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A New form of magnetic correlation in Co-doped YbRh$$_2$$Si$$_2$$

Coドープ系YbRh$$_2$$Si$$_2$$における新たな磁気相関

金子 耕士   ; Stockert, O.*; 田端 千紘; 桑原 慶太郎*; 鬼柳 亮嗣  ; 中尾 朗子*; Krellner, C.*; Geibel, C.*

Kaneko, Koji; Stockert, O.*; Tabata, Chihiro; Kuwahara, Keitaro*; Kiyanagi, Ryoji; Nakao, Akiko*; Krellner, C.*; Geibel, C.*

Novel physical phenomena, such as superconductivity and non-Fermi liquid behavior, emerge in the vicinity of a quantum critical point (QCP). YbRh$$_2$$Si$$_2$$ has been extensively studied owing to its proximity to an antiferromagnetic (AFM) QCP at ambient pressure. The AFM order at $$T_N$$= 70 mK is suppressed by a weak external magnetic field. An inelastic neutron scattering study revealed a competition between ferromagnetic and incommensurate spin fluctuations at q' close to the zone center in YbRh$$_2$$Si$$_2$$, and evolution of resonance-like response at q=0 under magnetic fields. These features suggest an importance of ferromagnetic fluctuations in this system, where as a static AFM order was not confirmed at q'. This fact indicates that the AFM order in YbRh$$_2$$Si$$_2$$ may have a different characteristic wave vector. As the latest study discovers emergence of superconductivity at very low temperature, recurring interests on nature of the AFM order burst. A search for an AFM Bragg reflection in YbRh$$_2$$Si$$_2$$ has extreme difficulties arising from extremely low $$T_N$$, and correspondingly a tiny ordered moment. To overcome these difficulties, we focus on isoelectronic substitution, where substitution of Rh with Co leads to a stabilization of the magnetic order. The huge enhancement of $$T_N$$ through the Co doping provides us with an opportunity to study the magnetic order closely. Our latest single crystal neutron scattering experiment was carried out on a lower Co concentration of 0.18. A new form of the AFM ordering vector was revealed in the ground state. This provides new insights into magnetic properties of YbRh$$_2$$Si$$_2$$.

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