Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F14%3A33151453" target="_blank" >RIV/61989592:15310/14:33151453 - isvavai.cz</a>

Výsledek na webu

<a href="http://download.springer.com/static/pdf/153/art%253A10.1007%252Fs10948-014-2531-2.pdf?auth66=1424432410_136ce4471f302dd10c5d4a042538352c&ext=.pdf" target="_blank" >http://download.springer.com/static/pdf/153/art%253A10.1007%252Fs10948-014-2531-2.pdf?auth66=1424432410_136ce4471f302dd10c5d4a042538352c&ext=.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10948-014-2531-2" target="_blank" >10.1007/s10948-014-2531-2</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect

Popis výsledku v původním jazyce

We report the results of investigation of hightemperature superconductor (HTSC) LaFeO(1?x)FxAs at x = 0.15. We applied the XRD method, the measurement of the hysteresis curve and resistivity, as well as the Mössbauer measurements at the temperature range4.2-300K.We show that in the given sample, owing to doping by fluorine, full suppression of antiferromagnetism is not accompanied by the rise of superconductivity. Instead, we observe a high-temperature (at T ? 40 K) Kondo effect, which indicates a strong coupling of electron's spins with the magnetic moments of impurities. We also find a correlation between the revealed high-temperature Kondo effect and the appearance of a quadrupole splitting in the Mössbauer spectra below 40 K. The revealed effectscan shed light on the mechanism of superconductivity in the iron-containing HTSC.

Název v anglickém jazyce

Mössbauer investigation of superconductors LaFeO0.85F0.15As and high-temperature Kondo effect

Popis výsledku anglicky

We report the results of investigation of hightemperature superconductor (HTSC) LaFeO(1?x)FxAs at x = 0.15. We applied the XRD method, the measurement of the hysteresis curve and resistivity, as well as the Mössbauer measurements at the temperature range4.2-300K.We show that in the given sample, owing to doping by fluorine, full suppression of antiferromagnetism is not accompanied by the rise of superconductivity. Instead, we observe a high-temperature (at T ? 40 K) Kondo effect, which indicates a strong coupling of electron's spins with the magnetic moments of impurities. We also find a correlation between the revealed high-temperature Kondo effect and the appearance of a quadrupole splitting in the Mössbauer spectra below 40 K. The revealed effectscan shed light on the mechanism of superconductivity in the iron-containing HTSC.

Druh

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

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Journal of Superconductivity and Novel Magnetism

ISSN

1557-1939

e-ISSN

—

Svazek periodika

27

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

1825-1829

Kód UT WoS článku

000339882200006

EID výsledku v databázi Scopus

—