2018
DOI: 10.1103/physrevb.97.094505
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Pressure dependence of superconductivity in low- and high- Tc phases of (NH3)yNax

Abstract: We prepared two superconducting phases, which are called "low-T c phase" and "high-T c phase" of (NH 3) y Na x FeSe showing T c 's of 35 and 44 K, respectively, at ambient pressure, and studied the superconducting behavior and structure of each phase under pressure. The T c of the 35 K at ambient pressure rapidly decreases with increasing pressure up to 10 GPa, and it remains unchanged up to 22 GPa. Finally, superconductivity was not observed down to 1.4 K at 29 GPa, i.e., T c < 1.4 K. The T c of the 44 K phas… Show more

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Cited by 10 publications
(22 citation statements)
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“…Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. further increased separation of FeSe layers suppressed the value of T c , as reported previously [14][15][16][17][18]. Moreover, a discontinuous change of T c at c=14 Å was found in the T c -c phase diagram of metal-doped FeSe [14].…”
Section: Introductionsupporting
confidence: 83%
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“…Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. further increased separation of FeSe layers suppressed the value of T c , as reported previously [14][15][16][17][18]. Moreover, a discontinuous change of T c at c=14 Å was found in the T c -c phase diagram of metal-doped FeSe [14].…”
Section: Introductionsupporting
confidence: 83%
“…The [17,18,20] is similar to that of metal-doped FeSe [14], i.e. the sudden variation of the T c -c plot at a c of 16.8 Å, and the suppression of T c by the further elongation of c above 18.2 Å are found.…”
Section: Resultssupporting
confidence: 63%
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