Gd3+ spin-lattice relaxation via multi-band conduction electrons in Y(1-x)Gd(x)In3: an electron spin resonance study.
Interest in the electronic structure of the intermetallic compound YIn3 has been renewed with the recent discovery of superconductivity at T ∼ 1 K, which may be filamentary in nature. In this work we perform electron spin resonance (ESR) experiments on Gd(3+) doped YIn3 (Y1-xGdxIn3; 0.001 ⪅ x ⩽̸ 0.08), showing that the spin-lattice relaxation of the Gd(3+) ions, due to the exchange interaction between the Gd(3+) localized magnetic moment and the conduction electrons (ce), is processed via the presence of s-, p- and d-type ce at the YIn3 Fermi level. These findings are revealed by the Gd(3+) concentration dependence of the Korringa-like relaxation rate d(ΔH)/dT and g-shift (Δg = g - 1.993), that display bottleneck relaxation behavior for the s-electrons and unbottleneck behavior for the p- and d-electrons. The Korringa-like relaxation rates vary from 22(2) Oe/K for x ⪅ 0.001 to 8(2) Oe/K for x = 0.08 and the g-shift values change, respectively, from a positive Δg = +0.047(10) to a negative Δg = -0.008(4). Analysis in terms of a three-band ce model allows the extraction of the corresponding exchange interaction parameters Jfs, Jfp and Jfd.
CCNH, Universidade Federal do ABC (UFABC), Santo André, SP 09210-580, Brazil.
M
M
Cabrera-Baez
W
W
Iwamoto
E T
ET
Magnavita
J M
JM
Osorio-Guillén
R A
RA
Ribeiro
M A
MA
Avila
C
C
Rettori
D003198:Computer Simulation; D004553:Electric Conductivity; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D004579:Electron Transport; D004583:Electrons; D005682:Gadolinium / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D008422:Materials Testing; D008956:Models, Chemical; D013113:Spin Labels; D015019:Yttrium / Q000737:chemistry*
D013113:Spin Labels; D007204:Indium; D015019:Yttrium; D005682:Gadolinium