Magnetization and resistivity ofUNi4B in high magnetic fields

Abstract

Magnetization and resistivity of UNi4B in high magnetic fieldsMentink, S.A.M.; Nieuwenhuys, G.J.; Nakotte, H.; Menovsky, A.A.; Drost, A.; Frikkee, E.; Mydosh, J.A.

Kondo Screening and Magnetic Ordering in FrustratedUNi4B

“…Below T N 20 K neutron diffraction, experiments [1,2] indicate that only 2͞3 of the U moments order antiferromagnetically in a complex structure, the magnetic unit cell involving nine U atoms, as can be seen in Fig. 1(b).…”

“…The application of a magnetic field along the c-axis direction or parallel to the basal plane shows the strong anisotropy of the system. In the basal plane, two or three (more cannot be excluded) jumps for the magnetization are observed, depending on the field direction [2]. This structure has been interpreted [2] assuming two independent spin systems, one which orders while the other remains paramagnetic down to low temperatures.…”

“…In the basal plane, two or three (more cannot be excluded) jumps for the magnetization are observed, depending on the field direction [2]. This structure has been interpreted [2] assuming two independent spin systems, one which orders while the other remains paramagnetic down to low temperatures. It was proposed that 1͞3 of the U atoms forms chains within the ordered spin matrix that keep their one-dimensional character because the local field vanishes on those sites.…”

“…This procedure allows us to consider both magnetic and nonmagnetic sites simultaneously, in contrast with the previous analysis [2]. At high temperature the U magnetic moment is estimated m i 2.9m B ͞U atom but below T N , in the ordered phase, the effective moment of the magnetic sites is m 0 1.2m B ͞U atom [2]. The last term in Eq.…”

“…In a series of recent papers [1][2][3][4] the interesting magnetic behavior of UNi 4 B was discussed. This intermetallic compound crystallizes in a CeCo 4 B-type structure, space group P6͞mmm, in which UNi and UB planes alternate with Ni planes in between, see Fig.…”