Isotope effect in charge transport of LuB{sub 12}

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S1063776110080212· OSTI ID:21443435

Azarevich, A N; Bogach, A V; Glushkov, V V; Demishev, S V; Kuznetsov, A V; Lyubshov, K S ^[1]; Filippov, V B; Shitsevalova, N Yu ^[2]

---

1. Russian Academy of Sciences, Prokhorov Institute of General Physics (Russian Federation)
2. National Academy of Sciences of Ukraine, Institute for Problems of Material Science (Ukraine)

The galvanomagnetic properties of single-crystal samples with various isotopic boron compositions have been investigated for the first time for the normal state of superconductor LuB{sub 12} (Tc {approx} 0.44 K). Precision measurements of the resistivity, Hall coefficient, and magnetic susceptibility have been performed over a wide temperature range of 2-300 K in magnetic fields up to 80 kOe. A change of the charge transport regime in this nonmagnetic compound with metallic conduction is shown to occur near T* {approx} 50-70 K. As a result, a sharp peak with significantly different amplitudes for Lu{sup 10}B{sub 12} and Lu{sup 11}B{sub 12} is recorded in the temperature dependences of the Hall coefficient R{sub H}(T) near T*. A significant (about 10%) difference (in absolute value) of the Hall coefficients R{sub H} for the Lu{sup 10}B{sub 12} and Lu{sup 11}B{sub 12} compounds at helium and intermediate temperatures has been found and the patterns of behavior of the dependence R{sub H}(H) for T < T* in an external magnetic field H {<=} 80 kOe for Lu{sup 10}B{sub 12} and Lu{sup 11}B{sub 12} are shown to differ significantly. Analysis of the Curie-Weiss contribution to the magnetic susceptibility {chi}(T) leads to the conclusion about the formation of magnetic moments {mu}{sub eff} {approx} (0.13-0.19){mu}{sub B} in each unit cell of the fcc structure of LuB{sub 12} compounds with various isotopic compositions. The possibility of the realization of an electronic topological 2.5-order transition near T* and the influence of correlation effects in the 5d-band on the formation of a spin polarization near the rare-earth ions in LuB{sub 12} is discussed.

• OSTI ID: 21443435
• Journal Information: Journal of Experimental and Theoretical Physics, Vol. 111, Issue 2; Other Information: DOI: 10.1134/S1063776110080212; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHARGE TRANSPORT
CORRELATIONS
CURIE-WEISS LAW
ELECTRIC CONDUCTIVITY
FCC LATTICES
ISOTOPE EFFECTS
ISOTOPE RATIO
LUTETIUM BORIDES
LUTETIUM IONS
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MONOCRYSTALS
SPIN ORIENTATION
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
BORIDES
BORON COMPOUNDS
CHARGED PARTICLES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
DIMENSIONLESS NUMBERS
ELECTRICAL PROPERTIES
IONS
LUTETIUM COMPOUNDS
MAGNETIC PROPERTIES
ORIENTATION
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS