TY - JOUR
T1 - Gradual suppression of antiferromagnetism in BaFe 2(As 1-xP x) 2
T2 - Zero-temperature evidence for a quantum critical point
AU - Iye, Tetsuya
AU - Nakai, Yusuke
AU - Kitagawa, Shunsaku
AU - Ishida, Kenji
AU - Kasahara, Shigeru
AU - Shibauchi, Takasada
AU - Matsuda, Yuji
AU - Terashima, Takahito
PY - 2012/5/4
Y1 - 2012/5/4
N2 - Static and dynamic magnetic properties of lightly P-substituted BaFe 2(As 1-xP x) 2 were systematically investigated by 31P NMR. The averaged internal magnetic field at the P site in the zero-temperature limit evaluated from the broadening of NMR spectra in the antiferromagnetic (AFM) phase is gradually suppressed toward x∼0.35 with increasing x, which provides definitive evidence for the existence of an AFM quantum critical point (QCP) at x∼0.35. The location of the AFM QCP is consistent with the previous estimation from temperature dependence of spin dynamics in the normal state, and the superconducting transition temperature T c takes the maximum around the QCP. Our experiments, revealing a signature of a QCP extending up to room temperature, establish BaFe 2(As 1-xP x) 2 as one of the most accessible systems for unraveling the nature of quantum criticality and the relationship between AFM quantum criticality and unconventional superconductivity.
AB - Static and dynamic magnetic properties of lightly P-substituted BaFe 2(As 1-xP x) 2 were systematically investigated by 31P NMR. The averaged internal magnetic field at the P site in the zero-temperature limit evaluated from the broadening of NMR spectra in the antiferromagnetic (AFM) phase is gradually suppressed toward x∼0.35 with increasing x, which provides definitive evidence for the existence of an AFM quantum critical point (QCP) at x∼0.35. The location of the AFM QCP is consistent with the previous estimation from temperature dependence of spin dynamics in the normal state, and the superconducting transition temperature T c takes the maximum around the QCP. Our experiments, revealing a signature of a QCP extending up to room temperature, establish BaFe 2(As 1-xP x) 2 as one of the most accessible systems for unraveling the nature of quantum criticality and the relationship between AFM quantum criticality and unconventional superconductivity.
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U2 - 10.1103/PhysRevB.85.184505
DO - 10.1103/PhysRevB.85.184505
M3 - Article
AN - SCOPUS:84861154982
SN - 1098-0121
VL - 85
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 18
M1 - 184505
ER -