Synthesis and magnetic properties of ALnO2 (A=Cu or Ag; Ln=rare earths) with the delafossite structure

Abstract

Synthesis, structures, and magnetic properties of ternary rare earth oxides ALnO 2 (A = Cu or Ag; Ln = rare earths) have been investigated. CuLnO 2 (Ln = La, Pr, Nd, Sm, Eu) were synthesized by the direct solid state reaction of Cu 2 O and Ln 2 O 3 , and AgLnO 2 (Ln = Tm, Yb, Lu) were obtained by the cation-exchange reaction of NaLnO 2 and AgNO 3 in a KNO 3 flux.These compounds crystallized in the delafossite-type structure with the rhombohedral 3R type (space group: R-3m). Magnetic susceptibility measurements showed that these compounds are paramagnetic down to 1.8 K. Specific heat measurements down to 0.4 K indicated that CuNdO 2 ordered antiferromagnetically at 0.8 K.3

Field-induced instability of the quantum spin liquid ground state in the Jeff=12 triangular-lattice compound NaYbO2

“…At low temperatures, we observed a large χ 0 value, which includes the Van-Vleck susceptibility χ VV , arising from CEF excitations [41]. Such a large low-temperature χ VV contribution is typical for Yb-based compounds [16,42].…”

YbMgGaO4: A Triangular‐Lattice Quantum Spin Liquid Candidate

“…Inspired by the works of YbMgGaO 4 , recently another large family of rare‐earth triangular antiferromagnets, ARX 2 (space group: R‐3m ), had been extensively studied as well, where A + = Ag + , Na + , R 3+ = rare‐earth ions, and X 2− = O 2− , S 2− , Se 2− . Among them, NaYbS 2 and NaYbO 2 have captured most special interest.…”

A review on the p-type transparent Cu–Cr–O delafossite materials

“…Cu-based delafossites have attracted attention due to their expected large hole mobility, a result of the mixing of Cu 3d and O 2p states forming the valence band. It has been reported that this delafossite structure allows the hosting of a multitude of M cations, namely p-block elements (Al [49,103,104], B [105][106][107], Ga [54,108,109] or In [110][111][112][113]), transition metals (Co [114,115], Cr [82,116,117], Fe [118][119][120], Mn [121,122], Rh [123], Sc [124][125][126] and Y [89,[126][127][128]), or lanthanides (La [129][130][131], Nd [132], Pr [133], Sm and Eu [134]). These materials were thoroughly investigated as they demonstrated interesting properties in the different fields: antibacterial [135,136], batteries [137], (photo)catalyse [83,131,[138][139][140], lumine...…”