2012年5月
Gradual suppression of antiferromagnetism in BaFe2(As1-xPx)(2): Zero-temperature evidence for a quantum critical point
PHYSICAL REVIEW B
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- 巻
- 85
- 号
- 18
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.85.184505
- 出版者・発行元
- AMER PHYSICAL SOC
Static and dynamic magnetic properties of lightly P-substituted BaFe2(As1-xPx)(2) were systematically investigated by P-31 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 similar to 0.35 with increasing x, which provides definitive evidence for the existence of an AFM quantum critical point (QCP) at x similar to 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 BaFe2(As1-xPx)(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.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.85.184505
- ISSN : 1098-0121
- Web of Science ID : WOS:000303653600004