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Article overview
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Evidence for two distinct superconducting phases in EuBiS$_2$F under pressure | | C. Y. Guo
; Y. Chen
; M. Smidman
; S. A. Chen
; W. B. Jiang
; H. F. Zhai
; Y. F. Wang
; G. H. Cao
; J. M. Chen
; X. Lu
; H. Q. Yuan
; | | Date: |
18 May 2015 | | Abstract: | We present a pressure study of the electrical resistivity, AC magnetic
susceptibility and powder x-ray diffraction (XRD) of the newly discovered
BiS$_2$-based superconductor EuBiS$_2$F. At ambient pressure, EuBiS$_2$F shows
an anomaly in the resistivity at around $T_0approx~280$ K and a
superconducting transition at $T_capprox~0.3$ K. Upon applying hydrostatic
pressure, there is little change in $T_0$ but the amplitude of the resistive
anomaly is suppressed, whereas there is a dramatic enhancement of $T_c$ from
0.3~K to about 8.6~K at a critical pressure of $p_c$ $approx{1.4}$~GPa. XRD
measurements confirm that this enhancement of $T_c$ coincides with a structural
phase transition from a tetragonal phase ($P4/nmm$) to a monoclinic phase
($P2_1$/m), which is similar to that observed in isostructural
LaO$_{0.5}$F$_{0.5}$BiS$_2$. Our results suggest the presence of two different
superconducting phases with distinct crystal structures in EuBiS$_2$F, which
may be a general property of this family of BiS$_2$-based superconductors. | | Source: | arXiv, 1505.4704 | | Services: | Forum | Review | PDF | Favorites | |
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