Gradual suppression of antiferromagnetism in BaFe_2(As_<1-x>P_x)_2 : Zero-temperature evidence for a quantum critical point
Gradual suppression of antiferromagnetism in BaFe_2(As_<1-x>P_x)_2 : Zero-temperature evidence for a quantum critical point
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BaFe_2(As_<1-x>P_x)_2 中反铁磁性的逐渐抑制：量子临界点的零温度证据
DOI：
10.1103/physrevb.85.184505
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发表时间：
2012
影响因子：
3.7
通讯作者：
et al.,
中科院分区：
文献类型：
--
作者：
T. Iye;et al.,
用p核磁共振技术系统地研究了轻p取代BaFe（AsP）的静态和动态磁性能。从反铁磁（AFM）相核磁共振波谱展宽计算得到的零温度极限P位平均内磁场随增大逐渐抑制，这为AFM量子临界点（QCP）的存在提供了明确的证据。原子力显微镜QCP的位置与先前根据正常状态下自旋动力学的温度依赖所估计的一致，并且超导转变温度在QCP周围最高。我们的实验揭示了QCP延伸到室温的特征，将BaFe（AsP）建立为揭示量子临界性质以及AFM量子临界与非常规超导之间关系的最容易获得的系统之一。
Static and dynamic magnetic properties of lightly P-substituted BaFe(AsP)were systematically investigated byP 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 towardwith increasing, which provides definitive evidence for the existence of an AFM quantum critical point (QCP) at. 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 temperaturetakes the maximum around the QCP. Our experiments, revealing a signature of a QCP extending up to room temperature, establish BaFe(AsP)as one of the most accessible systems for unraveling the nature of quantum criticality and the relationship between AFM quantum criticality and unconventional superconductivity.