Evidence of ferromagnetically coupled Nd3+ ion pairs in weakly doped Nd:LiYF4 and Nd:YVO4 crystals as revealed by high-resolution optical and EPR spectroscopies

被引:58
作者
Guillot-Noël, O
Mehta, V
Viana, B
Gourier, D
Boukhris, M
Jandl, S
机构
[1] Ecole Natl Super Chim Paris, Lab Chim Appl Etat Solide, UMR CNRS 7574, F-75231 Paris 05, France
[2] Univ Sherbrooke, Dept Phys, Ctr Rech Phys Solide, Sherbrooke, PQ J1K 2R1, Canada
关键词
D O I
10.1103/PhysRevB.61.15338
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Electron paramagnetic resonance (EPR) and high-resolution fluorescence spectra of Nd3+ ions in weakly doped LiYF4 and YVO4 crystals are analyzed. A simple model, based on an effective spin-Hamiltonian approach is proposed to explain the general features of the EPR and optical neodymium spectra in these matrices. Pairs of satellite lines whose intensities grow with neodymium content an observed on each side of the main EPR signals of isolated Nd3+ ions. These satellites are assigned to Nd3+-Nd3+ ion pairs coupled by magnetic dipolar interaction. The calculated Nd-Nd distances are found to be in good agreement with the Y3+-Y3+ distances in LiYF4 and YTO4 hosts. The concentration-dependent satellites accompanying the neodymium F-4(3/2) --> I-4(9/2) transition are quantitatively explained as being due to several types of ferromagnetically coupled pairs of Nd3+ ions, each ion of a pair being located at the regular Y3+ site with S-4 and D-2d point symmetry in LiYF4 and YVO4, respectively. The exchange coupling values J are found in the range +0.8 to +4.9 cm(-1). From literature data. it appears that such ferromagnetically coupled Nd3+ pairs with J = +3 cm(-1) also quantitatively explain the optical satellite structure in Nd:Y3Al5O12 (YAG).
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页码:15338 / 15346
页数:9
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