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Magnetyzm i nadprzewodnictwo w EuFe 2-x Co x As 2

Magnetyzm i nadprzewodnictwo w EuFe 2-x Co x As 2 – badania metodą spektroskopii mössbauerowskiej 57 Fe i 151 Eu A. Błachowski 1 , K. Ruebenbauer 1 , J. Żukrowski 2 , Z . Bukowski 3 , K. Rogacki 3 , P.J.W. Moll 4 , J. Karpinski 4 , M. Matusiak 3

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Magnetyzm i nadprzewodnictwo w EuFe 2-x Co x As 2

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  1. Magnetyzm i nadprzewodnictwo w EuFe2-xCoxAs2 – badania metodą spektroskopii mössbauerowskiej 57Fe i 151Eu A. Błachowski1, K. Ruebenbauer1, J. Żukrowski2, Z. Bukowski3, K. Rogacki3, P.J.W. Moll4, J. Karpinski4, M. Matusiak3 1Laboratorium Spektroskopii Mössbauerowskiej, Uniwersytet Pedagogiczny, Kraków, Polska 2Katedra Fizyki Ciała Stałego, Wydział Fizyki i Informatyki Stosowanej, Akademia Górniczo-Hutnicza, Kraków, Polska 3Instytut Niskich Temperatur i Badań Strukturalnych PAN, Wrocław, Polska 4Laboratory for Solid State Physics, ETH Zurich, Switzerland --------------------------------------------------------------------------------------------------------------------------------------------------------------- IX Ogólnopolskie Seminarium Spektroskopii Mössbauerowskiej OSSM’2012, Lublin - Kazimierz Dolny, 10-13 czerwca 2012

  2. Fe-based Superconducting Families pnictogens:P, As, Sb chalcogens:S, Se, Te 1111 12211111 LnFeAsO(F)AFe2As2LiFeAs FeTe(Se,S) Ln = La, Ce, Pr, Nd, Sm, Gd … A = Ca, Sr, Ba, Eu Tcmax = 56 K 38 K 18 K 15 K

  3. Layered Structure of Fe-based Superconductors --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Phase Diagram Ba1-xKxFe2As2 BaFe2-xCoxAs2 BaFe2As2-xPx Parent Compounds Doped Compounds ↓ Superconductors

  4. ”122” family of Fe-based superconductors

  5. 57Fe Mössbauer spectra CaFe2As2 TSDW = 175 K CaFe1.92Co0.08As2 Tsc = 20 K Relative resistivity (normalized to the resistivity at 300 K) versus temperature A.Błachowski, K.Ruebenbauer, J.Żukrowski, Z.Bukowski, M.Matusiak, J.Karpinski, Acta Physica Polonica A 121, 726 (2012)

  6. 57Fe Mössbauer spectra BaFe2As2 TSDW = 136 K Ba0.7Rb0.3Fe2As2 Tsc = 37 K NM non-magnetic

  7. Shape of SDW for various temperatures Square root from the mean squared amplitude of SDW versus temperature

  8. EuFe2As2 Square root from the mean squared amplitude of SDW versus temperature TSDW = 192 K 0 = 0.124 A.Błachowski, K.Ruebenbauer, J.Żukrowski, K.Rogacki, Z.Bukowski, J.Karpinski, Phys. Rev. B 83, 134410 (2011)

  9. EuFe2-xCoxAs2 TN (Eu) = 19 K A.Błachowski, K.Ruebenbauer, J.Żukrowski, Z.Bukowski, K.Rogacki, P.J.W.Moll, J.Karpinski, Phys. Rev. B 84, 174503 (2011)

  10. EuFe2-xCoxAs2 57Fe Mössbauer spectra TN (Eu) = 19 K TSDW = 190 K TSDW = 150 K TSDW = 100 K traces of SDW at 80 K lack of SDW Eu2+ Transferred Field on 57Fe

  11. EuFe2-xCoxAs2 57Fe Mössbauer spectra Shape ofSDW

  12. EuFe1.66Co0.34As2 Square root from the mean squared amplitude of SDW versus temperature EuFe2-xCoxAs2

  13. 151Eu Mössbauer spectroscopy

  14. EuFe2-xCoxAs2 151Eu Mössbauer spectra

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