Doping dependence of the pressure response of Tc in the SmO 1-xFxFeAs superconductors

Yasuhiro Takabayashi; Martin T. McDonald; Dionisis Papanikolaou; Serena Margadonna; G. Wu; R. H. Liu; X. H. Chen; Kosmas Prassides

doi:10.1021/ja8036838

Doping dependence of the pressure response of T_c in the SmO _1-xF_xFeAs superconductors

Yasuhiro Takabayashi, Martin T. McDonald, Dionisis Papanikolaou, Serena Margadonna, G. Wu, R. H. Liu, X. H. Chen, Kosmas Prassides

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

The superconducting transition temperature of the high-T_c SmO_1-xF_xFeAs superconductors increases monotonically as the F-doping level x increases to 0.20. High-pressure magnetization experiments reveal a strong sensitivity of T_c to interatomic distances in the underdoped regime (x ≤ 0.12) with the pressure coefficient of T_c, d(lnT_c)/dP being strongly positive. However, as the doping level increases further to x = 0.15, we find that this sensitivity is strongly suppressed and at the same time, d(lnT_c)/dP sharply switches over to assume negative values with T_c decreasing with increasing applied pressure. The abrupt change in the pressure response of the superconducting properties of the SmO_1-xF_xFeAs phases coincides with the putative existence of a quantum critical point (QCP) near x ≈ 0.14, as proposed by resistivity and Hall effect measurements.

Original language	English
Pages (from-to)	9242-9243
Number of pages	2
Journal	Journal of the American Chemical Society
Volume	130
Issue number	29
DOIs	https://doi.org/10.1021/ja8036838
Publication status	Published - 2008 Jul 23
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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title = "Doping dependence of the pressure response of Tc in the SmO 1-xFxFeAs superconductors",

abstract = "The superconducting transition temperature of the high-Tc SmO1-xFxFeAs superconductors increases monotonically as the F-doping level x increases to 0.20. High-pressure magnetization experiments reveal a strong sensitivity of Tc to interatomic distances in the underdoped regime (x ≤ 0.12) with the pressure coefficient of Tc, d(lnTc)/dP being strongly positive. However, as the doping level increases further to x = 0.15, we find that this sensitivity is strongly suppressed and at the same time, d(lnTc)/dP sharply switches over to assume negative values with Tc decreasing with increasing applied pressure. The abrupt change in the pressure response of the superconducting properties of the SmO1-xFxFeAs phases coincides with the putative existence of a quantum critical point (QCP) near x ≈ 0.14, as proposed by resistivity and Hall effect measurements.",

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T1 - Doping dependence of the pressure response of Tc in the SmO 1-xFxFeAs superconductors

AU - Takabayashi, Yasuhiro

AU - McDonald, Martin T.

AU - Papanikolaou, Dionisis

AU - Margadonna, Serena

AU - Wu, G.

AU - Liu, R. H.

AU - Chen, X. H.

AU - Prassides, Kosmas

PY - 2008/7/23

Y1 - 2008/7/23

N2 - The superconducting transition temperature of the high-Tc SmO1-xFxFeAs superconductors increases monotonically as the F-doping level x increases to 0.20. High-pressure magnetization experiments reveal a strong sensitivity of Tc to interatomic distances in the underdoped regime (x ≤ 0.12) with the pressure coefficient of Tc, d(lnTc)/dP being strongly positive. However, as the doping level increases further to x = 0.15, we find that this sensitivity is strongly suppressed and at the same time, d(lnTc)/dP sharply switches over to assume negative values with Tc decreasing with increasing applied pressure. The abrupt change in the pressure response of the superconducting properties of the SmO1-xFxFeAs phases coincides with the putative existence of a quantum critical point (QCP) near x ≈ 0.14, as proposed by resistivity and Hall effect measurements.

AB - The superconducting transition temperature of the high-Tc SmO1-xFxFeAs superconductors increases monotonically as the F-doping level x increases to 0.20. High-pressure magnetization experiments reveal a strong sensitivity of Tc to interatomic distances in the underdoped regime (x ≤ 0.12) with the pressure coefficient of Tc, d(lnTc)/dP being strongly positive. However, as the doping level increases further to x = 0.15, we find that this sensitivity is strongly suppressed and at the same time, d(lnTc)/dP sharply switches over to assume negative values with Tc decreasing with increasing applied pressure. The abrupt change in the pressure response of the superconducting properties of the SmO1-xFxFeAs phases coincides with the putative existence of a quantum critical point (QCP) near x ≈ 0.14, as proposed by resistivity and Hall effect measurements.

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Doping dependence of the pressure response of T_c in the SmO _1-xF_xFeAs superconductors

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