Anisotropy of transport properties of novel Kondo ferromagnet UAsSe

Electrical transport properties of USbSe and USbTe

“…[8] for USbTe and attributed to coherent Kondo scattering. From the characteristic maxima observed in the temperature dependencies of the thermoelectric power of USbSe measured along the c-axis and a-axis (see the figure) we may estimate the Kondo temperature as T K ∼ 25 K. Interestingly, analogous features in S(T) at nearly the same temperatures were reported for single crystals of UPS [6] and UAsSe [13], both characterized by the presence of LT resistivity upturns, as well as for a UAsS single crystal for which no resistivity upturn was revealed [14]. This finding implies that the observed behaviour cannot be related to a TLS phenomenon.…”

A low-temperature electron diffraction study of structural disorder and its relationship to the Kondo effect in ThAsSe

“…1) displayed qualitatively very similar behavior to UAsSe (above 109 K) with negative dr=dT from about 70 up to about 500 K [1], however, ruled out a scattering mechanism of magnetic origin. More recent examination of the magnetoresistivity of UAsSe at liquid He temperature [8][9][10] likewise suggests that the dominant scattering mechanism in both materials is of a structural rather than magnetic origin.…”

“…Ever since the initial discovery of these unusual low-temperature transport properties in UAsSe, there has been much interest in the Kondo scattering mechanism/s responsible [1][2][3][4][5][6][7][8][9][10]. The fact that UAsSe becomes ferromagnetic below T c B110 K [2] initially suggested a scattering mechanism of magnetic origin related to the original Kondo effect [11].…”

Angle-resolved photoemission study of dispersive and narrow-band5fstates in UAsSe

“…[13][14][15] Uranium arsenoselenide is a hard ferromagnet with coercive force 0.8 T for the H ʈ c axis. 16 The magnetocrystalline anisotropy of UAsSe is very high, and the ordered moment equals 1.5 B /U.…”

“…12,23 The origin of this upturn has been extensively studied, [14][15][16]24 but not fully clarified. It has been speculated recently 13,25 that the anomaly might be related to a nonmagnetic Kondo effect generated by a small disorder in the occupation of the anion sublattice ͑i.e., As on Se sites and vice versa͒.…”