TY - JOUR
T1 - Universal relationship between low-energy antiferromagnetic fluctuations and superconductivity in BaFe2(As1-x Px)2
AU - Kitagawa, Shunsaku
AU - Kawamura, Takeshi
AU - Ishida, Kenji
AU - Mizukami, Yuta
AU - Kasahara, Shigeru
AU - Shibauchi, Takasada
AU - Terashima, Takahito
AU - Matsuda, Yuji
N1 - Funding Information:
The authors acknowledge S. Yonezawa, Y. Maeno, and H. Ikeda for fruitful discussions. This work was partially supported by the Kyoto University LTM Center and Grant-in-Aids for Scientific Research (KAKENHI) (Grants No. JP15H05882, No. JP15H05884, No. JP15K21732, No. JP15H05745, No. JP17K14339, No. JP19K14657, No. JP19H04696, and No. JP19H05824).
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/8/12
Y1 - 2019/8/12
N2 - To identify the key parameter for optimal superconductivity in iron pnictides, we measured the P31-NMR relaxation rate on BaFe2(As1-xPx)2(x=0.22 and 0.28) under pressure and compared the effects of chemical substitution and physical pressure. For x=0.22, structural and antiferromagnetic (AFM) transition temperatures both show minimal changes with pressure up to 2.4 GPa, whereas the superconducting transition temperature Tc increases to twice its former value. In contrast, for x=0.28 near the AFM quantum critical point (QCP), the structural phase transition is quickly suppressed by pressure and Tc reaches a maximum. The analysis of the temperature-dependent nuclear relaxation rate indicates that these contrasting behaviors can be quantitatively explained by a single curve of the Tc dome as a function of Weiss temperature θ, which measures the distance to the QCP. Moreover, the Tc-θ curve under pressure precisely coincides with that with a chemical substitution, which is indicative of the existence of a universal relationship between low-energy AFM fluctuations and superconductivity on BaFe2(As1-xPx)2.
AB - To identify the key parameter for optimal superconductivity in iron pnictides, we measured the P31-NMR relaxation rate on BaFe2(As1-xPx)2(x=0.22 and 0.28) under pressure and compared the effects of chemical substitution and physical pressure. For x=0.22, structural and antiferromagnetic (AFM) transition temperatures both show minimal changes with pressure up to 2.4 GPa, whereas the superconducting transition temperature Tc increases to twice its former value. In contrast, for x=0.28 near the AFM quantum critical point (QCP), the structural phase transition is quickly suppressed by pressure and Tc reaches a maximum. The analysis of the temperature-dependent nuclear relaxation rate indicates that these contrasting behaviors can be quantitatively explained by a single curve of the Tc dome as a function of Weiss temperature θ, which measures the distance to the QCP. Moreover, the Tc-θ curve under pressure precisely coincides with that with a chemical substitution, which is indicative of the existence of a universal relationship between low-energy AFM fluctuations and superconductivity on BaFe2(As1-xPx)2.
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U2 - 10.1103/PhysRevB.100.060503
DO - 10.1103/PhysRevB.100.060503
M3 - Article
AN - SCOPUS:85070603653
SN - 2469-9950
VL - 100
JO - Physical Review B
JF - Physical Review B
IS - 6
M1 - 060503
ER -