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Sergey L. Bud'ko

Publications and source records attributed to Sergey L. Bud'ko.

165 records · Page 10Linked to original sources
arXiv2006

Contact-less measurements of Shubnikov-de Haas oscillations in the magnetically ordered state of CeAgSb$_2$ and SmAgSb$_2$ single crystals

Shubnikov - de Haas oscillations were measured in single crystals of highly metallic antiferromagnetic SmAgSb$_{2}$ and ferromagnetic CeAgSb$_{2}$ using a tunnel diode resonator. Resistivity oscillations as a function of applied magnetic field were observed via measurements of skin depth variation. The effective resolution of $Δρ\simeq20$ p$Ω$ allows a detailed study of the SdH spectra as a function of temperature. The effects of the Sm long - range magnetic ordering as well as its electronic structure ($4f$-electrons) on the Fermi surface topology is discussed.

cond-mat.str-el↗
arXiv2004

Annealing-tuned Hall coefficient in single crystals of the YbNi$_2$B$_2$C heavy fermion

We present temperature-dependent magneto-transport measurements on as-grown and annealed YbNi$_2$B$_2$C single crystals. Annealing causes drastic changes in the Hall coefficient, $R_H(T)$. Whereas for as-grown samples the Hall coefficient is negative between room temperature and 2 K, with a pronounced {\it minimum} at $\approx 22$ K, for the samples annealed at $950^\circ$ C for 150 hours, $R_H(T)$ changes its sign twice in the same temperature range: from negative to positive on cooling below $\sim 100$ K and back to negative below $\sim 10$ K, and has a clear {\it maximum} at $\approx 45$ K. Intermediate temperature dependencies can be achieved by reducing the annealing time. These findings are discussed within the framework of an annealing dependence of the skew scattering in conjunction with the recent structural, thermodynamic and transport studies of the effects of annealing in YbNi$_2$B$_2$C.

cond-mat.str-el↗