Incommensurate antiferromagnetic order in the manifoldly-frustrated SrTb2O4 with transition temperature up to 4.28 K

Abstract

The Néel temperature of the new frustrated family of SrRE 2 O 4 (RE = rare earth) compounds is yet limited to ∼0.9 K, which more or less hampers a complete understanding of the relevant magnetic frustrations and spin interactions and an exploration of potential interesting properties. Here we report on a new frustrated member to the family, SrTb 2 O 4 with a record T N = 4.28(2) K, and an experimental study of the magnetic interacting and frustrating mechanisms by polarized and unpolarized neutron scattering. The compound SrTb 2 O 4 displays an incommensurate antiferromagnetic (AFM) order with a transverse wave vector Q 0.5K = (0.5924(1), 0.0059(1), 0) albeit with AFM partially-ordered moments, 1.92(6) μ B at 0.5 K, stemming from only one of the two inequivalent Tb sites mainly by virtue of their different octahedral distortions. The localized moments are confined to the bc plane, 11.9(66) • away from the b axis probably by single-ion anisotropy. We reveal that this AFM order is dominated mainly by dipole-dipole interactions and disclose that the octahedral distortion, nearest-neighbour (NN) ferromagnetic (FM) arrangement, different next NN FM and AFM configurations, and in-plane anisotropic spin correlations are vital to the magnetic structure and associated multiple frustrations. The discovery of the thus far highest AFM transition temperature renders SrTb 2 O 4 a new friendly frustrated platform in the family for studying the nature of magnetic interactions and frustrations and exploring potential macroscopic functionalities and new quantum states.

Distinct itinerant spin-density waves and local-moment antiferromagnetism in an intermetallic ErPd2Si2 single crystal

“…Nuclear coherent scattering of polarized neutrons will not flip the neutron spin. Magnetic scattering via polarized neutrons can flip the neutron spin and is determined by the relative direction of the neutron polarization vector with regard to both the scattering vector and the direction of the ordered-moments 56 57 . In our study, is normal to the scattering plane ( H , 0, L ), i.e., parallel to the b (or a ) axis.…”

Magnetic ordering in the frustratedJ1−J2Ising chain candidateBaNd2O4

“…In contrast, NPD shows that SrYb 2 O 4 is characterized by long-range Néel order on both Yb sites, although the ordered Yb moment is drastically suppressed on one of the two sites [22]. Finally, SrDy 2 O 4 shows evidence for quasi-1D, UUDD magnetic correlations in zero field down to 50 mK [16], SrTb 2 O 4 displays long-range incommensurate magnetic order arising from only one of the two Tb sites [23], and SrTm 2 O 4 shows no signs of magnetic ordering down to 65 mK [24]. The low or nonexistent magnetic ordering temperatures, coupled with the variety of observed behavior, suggest that some combination of competing exchange interactions, single ion anisotropy, magnetic dipole interactions, and low dimensionality play important roles in shaping the magnetic phase diagrams of these materials.…”

Magnetic and spectral properties of the multisublattice oxidesSrY2O4:Er3+andМалкин1, Nikitin2, Mumdzhi3 et al. 2015Phys. Rev. B341350View full textAdd to dashboardCite

“…A wide variety of unconventional magnetic properties observed in these compounds includes a coexistence of long-range antiferromagnetic and short-range incommensurate order in SrEr 2 O 4 [3,4], two types of short-range order in SrHo 2 O 4 [5][6][7], noncollinear order in SrYb 2 O 4 [8], incommensurate magnetic structure in SrTb 2 O 4 [9], and the absence of the longer-range magnetic correlations in SrDy 2 O 4 down to the lowest experimentally available temperatures [10]. To elucidate and model specific magnetic properties of these oxides, which can be described as geometrically frustrated multisublattice magnets with a quasione-dimensional space structure, it is necessary to establish the spectral properties of the magnetic subsystem formed by the RE ions.…”