A cluster-glass magnetic state in R₅Pd₂(R = Ho, Tb) compounds evidenced by AC-susceptibility and neutron scattering measurements

Abstract

AC- and DC-susceptibility, high-field magnetization and neutron diffraction measurements have been performed in order to study the magnetic state of R5Pd2 (R = Ho, Tb) compounds. The results show that both compounds undergo cluster-glass freezing upon cooling below Tf. According to the neutron diffraction a long-range magnetic order is absent down to 2 K and magnetic clusters with short-range incommensurate antiferromagnetic correlations exist not only below Tf but also in a wide temperature range above the freezing temperature (at least up to 2Tf). A complex cluster-glass magnetic state existing in Ho5Pd2 and Tb5Pd2 down to low temperatures results in rather complicated magnetization behavior in DC and AC magnetic fields. Such an unusual magnetic state in compounds with a high rare-earth concentration may be associated with the layered type of their crystal structure and with substantial atomic disorder, which results in frustrations in the magnetic subsystem.

Nature of glassy magnetic state in magnetocaloric materials Dy5Pd2-xNix (x = 0 and 1) and universal scaling analysis of R5Pd2 (R = Tb, Dy and Er)

“…in the temperature range of measurement. These results also supported the presence of glasslike behaviour in these compounds which were also in accordance to the results obtained for other R 5 Pd 2 members [14,[19][20].…”

“…In order to further understand the magnetic nature of compound, magnetic isotherms as a function of applied field (in the range ±70 kOe) at different temperatures (2-100 K) were measured and the resulting curves are shown in Figure 2 whereas the presence of later property is an indication of the existence of ferromagnetic component, implying that multiple interactions were present in these compounds. Similar behaviour had also been reported in literature for other compounds [20]. Additionally coercive field was found to decrease exponentially with increasing the temperature for both the compounds (lower inset Figure 2(b)).…”

Ba(Zn1−2xMnxCux)2As2: A Bulk Form Diluted Ferromagnetic Semiconductor with Mn and Cu Codoping at Zn Sites

“…The value of η falls into the range of 4–12 for spin glasses31323336404445, which is not cluster-glass like character46. is close to 7.9, the calculated value for the three-dimensional Ising spin-glass4748.…”

Complex magnetic behaviour and evidence of a superspin glass state in the binary intermetallic compound Er5Pd2

“…This group of spins along with strong anisotropy of Er ions on application of magnetic field can make the system highly irreversible and can lead to deviation from A-T line [29]. For R 5 Pd 2 , p is seen to be different for different members of the family [14], as different rare-earths show different anisotropic behaviour in the applied magnetic field [29]. But, as reported by Wegner and Mydosh [30], such A-T phase boundary cannot be considered as an exact proof of glass-like phase transition.…”

“…Hence these compounds can be categorized to the family 3 where origin of glassy behaviour is not due to geometrical frustration or structural disorder. Klimczak et al, reported that the compound Er 5 Pd 2 orders magnetically and shows spin reorientation [17] whereas Gubkin et al, suggested that the members of R 5 Pd 2 family may have a glassy magnetic state at low temperature [14]. However, a detailed study about the compound Er 5 Pd 2 is lacking in literature.…”