Conductive properties of heavy-rare-earth A2Ir2O7 iridates synthesized by the CsCl-flux method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F23%3A10468619" target="_blank" >RIV/00216208:11320/23:10468619 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5D.LvvK1hb" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=5D.LvvK1hb</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpcs.2023.111268" target="_blank" >10.1016/j.jpcs.2023.111268</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Conductive properties of heavy-rare-earth A2Ir2O7 iridates synthesized by the CsCl-flux method

Popis výsledku v původním jazyce

The A2Ir2O7 pyrochlores with A = rare-earth element have been the subject of intense scientific interest for their complex magnetic and conductive properties. The previous studies focused mainly on the light A members of the series. We report on the electrical resistivity and magnetoresistance of the heavy-rare-earth iridates (A = Dy -Lu), including newly synthesized Tm2Ir2O7 member. The measurements were performed on pelletized powder samples synthesized using the CsCl-flux. The transition from the semimetal/semiconductor to the insulating state is followed within the series. Related anomaly in electrical resistivity continuously broadens coming from A = Dy to Lu. Electrical resistivity increases by several orders (up to 6) of magnitude with decreasing temperature down to 2 K. The nature of the transition to the insulating state was discussed in the frame of various models, leaning towards the Slater mechanism without Brillouin zone-folding. Investigated iridates become insulating due to an opening of a gap at the Fermi level induced by the antiferromagnetic ordering. A negative magnetoresistance was observed for all members of the series. The highest resistivity drop to 8% of the zero-field value was revealed for Dy2Ir2O7. Ferromagnetic Ir domain walls between antiferromagnetic domains were discussed to influence the measured quantities for A2Ir2O7 iridates.

Název v anglickém jazyce

Conductive properties of heavy-rare-earth A2Ir2O7 iridates synthesized by the CsCl-flux method

Popis výsledku anglicky

The A2Ir2O7 pyrochlores with A = rare-earth element have been the subject of intense scientific interest for their complex magnetic and conductive properties. The previous studies focused mainly on the light A members of the series. We report on the electrical resistivity and magnetoresistance of the heavy-rare-earth iridates (A = Dy -Lu), including newly synthesized Tm2Ir2O7 member. The measurements were performed on pelletized powder samples synthesized using the CsCl-flux. The transition from the semimetal/semiconductor to the insulating state is followed within the series. Related anomaly in electrical resistivity continuously broadens coming from A = Dy to Lu. Electrical resistivity increases by several orders (up to 6) of magnitude with decreasing temperature down to 2 K. The nature of the transition to the insulating state was discussed in the frame of various models, leaning towards the Slater mechanism without Brillouin zone-folding. Investigated iridates become insulating due to an opening of a gap at the Fermi level induced by the antiferromagnetic ordering. A negative magnetoresistance was observed for all members of the series. The highest resistivity drop to 8% of the zero-field value was revealed for Dy2Ir2O7. Ferromagnetic Ir domain walls between antiferromagnetic domains were discussed to influence the measured quantities for A2Ir2O7 iridates.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physics and Chemistry of Solids

ISSN

0022-3697

e-ISSN

1879-2553

Svazek periodika

176

Číslo periodika v rámci svazku

květen

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

111268

Kód UT WoS článku

000965670400001

EID výsledku v databázi Scopus

2-s2.0-85147844465