Novel Itinerant Antiferromagnet TiAu

Abstract

Itinerant and local moment magnetism have substantively different origins, and require distinct theoretical treatment. A unified theory of magnetism has long been sought after, and remains elusive, mainly due to the limited number of known itinerant magnetic systems. In the case of the two such examples discovered several decades ago, the itinerant ferromagnets ZrZn_2 and Sc_3In, the understanding of their magnetic ground states draws on the existence of 3d electrons subject to strong spin fluctuations. Similarly, in Cr, an elemental itinerant antiferromagnet (IAFM) with a spin density wave (SDW) ground state, its 3d character has been deemed crucial to it being magnetic. Here we report the discovery of the first IAFM compound with no magnetic constituents, TiAu. Antiferromagnetic order occurs below a Neel temperature T_N ~ 36 K, about an order of magnitude smaller than in Cr, rendering the spin fluctuations in TiAu more important at low temperatures. This new IAFM challenges the currently limited understanding of weak itinerant antiferromagnetism, while providing long sought-after insights into the effects of spin fluctuations in itinerant electron systems.

22 pages, 9 figures

References in corpus (6)

• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Anisotropy in the electrical resistivity and susceptibility of superconducting BaFe${}_2$As${}_2$ single crystals
• Antiferromagnetic superexchange interactions in LaOFeAs
• Ordered Array of Single Adatoms with Remarkable Thermal Stability: Au/Fe3O4(001)
• Ordered Array of Single Au Adatoms with Remarkable Thermal Stability: Au/Fe3O4(001)

Cited by in corpus (14)

• Antiferromagnetic spintronics
• Complex Spin Hamiltonian Represented by Artificial Neural Network
• Flat-Band Itinerant Antiferromagnetism in the Kagome Metal CoSn1-xInx
• Structural Instability and Magnetism of Superconducting KCr${}_3$As${}_3$
• Transitions from a Kondo-like diamagnetic insulator into a modulated ferromagnetic metal in ${\mathrm{FeGa}}_{3-\mathbf{y}}{\mathrm{Ge}}_{\mathbf{y}}$
• Weak itinerant magnetic phases of La2Ni7
• Exceedingly Small Moment Itinerant Ferromagnetism of Single Crystalline La${}_5$Co${}_2$Ge${}_3$
• Relation between the weak itinerant magnetism in $A_2$Ni${}_7$ compounds ($A$ = Y, La) and their stacked crystal structures
• Field-induced quantum critical point in the new itinerant antiferromagnet Ti${}_3$Cu${}_4$
• Hard X-ray spectroscopy of the itinerant magnets $R$Fe${}_4$Sb${}_{12}$ ($R=$Na, K, Ca, Sr, Ba)
• Driven charge density modulation by spin density wave and their coexistence interplay in SmFeAsO: A first-principles study
• Effects of chemical disorder in the itinerant antiferromagnet Ti${}_{1-x}$V${}_x$Au
• Anomalous temperature-dependent magnetization in the nearly collinear antiferromagnet Y${}_2$Co${}_3$
• Decoupling of itinerant and localized $d$-orbital electrons in the compound Sc${}_{0.5}$Zr${}_{0.5}$Co