Linear and nonlinear critical magnetic properties and transport in Nd0.75Ba0.25MnO3 single crystal: evidence for its anomalous critical behavior near TC

Neutron diffraction, magnetization, and ESR studies of pseudocubicNd0.75Ba0.25MnO3and its critical behavior aboveTCRyzhov1, Lazuta2, Smirnov3 et al. 2005Phys. Rev. B190130View full textAdd to dashboardCite

“…The ac linear response [15] and ESR measurements (see Fig.5) give a slightly less value of γ ≈ 1.32 that is due to the demagnetization effects because a fit of the M/H = χ ext data yields also a close magnitude of γ.…”

“…A single crystal with a mass $m$ = 91.8 mg was used that came from the same growth batch as the crystal of work [15].…”

“…In ESR study, the small part of single crystal investigated in work [15] with a mass m ≈ 1.6 mg was used. We employed a special X-band ESR spectrometer (f = 8.37 GHz) described earlier [18,19].…”

“…Below T * ≈ 143 K the nonlinear response of the compound reveals features of the PS magnetic state that can signal the first order transition [15]. It is natural, therefore, to expect a temperature hysteresis of the ESR signal.…”

“…The neutron diffraction investigations have been also performed to elucidate the effects of the lattice distortions and orbital ordering. The study of the critical magnetic properties of the x = 0.23 (T C ≈ 124 K) and x = 0.25 (T C ≈ 129 K) manganites revealed a more complicated scenario than that expected for the 3D isotropic ferromagnets [12,13,14,15]. The conventional critical behavior was observed to proceed for T * < T < 2T C where T * ≈ 147 K (x = 0.23) and T * ≈ 143 K (x = 0.25).…”