&mgr;(+) knight shift measurements in U0.965Th0.035Be13 single crystals

Area of Science:

• Condensed matter physics
• Materials science
• Quantum magnetism

Background:

• Understanding the electronic and magnetic properties of heavy fermion compounds like U0.965Th0.035Be13 is crucial.
• Previous studies suggest complex magnetic ordering and electronic behavior in these materials.

Purpose of the Study:

• To investigate the static spin susceptibility (χ(s)) in U0.965Th0.035Be13 single crystals.
• To explore the temperature dependence of magnetic interactions below the transition temperatures T(c1) and T(c2).
• To analyze the normal-state hyperfine coupling between muon spin and U 5f electrons.

Main Methods:

• Muon spin rotation (μSR) spectroscopy was employed.
• Measurements focused on the temperature dependence of the μ(+) Knight shift.

Main Results:

• An abrupt reduction in static spin susceptibility (χ(s)) was observed below T(c1).
• χ(s) remained constant below T(c2), at a value lower than the normal-state susceptibility (χ(n)).
• An anomalous anisotropic temperature dependence of the transferred hyperfine coupling was found in the normal state.

Conclusions:

• The study provides insights into the magnetic phases and spin dynamics of U0.965Th0.035Be13.
• The observed behavior of χ(s) suggests distinct magnetic transitions at T(c1) and T(c2).
• The anomalous hyperfine coupling indicates complex interactions involving U 5f electrons in the normal state.