Structural, magnetic and transport properties of single-crystalline

Abstract

Single crystals of the heavy-electron compound have been grown by a modified mineralization technique. The x-ray structure refinement shows that single crystals form in the structure, instead of the structure reported for polycrystalline material. The polymorphism of is attributed to the experimental parameters, such as pressure and temperature, during the sample preparation process. The single-crystal susceptibility data reveal a weak maximum for at K, indicating the presence of short-range antiferromagnetic correlations, while has the tendency to diverge at low T (T > 2 K). The electrical resistivity of the single crystals (T > 0.3 K) is best described by with for and for . The magnetic and transport data show pronounced deviations from the standard Fermi-liquid picture, and lead to a classification of as a non-Fermi-liquid compound. As the origin of NFL behaviour in we propose the proximity to a quantum critical point or Kondo disorder.

Singular or non-Fermi liquids

“…The compound YbRh 2 S 2 seems to have similar properties [258]. Related properties have also been found in U 2 Pt 2 In [88,89] [250]. The SFL properties observed at the Mott insulator-to-metal transition in BaVS 3 [99] are also of related interest.…”

HIGH PRESSURE TRANSPORT STUDY OF NON-FERMI LIQUID BEHAVIOUR IN U2Pt2In AND U3Ni3Sn4

“…[6,7]. The NFL properties are summarised by: (i) the specific heat varies as c(T) ~ -Tln(T/T 0 ) over almost two decades of temperature (T = 0.1-6 K), (ii) the magnetic susceptibility shows a weak maximum at T m = 8 K for B || c (tetragonal structure), while it increases as T 0.7 when T→0 for B || a, and (iii) the electrical resistivity obeys a power law T α with α = 1.25±0.05 (T < 1 K) and 0.9±0.1 (T→0), for the current along the a and c axis, respectively.…”

High-pressure study of the non-Fermi liquid material U 2 Pt 2 In

“…compound [2,3]. Currently, NFL compounds attract much attention [4][5][6], because NFL behavior may be considered to represent a new ground state.…”

“…Currently, NFL compounds attract much attention [4][5][6], because NFL behavior may be considered to represent a new ground state. In the case of U 2 Pt 2 In, the NFL properties are summarized by: (i) the specific heat varies as c(T) ~ -Tln(T/T 0 ) over almost two decades of temperature ( T = 0.1-6 K) [2], (ii) the magnetic susceptibility shows a weak maximum at T m = 8 K for a magnetic field along the c axis (tetragonal structure), while it increases as T 0.7 when T→0 for a field along the a axis [3], and (iii) the electrical resistivity obeys a power law T α with α = 1.25±0.05 (T < 1 K) and 0.9±0.1 (T→0), for the current along the a and c axis, respectively [7]. It is important to realize that U 2 Pt 2 In is one of the rare stoichiometric (undoped) compounds which exhibits NFL behavior at ambient pressure.…”