In:
Chinese Physics Letters, IOP Publishing, Vol. 37, No. 8 ( 2020-08-01), p. 087106-
Abstract:
Recently, a series of novel compounds Ba 3 MX 5 (M = Fe, Ti, V; X = Se, Te) with hexagonal crystal structures composed of quasi-1-dimensional (1D) magnetic chains has been synthesized by our research team using high-pressure and high-temperature methods. The initial hexagonal phases persist to the maximum achievable pressure, while spin configurations and magnetic interactions may change dramatically as a result of considerable reductions in interchain separations upon pressurization. These compounds therefore offer unique possibilities for studying the evolution of intrinsic electronic structures in quasi-1D magnetic systems. Here we present a systematic investigation of Ba 9 Fe 3 Te 15 , in which the interchain separations between trimerized 1D chains (∼ 10.2 Å) can be effectively modulated by external high pressure. The crystal structure especially along the 1D chains exhibits an abnormal expansion at ∼5 GPa, which accompanies trimerization entangled anomalous mixed-high-low spin transition. An insulator-metal transition has been observed under high pressure as a result of charge-transfer gap closing. Pressure-induced superconductivity emerges at 26 GPa, where the charge-transfer gap fully closes, 3D electronic configuration forms and local spin fully collapses.
Type of Medium:
Online Resource
ISSN:
0256-307X
,
1741-3540
DOI:
10.1088/0256-307X/37/8/087106
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2020
detail.hit.zdb_id:
2040565-0
SSG:
6,25
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