Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 78, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.78.074718
Keywords
iron-based superconductor; crystal structure analysis; neutron powder diffraction
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Funding
- Ministry of Education, Culture, Sports, Science and Technology [19340090, 17001001]
- Scientific Research on Priority Areas [16076204]
- Grants-in-Aid for Scientific Research [16076204, 19340090] Funding Source: KAKEN
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We determined the crystal structural parameters of FeSe1-xTex (x = 0.5, 0.625, 0.75, 0.875) and FeSe by using the neutron powder diffraction technique. It was found that the superconducting transition temperature T-c of FeSe1-xTex increased with the (Se,Te)-Fe-(Se,Te) bond angle alpha in the Te-doped samples. However, T-c of FeSe did not exhibit a similar relation. In order to explain this contradiction, we studied the temperature dependence of the z position of chalcogens, which is strongly coupled to the spin fluctuation by theoretical calculations. The z position in FeSe showed a remarkable shift, indicating that strong spin fluctuation can affect the superconductivity in FeSe.
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