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Heavy Fermi and non-Fermi liquid behavior, superconductivity, and magnetism inf-electron metals.

机译：重费米和非费米液体行为，超导电性和磁性低电子金属。

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摘要

Measurements of the low temperature specific heat C, magnetic susceptibility χ, and the electrical resistivity ρ of the U1−x YxPd2Al3 system reveal non-Fermi liquid (NFL) behavior for yttrium concentrations 0.65 ≤ x ≤ 0.85. This system exhibits characteristic NFL temperature dependences at low T; C/T ∼ −lnT or T−1+λ, χ ∼ 1 − cT1/2, and ρ ∼ 1 − a(T/T0)n with 1 ≤ n ≤ 1.5. The antiferromagnetic transition temperature decreases with increasing concentration x for 0 ≤ x ≤ 0.25, while a spin glass regime persists from x = 0.25 to x = 0.65. With increasing Y concentration x, the spin glass freezing temperature is suppressed to 0 K. The onset of the NFL properties coincides with this T = 0 K phase transition, which suggests that the NFL behavior originates from a quantum critical point.; Details of both construction and implementation of a new calorimeter system are discussed. The reduced addenda for this system enables us to measure small (∼40 mg) samples. Two systems investigated with this apparatus, CeRh1−xCoxIn5 and Lu1−x YbxNi2B2C, are discussed in detail.; Specific heat measurements of the CeRh1−xCoxIn 5 system reveal the occurrence of superconductivity in compounds with 0.4 ≤ x ≤ 1.0 and antiferromagnetic order in compounds with 0.2 ≤ x ≤ 0.7. Superconductivity and antiferromagnetism appear to coexist for concentrations in the range 0.4 ≤ x ≤ 0.7. The total entropy under the superconducting and antiferromagnetic transitions is constant for the samples with 0 ≤ x ≤ 0.8, indicating that the same electrons are participating in the two processes.; The interplay between superconductivity and heavy fermion behavior in the Lu1−xYbxNi2B2C system was investigated with specific heat measurements. The system shows a sharp decrease in the superconducting transition temperature and a monotonic increase in the electronic specific heat coefficient with increasing Yb concentration x. The curve of reduced specific heat jump ΔC/ΔC0 vs Tc/Tc0, where ΔC0 and Tc0 refer to the LuNi2B2C matrix, does not conform to the BCS theory, but is consistent with magnetic pair breaking theory or the theory for superconductivity in the presence of the Kondo effect for TK/T c0 ∼ 103, where TK is the Kondo temperature.
机译：U 1-x Y x Pd 2 Al的低温比热C，磁化率χ和电阻率ρ的测量 3 系统显示钇浓度为0.65≤x≤0.85的非费米液体（NFL）行为。该系统在低T下表现出典型的NFL温度依赖性。 C / T〜-lnT或T -1 +λ，χ〜1-cT 1/2 ，ρ〜1 − a（T / T 0 ） n 等于1≤ n ≤1.5。对于0≤x≤0.25，反铁磁转变温度随浓度x的增加而降低，而自旋玻璃态则从x = 0.25持续到x = 0.65。随着Y浓度x的增加，旋转玻璃的冻结温度被抑制到0K。NFL特性的开始与此T = 0 K相变相吻合，这表明NFL行为源自量子临界点。讨论了新量热仪系统的构造和实施细节。该系统减少的附加物使我们能够测量少量（〜40 mg）样品。用该设备研究的两个系统是CeRh 1-x Co x In 5 和Lu 1-x Yb <详细讨论了sub> x Ni 2 B 2 C。 CeRh 1-x Co x In 5 系统的比热测量揭示了在0.4≤x≤1.0和反铁磁性的化合物中发生超导≤0.2≤x≤0.7的化合物当浓度在0.4≤x≤0.7范围内时，超导和反铁磁性似乎并存。在0≤x≤0.8的样品中，超导和反铁磁跃迁下的总熵是恒定的，这表明相同的电子参与了这两个过程。 Lu 1-x Yb x Ni 2 B 2 C系统中超导性与重铁原子行为的相互作用用比热测量进行了研究。随着Yb浓度x的增加，系统的超导转变温度急剧下降，电子比热系数单调增加。降低的比热跃迁ΔC/ΔC 0 与T c / T c0 的曲线，其中ΔC 0 和T c0 是指LuNi 2 B 2 C矩阵，不符合BCS理论，但与磁对断裂理论或T K / T c0 〜10 3 的近藤效应存在下的超导理论，其中T K 是近藤温度。

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  • 作者

    Freeman, Eric James.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Physics Condensed Matter.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 O49;
  • 关键词

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