Magnetic properties of frustrated Y-doped GdInCu4GdInCu4

We report temperature dependent magnetic susceptibility and electron spin resonance (ESR) measurements on single crystals of the frustrated antiferromagnet Gd1-xYxInCu4Gd1-xYxInCu4 (x=0,0.01x=0,0.01, 0.05 and 0.1). The magnetic susceptibility data revealed, as expected, a decreasing in the antiferromagnetic ordering temperature as function of the Y-concentration, while the high-TT Curie–Weiss temperatures remain nearly unaffect by the doping. For T≳100K, a single Dysonian Gd3+Gd3+ ESR line with a nearly temperature independent g∼1.989(8)g∼1.989(8) is observed, and its linewidth follows a Korringa-like (ΔH/ΔT∼0.75(5)Oe/K) behavior as a function of temperature. Below T≈100K both the ESR g  -value and linewidth are affected by the presence of strong short-range magnetic correlation in the paramagnetic phase well above TNTN, consistently with the frustrated character of this compound. The role of chemical disorder and dilution effects induced by Y-doping in the properties of this highly frustrated material is discussed.