Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in Mn${}_3$P

Abstract

Antiferromagnet Mn${}_3$P with Neel temperature $T_N=30$ K is composed of Mn-tetrahedrons and zigzag chains formed by three inequivalent Mn sites. Due to the nearly frustrated lattice with many short Mn-Mn bonds, competition of the exchange interactions is expected. We here investigate the magnetic structure and physical properties including pressure effect in single crystals of this material, and reveal a complex yet well-ordered helimagnetic structure. The itinerant character of this materials is strong, and the ordered state with small magnetic moments is easily suppressed under pressure, exhibiting a quantum critical point at $\sim 1.6$ GPa. The remarkable mass renormalization, even in the ordered state, and an incoherent-coherent crossover in the low-temperature region, characterize an unusual electronic state in Mn${}_3$P, which is most likely effected by the underlying frustration effect.

10 pages, 12 figures, including the Supplemental Material, to be published in Physical Review Letters

References in corpus (6)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Pressure induced superconductivity on the border of magnetic order in MnP
• Non-collinear spin-density wave antiferromagnetism in FeAs
• Doped Mott insulator as the origin of heavy Fermion behavior in LiV2O4
• Electron Correlation Driven Heavy-Fermion Formation in LiV2O4

Cited by in corpus (3)

• Site Split of Antiferromagnetic $\alpha$-Mn Revealed by ${}^{55}$Mn Nuclear Magnetic Resonance
• Fingerprints for anisotropic Kondo lattice behavior in the quasiparticle dynamics of the kagome metal Ni${}_3$In
• Magnon Damping as a Probe of Kondo Coupling in Magnetically Ordered Systems