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Phase Separation of Antiferromagnetism and Superconductivity in RbxFe2−ySe2 Observed by Using Rb NMR
Yoshiaki Kobayashi,Shunsuke Saiki,Shouhei Kototani,Masayuki Itoh,Masatoshi Sato 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have carried out 87Rb NMR measurements on single crystals with and without the superconducting(SC) transition to clarify whether the SC and the antiferromagnetic (AFM) states aremicroscopically coexistent or just phase-separated in the Rb-intercalated iron-selenide RbxFe2−ySe2. The 87Rb NMR spectra observed at temperature below 300 K for these crystals are clearly separableinto two parts with different structures and widths. The broader spectrum can be explainedby the presence of a region with an AFM spin structure proposed by neutron scattering studies. The narrower spectrum in the crystal with the SC transition can be understood from the temperaturedependences of the spectral frequency-position and shape to stem from the SC region withTc = 30.8 K. Thus, we can clearly conclude that the superconductivity and the antiferromagnetismin the present system are phase-separated. Also, the crystal without the SC transition has twophase-separated regions with respective magnetic transitions at 500 and 50 K.
Magnetism and Superconductivity in RbxFe2−ySe2
Kazuki Ohishi,Masatoshi Sato,Shouhei Kototani,Shunsuke Saiki,Yoshiaki Kobayashi,Masayuki Itoh 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed zero-field muon spin relaxation measurements in single-crystalline samplesof superconducting (SC) RbxFe2−ySe2 (Tc = 29 K) and non-SC RbxFe2−ySe2 in order to elucidatewhether there is difference in the magnetic states between SC and non-SC systems. In the SCsample, no temperature dependence of the muon spin polarization was observed at temperaturesbelow 40 K while a decrease in the spin polarization was observed in the non-SC sample withdecreasing temperature. This suggests that a new magnetically ordered state seems to develop inthe non-SC sample.