Systematic study of anisotropic transport and magnetic properties of RAgSb2 (R=Y, La–Nd, Sm, Gd–Tm)
Systematic study of anisotropic transport and magnetic properties of RAgSb2 (R=Y, La–Nd, Sm, Gd–Tm)
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DOI：
10.1016/s0304-8853(99)00472-2
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发表时间：
1999-10
影响因子：
2.7
通讯作者：
K.D Myers;S. Bud’ko;I.R Fisher;Z. Islam;H. Kleinke;A.H Lacerda;P. Canfield
中科院分区：
文献类型：
--
作者：
K.D Myers;S. Bud’ko;I.R Fisher;Z. Islam;H. Kleinke;A.H Lacerda;P. Canfield
对R=Y，La-ND，Sm，Gd-Tm的高质量RAgSb2系列化合物单晶的磁学和输运性质进行了各向异性测量。对于这些化合物中的大多数，由于Hund规则基态的晶态电场(CEF)分裂而产生的强磁各向异性，将力矩限制在基面上。在DyAgSb2中也观察到了基面内的附加各向异性，导致了一系列的超磁相变。除了非磁性化合物LaAgSb2和YAgSb2和铁磁性化合物CeAgSb2外，所有化合物在低温下都是反铁磁性的。对于R=Y，在低至30kOe的磁场和高至25K的温度下，可以测量到La-ND和Sm Clear de Haas-van Alphen振荡。在整个系列中，低温横向磁阻很大[Δρ(H)/ρ(0)≈60 in SmAgSb2at 55kOe]，并且强烈偏离二次型行为，与场的Δρ(H)/ρ(0)的关系在H0.8到H1.5之间。
Anisotropic measurements of the magnetic and transport properties have been performed on high-quality single crystals of the RAgSb2series of compounds with R=Y, La–Nd, Sm, Gd–Tm. For most of these compounds, strong magnetic anisotropies, created by crystalline electric field (CEF) splitting of the Hund's rule ground state, confine the moments to the basal plane. Additional anisotropy within the basal plane is also observed in DyAgSb2, leading to a series of metamagnetic transitions. All of the compounds order antiferromagnetically at low temperatures except for the nonmagnetic compounds LaAgSb2and YAgSb2and the ferromagnetic compound CeAgSb2. For R=Y, La–Nd, and Sm clear de Haas–van Alphen oscillations in fields as low as 30 kOe and at temperatures as high as 25K can be measured. Throughout the series, the low-temperature transverse magnetoresistance is large [Δρ(H)/ρ(0)≈60 in SmAgSb2at 55kOe] and deviates strongly from quadratic behavior with field the dependence of Δρ(H)/ρ(0) ranging between H0.8and H1.5.