní fáze je čtyřúhelníková struktura. Zjistili jsme, že použití EV-GGA pro B1 fázi vedlo k tomu, že obě látky jsou polovodiče s nepřímou pásovou mezerou. I když pro fázi (B1) platí že, LDA vede k uzavření mezery při Fermiho energii, činí obě látky kovové v souladu s předchozím výpočtem. Pro PT a B2 fázi obě aproximace LDA a EV-GGA ukazují, že tyto látky jsou kovové. Studujeme účinek vysokého tlaku a použití různých aproximací na optických vlastnostech těchto látek. Spočítali jsme optickou vodivost a reflektivitu sp (cs)
  • We report results of the optical properties for LaP and LaAs compounds in three phases: rocksalt (B1), CsCl-type (B2) and primitive tetragonal (PT) using the full potential linearized augmented plane wave (FP-LAPW). The local-density approximation (LDA) and the Engel-Vosko-generalized gradient approximation (EV-GGA) were used. We notice that below 19 and 17 GPa respectively, LaP and LaAs maintain the rocksalt structure (B1). Then at high pressure a crystallographic phase transition occurs. The high pressure stabler phase is the tetragonal structure.We found that using EV-GGA for the B1 phase led to both compounds being semiconductors with an indirect band gap. While for the same phase (B1) the LDA leads to closure of the gap at the Fermi energy making the both compounds metallic in agreement with the previous calculation. For the PT and B2 phases both LDA and EV-GGA show these compounds as metallic. We study the effect of the high pressure and using different approximations on the optical properties o
  • We report results of the optical properties for LaP and LaAs compounds in three phases: rocksalt (B1), CsCl-type (B2) and primitive tetragonal (PT) using the full potential linearized augmented plane wave (FP-LAPW). The local-density approximation (LDA) and the Engel-Vosko-generalized gradient approximation (EV-GGA) were used. We notice that below 19 and 17 GPa respectively, LaP and LaAs maintain the rocksalt structure (B1). Then at high pressure a crystallographic phase transition occurs. The high pressure stabler phase is the tetragonal structure.We found that using EV-GGA for the B1 phase led to both compounds being semiconductors with an indirect band gap. While for the same phase (B1) the LDA leads to closure of the gap at the Fermi energy making the both compounds metallic in agreement with the previous calculation. For the PT and B2 phases both LDA and EV-GGA show these compounds as metallic. We study the effect of the high pressure and using different approximations on the optical properties o (en)
Title
  • The effect of the phase transition on the optical properties of the lanthanum monopnictide compounds
  • The effect of the phase transition on the optical properties of the lanthanum monopnictide compounds (en)
  • Účinek fázového přechodu na optických vlastnostech látek lanthanu monopnictide (cs)
skos:prefLabel
  • The effect of the phase transition on the optical properties of the lanthanum monopnictide compounds
  • The effect of the phase transition on the optical properties of the lanthanum monopnictide compounds (en)
  • Účinek fázového přechodu na optických vlastnostech látek lanthanu monopnictide (cs)
skos:notation
  • RIV/60076658:12640/08:00009382!RIV09-MSM-12640___
http://linked.open...avai/riv/aktivita
http://linked.open...avai/riv/aktivity
  • Z(MSM6007665808)
http://linked.open...iv/cisloPeriodika
  • 32
http://linked.open...vai/riv/dodaniDat
http://linked.open...aciTvurceVysledku
  • Reshak, Ali Hussain
http://linked.open.../riv/druhVysledku
http://linked.open...iv/duvernostUdaju
http://linked.open...titaPredkladatele
http://linked.open...dnocenehoVysledku
  • 365295
http://linked.open...ai/riv/idVysledku
  • RIV/60076658:12640/08:00009382
http://linked.open...riv/jazykVysledku
http://linked.open.../riv/klicovaSlova
  • Generalized Gradient Approximation; NaCl-Type Structure; Electronic-Structure; High-Pressures; Spectroscopy; Exchange; Solids; LaAs (en)
http://linked.open.../riv/klicoveSlovo
http://linked.open...odStatuVydavatele
  • GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV
  • [80284EEABE16]
http://linked.open...i/riv/nazevZdroje
  • Journal of Physics-Condensed Matter
http://linked.open...in/vavai/riv/obor
http://linked.open...ichTvurcuVysledku
http://linked.open...cetTvurcuVysledku
http://linked.open...UplatneniVysledku
http://linked.open...v/svazekPeriodika
  • 20
http://linked.open...iv/tvurceVysledku
  • Reshak, Ali Hussain
  • Baaziz, H.
  • Charifi, Z.
http://linked.open...ain/vavai/riv/wos
  • 000257841400014
http://linked.open...n/vavai/riv/zamer
issn
  • 0953-8984
number of pages
http://localhost/t...ganizacniJednotka
  • 12640
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