Emergence of multiple superconducting phases in (NH 3)yMxFeSe (M: Na and Li)

Lu Zheng, Xiao Miao, Yusuke Sakai, Masanari Izumi, Hidenori Goto, Saki Nishiyama, Eri Uesugi, Yuichi Kasahara, Yoshihiro Iwasa, Yoshihiro Kubozono

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Abstract

We previously discovered multiple superconducting phases in the ammoniated Na-doped FeSe material, (NH 3)yNaxFeSe . To clarify the origin of the multiple superconducting phases, the variation of T c was fully investigated as a function of x in (NH 3)yNaxFeSe . The 32 K superconducting phase is mainly produced in the low-x region below 0.4, while only a single phase is observed at x = 1.1, with T c = 45K, showing that the T c depends significantly on x, but it changes discontinuously with x. The crystal structure of (NH 3)yNaxFeSe does not change as x increases up to 1.1, i.e., the space group of I4/mmm. The lattice constants, a and c, of the low-T c phase (T c =32.5K) are 3.9120(9) and 14.145(8)Å, respectively, while a=3.8266(7)Å and c=17.565(9)Å for the high-T c phase (∼46K). The c increases in the high T c phase, implying that the T c is directly related to c. In (NH 3) y Li x FeSe material, the T c varies continuously within the range of 39 to 44K with changing x. Thus, the behavior of T c is different from that of (NH 3)yNaxFeSe . The difference may be due to the difference in the sites that the Na and Li occupy.

Original languageEnglish
Article number12774
JournalScientific Reports
Volume5
DOIs
Publication statusPublished - Aug 4 2015

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Emergence of multiple superconducting phases in (NH 3)yMxFeSe (M : Na and Li). / Zheng, Lu; Miao, Xiao; Sakai, Yusuke; Izumi, Masanari; Goto, Hidenori; Nishiyama, Saki; Uesugi, Eri; Kasahara, Yuichi; Iwasa, Yoshihiro; Kubozono, Yoshihiro.

In: Scientific Reports, Vol. 5, 12774, 04.08.2015.

Research output: Contribution to journalArticle

Zheng, L, Miao, X, Sakai, Y, Izumi, M, Goto, H, Nishiyama, S, Uesugi, E, Kasahara, Y, Iwasa, Y & Kubozono, Y 2015, 'Emergence of multiple superconducting phases in (NH 3)yMxFeSe (M: Na and Li)', Scientific Reports, vol. 5, 12774. https://doi.org/10.1038/srep12774
Zheng, Lu ; Miao, Xiao ; Sakai, Yusuke ; Izumi, Masanari ; Goto, Hidenori ; Nishiyama, Saki ; Uesugi, Eri ; Kasahara, Yuichi ; Iwasa, Yoshihiro ; Kubozono, Yoshihiro. / Emergence of multiple superconducting phases in (NH 3)yMxFeSe (M : Na and Li). In: Scientific Reports. 2015 ; Vol. 5.
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abstract = "We previously discovered multiple superconducting phases in the ammoniated Na-doped FeSe material, (NH 3)yNaxFeSe . To clarify the origin of the multiple superconducting phases, the variation of T c was fully investigated as a function of x in (NH 3)yNaxFeSe . The 32 K superconducting phase is mainly produced in the low-x region below 0.4, while only a single phase is observed at x = 1.1, with T c = 45K, showing that the T c depends significantly on x, but it changes discontinuously with x. The crystal structure of (NH 3)yNaxFeSe does not change as x increases up to 1.1, i.e., the space group of I4/mmm. The lattice constants, a and c, of the low-T c phase (T c =32.5K) are 3.9120(9) and 14.145(8){\AA}, respectively, while a=3.8266(7){\AA} and c=17.565(9){\AA} for the high-T c phase (∼46K). The c increases in the high T c phase, implying that the T c is directly related to c. In (NH 3) y Li x FeSe material, the T c varies continuously within the range of 39 to 44K with changing x. Thus, the behavior of T c is different from that of (NH 3)yNaxFeSe . The difference may be due to the difference in the sites that the Na and Li occupy.",
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