Cabrera-Baez M, Iwamoto W, Magnavita E T, Osorio-Guillén J M, Ribeiro R A, Avila M A, Rettori C
CCNH, Universidade Federal do ABC (UFABC), Santo André, SP 09210-580, Brazil.
J Phys Condens Matter. 2014 Apr 30;26(17):175501. doi: 10.1088/0953-8984/26/17/175501. Epub 2014 Apr 8.
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.
随着最近在约1 K温度下发现可能具有丝状超导特性的金属间化合物YIn₃，人们对其电子结构的兴趣再度燃起。在这项工作中，我们对掺Gd(³⁺)的YIn₃（Y₁₋ₓGdₓIn₃；0.001⪅x⩽̸0.08）进行了电子自旋共振（ESR）实验，结果表明，由于Gd(³⁺)局域磁矩与传导电子（ce）之间的交换相互作用，Gd(³⁺)离子的自旋 - 晶格弛豫是通过YIn₃费米能级处存在的s - 、p - 和d型ce来进行的。这些发现通过类科林加弛豫率d(ΔH)/dT和g位移（Δg = g - 1.993）对Gd(³⁺)浓度的依赖性得以揭示，其中类科林加弛豫率对s电子表现出瓶颈弛豫行为，对p和d电子表现出非瓶颈行为。类科林加弛豫率从x⪅0.001时的22(2) Oe/K变化到x = 0.08时的8(2) Oe/K，g位移值分别从正的Δg = +0.047(10)变化到负的Δg = -0.008(4)。基于三带ce模型的分析允许提取相应的交换相互作用参数Jfs、Jfp和Jfd。
