Low-temperature magnetic properties of the monoclinic magnet RbDy(WO4)2

Abstract

The temperature dependence of the magnetic susceptibility along the principal magnetic axes of rubidium–dysprosium tungstate RbDy(WO4)2 is measured in the temperature interval 0.5–300 K. Strong anisotropy of the susceptibility is observed at all temperatures in that range. At TN=0.8 K the susceptibility along all three magnetic axes exhibits a sharp anomaly due to the phase transition to a magnetically ordered state. At 0.5 K the measured field dependence of the magnetization along all three axes demonstrates a metamagnetic orientational phase transition in the directions of the magnetic axes y and z. Another type of anomaly of the magnetic susceptibility is observed at temperatures of around 5, 8, and 50 K. Analysis shows that these anomalies correspond to structural phase transitions in this compound.

Top seeded solution growth of KHo(WO4)2 single crystals

“…The plates had three orientations perpendicular to xy; xz or yz planes. 12 (16) 130.720(49) [21] The low symmetry of KHo(WO 4 ) 2 crystals results in anisotropy of physical properties (for example, mechanical anisotropy observed in the processes of cutting and polishing of single crystals). Optical investigations indicate that optical absorption and refraction properties are also strongly anisotropic.…”

“…At sub-Kelvin temperatures, magnetic phase transitions were also observed [5]. At this time, this interesting structural and magnetic behavior at low temperature was found for rare-earth-containing double tungstates such as KDy(WO 4 ) 2 [7][8][9], RbDy(WO 4 ) 2 [10][11][12], CsDy(WO 4 ) 2 [13][14][15], KEr (WO 4 ) 2 [16][17][18][19], and RbNd(WO 4 ) 2 [20].…”

The low temperature magnetic properties of potassium holmium double tungstate

“…The temperature dependences of magnetic susceptibility of KHo(WO 4 ) 2 compound were investigated over the temperature range of 5 -100 K in magnetic fields up to 1.5 T by means of a vibrating magnetometer. Temperatures from 5 K down to 1.8 K were obtained by pumping of He 4 , and further low temperatures down to 0.5 K -by pumping of He 3 . Since the crystal belongss to the monoclinic system, not all of its magnetic axes have to coincide with the crystallographic axes.…”

“…They are characterized by a strong magnetic anisotropy, low local symmetry, lowdimensional magnetic structure and exhibit strong spinlattice coupling [1][2][3][4][5][6][7][8][9]. The unusual physical properties of RE double tungstates are attributed by the partly filled 4 -electron shell of rare earth ions [10,11].…”

The specific heat of potassium holmium double tungstate

“…RE double tungstates containing the Dy and Er ions are the most intensively studied crystals, in which the lowest energy levels are Kramer's doublets [1,[5][6][7][8]. The magnetism of RE double tungstates results from the competition between spin-spin, dipole-dipole and magnetoelastic interactions.…”