Avoided ferromagnetic quantum critical point in CeRuPO

Abstract

CeRuPO is a rare example of a ferromagnetic (FM) Kondo-lattice system. External pressure suppresses the ordering temperature to zero at about $p_c\approx 3$ GPa. Our ac-susceptibility and electrical-resistivity investigations evidence that the type of magnetic ordering changes from FM to antiferromagnetic (AFM) at about $p^{\ast }\approx 0.87$ GPa. Studies in applied magnetic fields suggest that ferromagnetic and antiferromagnetic correlations compete for the ground state at $p>p^{\ast }$, but finally the AFM correlations win. The change in the magnetic ground-state properties is closely related to the pressure evolution of the crystalline-electric-field level (CEF) scheme and the magnetic Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction. The Néel temperature disappears abruptly in a first-order-like fashion at $p_c$, hinting at the absence of a quantum critical point. This is consistent with the low-temperature transport properties exhibiting Landau-Fermi-liquid (LFL) behavior in the whole investigated pressure range up to 7.5 GPa.

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References in corpus (7)

• CeRuPO: A rare example of a Ferromagnetic Kondo lattice
• Single crystal growth and anisotropy of CeRuPO
• Ferromagnetism and superconductivity in P-doped CeFeAsO
• Ferromagnetic Quantum Critical Point in Heavy-Fermion Iron Oxypnictide Ce(Ru${}_{1-x}$Fe${}_x$)PO
• Ferromagnetic Quantum Critical Point Induced by Tuning the Magnetic Dimensionality of the Heavy-Fermion Iron Oxypnictide Ce(Ru${}_{1-x}$Fe${}_x$)PO
• Hydrostatic and chemical pressure tuning of CeFeAs_1-xP_xO single crystals
• Phase diagram of CeRuPO under pressure investigated by ${}^{31}$P-NMR - Comparison between CeRuPO under pressure and the Ce(Ru${}_{1-x}$Fe${}_x$)PO system -

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