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Elastic anomalies in BaFe2-xNixAs2 crystals

Identifieur interne : 000085 ( France/Analysis ); précédent : 000084; suivant : 000086

Elastic anomalies in BaFe2-xNixAs2 crystals

Auteurs : M. Saint-Paul [France] ; A. Abbassi [Maroc] ; Zhao-Sheng Wang [France, République populaire de Chine] ; HUINQIAN LUO [République populaire de Chine] ; XINGYE LU [République populaire de Chine] ; CONG REN [République populaire de Chine] ; Hai-Hu Wen [République populaire de Chine] ; K. Hasselbach [France]

Source :

RBID : Pascal:13-0096621

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English descriptors

Abstract

We present ultrasonic measurements on superconducting BaFe2-xNixAs2 crystals with x=0.07 and x = 0.15. The elastic constants C33 and C44 for the underdoped crystal (x = 0.07) show a large softening related to the structural phase transition at high temperatures. Anomalies in the sound velocity and the ultrasonic attenuation have been found at the superconducting phase transition Tc = 17 K. Ultrasonic attenuation exhibits a peak at the superconducting transition in contrast with the attenuation in conventional superconductors. In the overdoped crystal (x = 0.15) a minimum of C66 is found at a temperature just above the superconducting temperature Tc = 13 K. Superconducting energy gap values have been tentatively extracted from the longitudinal ultrasonic attenuation. Unconventional behaviour of the ultrasonic attenuation is observed in the superconducting BaFe2-xNixAs2 crystals.


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Pascal:13-0096621

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<term>Acoustical wave attenuation</term>
<term>Anomaly</term>
<term>Barium Iron Arsenides Mixed</term>
<term>Doping</term>
<term>Elastic constants</term>
<term>High temperature</term>
<term>Impurity density</term>
<term>Iron based arsenide</term>
<term>Iron based superconductors</term>
<term>Nickel additions</term>
<term>Phase transformations</term>
<term>Pnictides</term>
<term>Sound velocity</term>
<term>Specific heat</term>
<term>Superconducting energy gap</term>
<term>Superconducting transitions</term>
<term>Superconductors</term>
<term>Ultrasonic method</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr">
<term>Anomalie</term>
<term>Méthode ultrasonore</term>
<term>Constante élasticité</term>
<term>Transformation phase</term>
<term>Haute température</term>
<term>Célérité son</term>
<term>Atténuation onde acoustique</term>
<term>Transition supraconductrice</term>
<term>Bande interdite supraconductrice</term>
<term>Chaleur massique</term>
<term>Concentration impureté</term>
<term>Addition nickel</term>
<term>Dopage</term>
<term>Supraconducteur</term>
<term>Pnicture</term>
<term>Baryum Fer Arséniure Mixte</term>
<term>Supraconducteur à base de fer</term>
<term>Arséniure à base de fer</term>
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<div type="abstract" xml:lang="en">We present ultrasonic measurements on superconducting BaFe
<sub>2-x</sub>
Ni
<sub>x</sub>
As
<sub>2</sub>
crystals with x=0.07 and x = 0.15. The elastic constants C
<sub>33</sub>
and C
<sub>44</sub>
for the underdoped crystal (x = 0.07) show a large softening related to the structural phase transition at high temperatures. Anomalies in the sound velocity and the ultrasonic attenuation have been found at the superconducting phase transition T
<sub>c</sub>
= 17 K. Ultrasonic attenuation exhibits a peak at the superconducting transition in contrast with the attenuation in conventional superconductors. In the overdoped crystal (x = 0.15) a minimum of C
<sub>66</sub>
is found at a temperature just above the superconducting temperature T
<sub>c</sub>
= 13 K. Superconducting energy gap values have been tentatively extracted from the longitudinal ultrasonic attenuation. Unconventional behaviour of the ultrasonic attenuation is observed in the superconducting BaFe
<sub>2-x</sub>
Ni
<sub>x</sub>
As
<sub>2</sub>
crystals.</div>
</front>
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<name sortKey="Wen, Hai Hu" sort="Wen, Hai Hu" uniqKey="Wen H" first="Hai-Hu" last="Wen">Hai-Hu Wen</name>
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