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0TRANSPORT PROPERTIES AND KOHLER'S RULE IN ^Lui-xBii SOLID SOLUTIONS WITH x<0.03: DO CHARGE STRIPES REALLY EXIST IN METALLIC
DODECABORIDES?
Anisimov M.1' 2, Samarin N.1, Krasnorussky V.2, Azarevich A.1, Bogach A.1, Glushkov V.1, Demishev S.1 2' 3, Voronov V.1, Shitsevalova N.4
iProkhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia,
E-mail: anisimov.m.a@gmail.com 2Vereshchagin Institute for High Pressure Physics of RAS, Troitsk, Russia 3National Research University 'Higher School of Economics', Moscow, Russia 4Frantsevich Institute for Problems of Materials Science NASU, Kyiv, Ukraine
Nonmagnetic LuBi2 with completely filled 4f shell is a metal with small enough Sommerfeld coefficient y ~ 3.3 - 4.1 mJ/(mol-K2) and one conduction electron per formula unit. LuBi2 becomes superconducting at Tc ~ 0.4K [1]. LuBi2 is also known to exhibit considerable transport anisotropy [2, 3], which was explained in literature by different mechanisms including possible formation of dynamic charge stripes directed along [110] below the point ~ 150 K [3]. Here we study transport properties of solid solutions based on LuBi2 host compound with general formula RxLui-xBi2 (R-Dy, Er, Tm, Yb, Lu) and with x < 0.03. The experiment has been performed on single crystals of high quality in the temperature range 1.8 - 300 K in magnetic fields up to 82 kOe. The appl ication of several models to the analysis of zero-field resistivity is discussed. A phenomenological description of large positive quadratic component of magnetoresistance Ap/p(H) = ^d2H2, which dominates for all RxLui-xBi2 compounds under investigation, allows to estimate drift mobility exponential changes ^d ~ T~a with the index a ~ 0.95 - 1.46.
In order to check the existence of additional channel of scattering, caused by probable presence of dynamic charge stripes, we performed the study of the anisotropy of magnetoresistance in Dyo.oiLuo.99Bi2 and Tmo.o3Luo.97Bi2 including the measurements of the field scans along three principal crystallographic directions H||[ioo], H||[iio] and H||[iii] of a cubic structure (only two orientations H||[ioo], H||[iio] for the last compound). The data obtained allow us to confirm the fulfillment of semi-empirical Kohler's rule in a wide interval of temperatures 30 - 240 K (T > 60 K only for H||[i ii]) regardless of the orientation of magnetic field. This result was attributed as a proof of the absence of additional channel of scattering caused by stripes. We argue, that charge-transport anisotropy is originated in RxLui-xBi2 due to the anisotropy of electron-phonon scattering on the one hand and the effects of Fermi surface topology (at low temperatures) on the other.
References
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2. Heinecke M., Winzer K., Noffke J., Kranefeld H., Grieb H., Flachbart K., Paderno Yu. B. // Z. Phys. B: Condens. Mat. - i995. - V. 98. - P. 23i-237.
3. Sluchanko N., Azarevich A., Bogach A., Demishev S., Krasikov K., Voronov V., Filipov V., Shitsevalova N., Glushkov V. // Phys. Rev. B. - 2o2i. - V. io3. - P. o35ii7.
