Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F12%3A10126105" target="_blank" >RIV/00216208:11320/12:10126105 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1143/JPSJ.81.104715" target="_blank" >http://dx.doi.org/10.1143/JPSJ.81.104715</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1143/JPSJ.81.104715" target="_blank" >10.1143/JPSJ.81.104715</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs

Popis výsledku v původním jazyce

We report on the existence of superconductivity in YIr2Si2 and LaIr2Si2 compounds in relation to the crystal structure. The two compounds crystallize in two structural polymorphs, both tetragonal. The high-temperature polymorph (HTP) is of the CaBe2Ge2 structure type (space group P4/nmm), while the low-temperature polymorph (LTP) is of the ThCr2Si2 structure type (I4/mmm). By studying the polycrystals prepared by arc melting, we observed that the rapidly cooled samples retain the HTP even at room temperature (RT) and below. Annealing such samples at }= 900 degrees C followed by slow cooling to RT provides the LTP. Both the HTP and LTP were subsequently studied with respect to magnetism and superconductivity by electrical resistivity, magnetization, ACsusceptibility, and specific heat measurements. The HTP and LTP of both compounds behave as Pauli paramagnets. Superconductivity was found exclusively in the HTP of both compounds below T-SC (= 2.52 K in YIr2Si2 and 1.24 K in LaIr2Si2). T

Název v anglickém jazyce

Superconductivity in the YIr2Si2 and LaIr2Si2 Polymorphs

Popis výsledku anglicky

We report on the existence of superconductivity in YIr2Si2 and LaIr2Si2 compounds in relation to the crystal structure. The two compounds crystallize in two structural polymorphs, both tetragonal. The high-temperature polymorph (HTP) is of the CaBe2Ge2 structure type (space group P4/nmm), while the low-temperature polymorph (LTP) is of the ThCr2Si2 structure type (I4/mmm). By studying the polycrystals prepared by arc melting, we observed that the rapidly cooled samples retain the HTP even at room temperature (RT) and below. Annealing such samples at }= 900 degrees C followed by slow cooling to RT provides the LTP. Both the HTP and LTP were subsequently studied with respect to magnetism and superconductivity by electrical resistivity, magnetization, ACsusceptibility, and specific heat measurements. The HTP and LTP of both compounds behave as Pauli paramagnets. Superconductivity was found exclusively in the HTP of both compounds below T-SC (= 2.52 K in YIr2Si2 and 1.24 K in LaIr2Si2). T

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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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)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Journal of the Physical Society of Japan

ISSN

0031-9015

e-ISSN

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Svazek periodika

81

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

JP - Japonsko

Počet stran výsledku

9

Strana od-do

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Kód UT WoS článku

000309342700040

EID výsledku v databázi Scopus

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