27 research outputs found

    Heavy-electron antiferromagnetism in CePt2Sn2.

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    Possible correlated-electron behavior from quadrupolar fluctuations in PrInAg2

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    The temperature dependent magnetic susceptibility; specific heat, and electrical resistivity were measured on PrInAg2. A broad peak, which is identified as a Kondo anomaly, is observed in the specific heat at similar to 0.4 K with a strongly enhanced linear contribution at lower temperatures. PrInAg2 is a Pr-based heavy-fermion compound and has one of the largest known Sommerfeld coefficients of similar to 6.5 J/mol K-2. A new type of nonmagnetic interaction between the conduction electrons and the non-Kramers doublet ground state of the Pr3+ ion be responsible for this behavior. Related features are also observed in the susceptibility and resistivity.This article is published as Yatskar, A., W. P. Beyermann, R. Movshovich, and P. C. Canfield. "Possible correlated-electron behavior from quadrupolar fluctuations in PrInA g 2." Physical review letters 77, no. 17 (1996): 3637. DOI: 10.1103/PhysRevLett.77.3637. Copyright 1996 American Physical Society. Posted with permission

    Heavy-electron behavior in single-crystal YbNi2B2C

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    We have measured the magnetic susceptibility, specific heat, and electrical resistivity on single crystals of the intermetallic borocarbide YbNi2B2C. An enhanced linear contribution is observed in the specific heat with a Sommerfeld coefficient of 530 mJ/mol K-2, indicative of a heavy-electron system with a Kondo temperature similar to 10 K. The magnetic susceptibility, which is anisotropic and Curie-Weiss-like at high temperature, is also consistent with our interpretation of a strongly correlated ground state at low temperatures and crystal-electric-field excitations at higher temperatures. At T=1.8 K, the Wilson ratio is determined to be: 0.85 using the high-temperature effective moment. The resistivity shows a quadratic temperature dependence below 1.5 K with a T-2 coefficient of 1.2 mu Omega cm K-2. Unlike the other members of the series RNi(2)B(2)C (R=Y. Gd-Lu), YbNi2B2C does not order above our lowest measurement temperature of 0.34 K. The suppression of superconductivity in YbNi2B2C is consistent with a significantly enhanced hybridization between the conduction electrons and the 4f states.This article is published as Yatskar, A., N. K. Budraa, W. P. Beyermann, P. C. Canfield, and S. L. Bud'ko. "Heavy-electron behavior in single-crystal Yb Ni 2 B 2 C." Physical Review B 54, no. 6 (1996): R3772. DOI: 10.1103/PhysRevB.54.R3772. Copyright 1996 American Physical Society. Posted with permission
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