Field dependence of the magnetic correlations of the frustrated magnetSrDy2O4

Abstract

The frustrated magnet SrDy 2 O 4 exhibits a field-induced phase with a magnetization plateau at 1/3 of the saturation value for magnetic fields applied along the b-axis. We report here a neutron scattering study of the nature and symmetry of the magnetic order in this field-induced phase. Below T ≈ 0.5 K, there are strong hysteretic effects, and the order is short or long ranged for zero-field and field cooling, respectively. We find that the long-range ordered magnetic structure within the zig-zag chains is identical to that expected for the one-dimensional axial next-nearest neighbour Ising (ANNNI) model in longitudinal fields. The long-range ordered structure in field contrasts with the short-range order found at zero field, and is probably reached through enhanced quantum fluctuations with increasing fields.

Fragile ground state and rigid field-induced structures in the zigzag ladder compound BaDy2O4

“…Figure 5 also provides a natural way to introduce more accurately the definitions of the intermediate-and high-field regions, the former being from 2.5 to 25 kOe and the latter above 25 kOe. [19,20] and SrEr 2 O 4 [29], as the zero-field ground state is restored when the applied field is ramped back down to zero after field excursions to 20 and 60 kOe.…”

“…The axial next-nearest-neighbor Ising (ANNNI) model [32,33] has been employed to describe the magnetic properties of SrHo 2 O 4 [13], SrDy 2 O 4 [17,20], and other members of the family. Although the model captures several features (including the uud state for longitudinal fields) and allows for the introduction of the effective exchange constants, it is as a minimal effective model in which the interactions between the ladders are ignored.…”

“…However, an up-up-down (uud) state with much longer correlations can be induced in SrDy 2 O 4 by a magnetic field applied along the b axis [16]. The field-induced magnetic ordering in SrDy 2 O 4 for H b is best seen in single-crystal calorimetry [18], ultrasound [19], and neutron diffraction [16,20] measurements, although, even in a polycrystalline neutron diffraction experiment [16], the powder-averaged signal is dominated by the sharp magnetic Bragg peaks formed on top of broad diffuse features seen in zero field. The uud states are characterized by a 1 3 -magnetization plateau and have also been observed in other compounds in the SrRE 2 O 4 family, such as SrEr 2 O 4 and SrHo 2 O 4 [21].…”

Super-Necking Crystal Growth and Structural and Magnetic Properties of SrTb2O4 Single Crystals

“… 21 One-third magnetization plateau was observed in the SrRE 2 O 4 (RE = Dy, Ho, Er) compounds. 19 , 20 , 22 No magnetic ordering was observed down to ∼65 mK for the SrTm 2 O 4 compound. 23 Upon cooling, the SrYb 2 O 4 single crystal undergoes a magnetic phase transition at T N ≈ 0.9 K, forming a long-range commensurate noncollinear AFM order with a reduction in the ordered moment.…”

Magnetic structure and low-temperature properties of geometrically frustrated SrNd2O4

“…This geometry, combined with the antiferromagnetic exchange interactions, results in a behavior typically associated with geometrical frustration, such as suppression of the magnetic ordering down to very low temperatures, complex and fragile ground states sensitive to minute perturbations, as well as the appearance of magnetization plateaus in an applied field. Previous studies of the SrLn 2 O 4 family mostly focused on the heavy rareearth members, such as SrGd 2 O 4 [2][3][4], SrDy 2 O 4 [5][6][7][8][9][10], SrHo 2 O 4 [11][12][13][14][15], SrEr 2 O 4 [13,[16][17][18][19][20], and SrYb 2 O 4 [21]. The magnetic properties of SrNd 2 O 4 containing a lighter lanthanide, Nd, have not yet been reported, although BaNd 2 O 4 and BaTb 2 O 4 have been investigated with magnetization, heat capacity, and powder neutron diffraction measurements [22,23].…”