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首页> 外文期刊>Journal of the Physical Society of Japan >Temperature-Induced Change in the Magnitude of the Effective Density of States: A NQR/NMR Study of the A-Site-Ordered Perovskite System CaCu_3Ru_4O_(12)
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Temperature-Induced Change in the Magnitude of the Effective Density of States: A NQR/NMR Study of the A-Site-Ordered Perovskite System CaCu_3Ru_4O_(12)

机译：温度引起的有效态态强度的大小变化：A站点有序钙钛矿体系CaCu_3Ru_4O_（12）的NQR / NMR研究

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摘要

NQR/NMR measurements, including spin–lattice relaxation rate (1/T_1) and Knight shift (K) evaluations, have been carried out for Cu and Ru nuclear spins in the A-site ordered perovskite system CaCu_3Ru_4O_(12), which exhibits a mass-enhancement-like behavior although it possesses no f electrons. The temperature evolution of T_1 for Cu, which was measured up to 700 K, exhibits I /T_1 T = constant behavior at high enough temperatures. This clearly denies the existence of a Cu localized moment, which was previously suggested as the origin of the mass enhancement in a dense Kondo scenario. Furthermore, K and (1/T_1 T) for Cu exhibit significant temperature dependences with two characteristic temperatures T_F = 20 K and T_X = 180 K, suggesting a temperature-induced transition of microscopic electronic character at T_F and T_X. We propose a two–band model, where the effective density of states for one of the bands shows a significant temperature dependence in T_F < T < T_X. Possible origins are discussed.
机译：已在A站点有序钙钛矿体系CaCu_3Ru_4O_（12）中对Cu和Ru核自旋进行了NQR / NMR测量，包括自旋-晶格弛豫率（1 / T_1）和奈特位移（K）评估。像质量增强一样的行为，尽管它没有f电子。 Cu的T_1的温度演变（最高测量到700 K）表现出I / T_1 T =在足够高的温度下的恒定行为。这显然否认存在Cu局部矩，而Cu局部矩先前被认为是密集的近藤场景中质量增强的起源。此外，Cu的K和（1 / T_1 T）在两个特征温度T_F = 20 K和T_X = 180 K时表现出显着的温度依赖性，这表明温度诱导的微观电子特征在T_F和T_X处的转变。我们提出了一个两频带模型，其中一个频带的有效状态密度在T_F

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