Magnetic and superconducting properties of FeSe1–xTex (x 0, 0.5, and 1.0)

Сверхпроводимость

Автор(и)

  • A.V. Fedorchenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • O.S. Volkova Moscow State University, Physics Department, Moscow 119991, Russia
  • D.A. Chareev Institute of Experimental Mineralogy, Russian Academy of Sciences Chernogolovka, Moscow District 142432, Russia
  • A. Loidl Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics University of Augsburg, Augsburg 86159, Germany
  • H.-A. Krug von Nidda Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics University of Augsburg, Augsburg 86159, Germany
  • J. Deisenhofer Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics University of Augsburg, Augsburg 86159, Germany
  • V.V. Tsurkan Experimental Physics 5, Center for Electronic Correlations and Magnetism, Institute of Physics University of Augsburg, Augsburg 86159, Germany
  • S.L. Gnatchenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • A.S. Panfilov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • V.A. Desnenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • G.E. Grechnev B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • A.N. Vasiliev Moscow State University, Physics Department, Moscow 119991, Russia

DOI:

https://doi.org/10.1063/1.3552132

Ключові слова:

FeSe, FeTe, high-temperature superconductivity, magnetization, electronic structure.

Анотація

Magnetization studies for FeSe1–xTex (x ≃ 0, 0.5, and 1.0) compounds were carried out in magnetic fields up to 50 kOe and in the temperature range 2–300 K. The superconducting transition was observed at Tc ≃ 8 K and 13.6–14.2 K in FeSe0.963 and FeSe0.5Te0.5, respectively. For the most samples, a nonlinear behavior of the magnetization curves in the normal state gives evidence of a commonly observed substantial presence of ferromagnetic impurities in the compounds under study. By taking these impurity effects into account, the intrinsic magnetic susceptibility χ of FeSe0.963, FeSe0.5Te0.5, and FeTe was estimated to increase gradually with Te content. For FeTe a drastic drop in χ(T) with decreasing temperature was found at TN ≃ 70 K, which is presumably related to antiferromagnetic ordering. To shed light on the observed magnetic properties, ab initio calculations of the exchange enhanced magnetic susceptibility are performed for FeSe and FeTe within the local spin density approximation.

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Опубліковано

2010-11-19

Як цитувати

(1)
Fedorchenko, A.; Volkova, O.; Chareev, D.; Loidl, A.; Nidda, H.-A. K. von; Deisenhofer, J.; Tsurkan, V.; Gnatchenko, S.; Panfilov, A.; Desnenko, V.; Grechnev, G.; Vasiliev, A. Magnetic and Superconducting Properties of FeSe1–xTex (x 0, 0.5, and 1.0): Сверхпроводимость. Fiz. Nizk. Temp. 2010, 37, 100-107.

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