Unconventional Metallic Magnetism inLaCrSb3

Abstract

Neutron-diffraction measurements in LaCrSb3 show a coexistence of ferromagnetic and antiferromagnetic sublattices below T(C)=126 K, with ordered moments of 1.65(4) and 0.49(4)mu(B)/formula unit, respectively (T=10 K), and a spin-reorientation transition at approximately 95 K. No clear peak or step was observed in the specific heat at T(C). Coexisting localized and itinerant spins are suggested.

Suppression of ferromagnetism in the La(VxCr1−x)Sb3system

“…As is shown, the magnetization rises sharply near 130 K for both H b and H c, indicating a transition to a low-temperature fer-Xiao Lin, Valentin Taufour, Sergey L. Bud'ko and Paul C. Canfield romagnetic state. A second anomaly can be observed in both directions at around 100 K, which can be associated with spin reorientation, as suggested by previous studies [18,20]. Below roughly look, the magnetization data in both directions remain almost constant as temperature is lowered.…”

“…Whereas some studies claim LaCrSb 3 is an itinerant ferromagnet [17,18], the nature of its magnetic moments is still under debate. A neutron scattering study suggests a coexistence of localized and itinerant spins in LaCrSb 3 [20]. As La is not moment-bearing, the Cr ion plays the primary role in the magnetism of LaCrSb 3 .…”

“…LaCrSb 3 crystallizes in an orthorhombic structure (space group P bcm), where Cr occupies one single crystallographic site 4c [19]. Extensive investigations into LaCrSb 3 have been undertaken, and the compound is found to have a rich magnetic phase diagram [18,[20][21][22][23]. LaCrSb 3 exhibits unconventional magnetic behavior with a canted ferromagnetism in bc-plane.…”

Magnetic and charge transport properties of the Na-based Os oxide pyrochlore

“…Because all the reasons above are caused by the excess Na and the hydration, we investigated more than 10 pieces of preliminary samples prepared in early experimental stages, which may have different quantity of Na and water per the mole. We found, however, none of those showed superconductivity above 2 K. [17,36], probably accounts for the anomaly. Because a possibility of influence of a little magnetic impurity is not completely rejected, further efforts are needed to reveal magnetic nature of the Na-based Os oxide pyrochlore.…”

“…An expected peak was not obvious at the magnetically characteristic temperature 57 K. Although it is likely that undetectably small mass of a magnetic impurity is responsible for the magnetic anomaly, however a magnetic transition without anomaly in heat-capacity could also account for the anomaly, as intensely discussed for Hg 2 Os 2 O 7 [17]. Besides, unconventional metallic magnetism suggested for LaCrSb 3 could also take responsibility for the magnetic feature [36]. In order to test the possible magnetic models, we measured the C p of Na 1.4 Os 2 O 6 ·H 2 O in a magnetic field of 70 kOe.…”