Thermal expansion anomalies in dysprosium

Amitin, E. B.; Bessergenev, V G; Kovalevskaya, Yu. A.

doi:10.1088/0305-4608/14/12/015

Cited by 13 publications

(3 citation statements)

References 13 publications

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“…We now discuss possible structural origins of in polycrystalline Dy. Firstly, the helical AFM state shows negative thermal expansion along the hexagonal axis 37 , 38 and positive thermal expansion in the basal plane 37 . Temperature changes are then expected to provoke significant variations of exchange energies and change the pitch of the helical structure 39 .…”

Section: Discussionmentioning

confidence: 99%

Temperature Chaos, Memory Effect, and Domain Fluctuations in the Spiral Antiferromagnet Dy

Kustov

Liubimova

Corró

et al. 2019

Sci Rep

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The spiral antiferromagnetic phase of polycrystalline dysprosium between 140 K and the Néel temperature at 178 K and its domain wall (DW) dynamics were investigated using high-resolution ultrasonic spectroscopy. Two kinetic processes of quasi-static DW motion occur under non-isothermal and isothermal conditions. A “fast” process is proportional to the rate of the temperature change and results in a new category of anelastic phenomena: magnetic transient ultrasonic internal friction (IF). This IF, related to fast moving magnetic DWs, decays rapidly after interruptions of cooling/heating cycles. A second, “slow” kinetic process is seen as logarithmic IF relaxation under isothermal conditions. This second process is glass-like and results in memory and temperature chaos effects. Low-frequency thermal fluctuations of DWs, previously detected by X-ray photon correlation spectroscopy, are related to critical fluctuations with Brownian motion-like dynamics of DWs.

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Section: Discussionmentioning

confidence: 99%

Temperature Chaos, Memory Effect, and Domain Fluctuations in the Spiral Antiferromagnet Dy

Kustov

Liubimova

Corró

et al. 2019

Sci Rep

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“…Thermal expansion 11,12 and heat capacity 13 measured in a zero magnetic field reveal additional anomalies, such as steps and sudden slope changes, which were explained by temperature-dependent changes in the commensurability between the magnetic and crystallographic lattices. The correspondence between the anomalies and commensurability points was considered by Greenough et al 14 with the objective to understand the nature of the complex temperature dependence of the thermal expansion and elastic constants in a zero magnetic field, and to relate the changes of the magnetic structure studied by neutron scattering with the elastic properties of Dy.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and magnetocaloric properties and the magnetic phase diagram of single-crystal dysprosium

et al. 2005

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Magnetic materials exhibiting magnetic phase transitions simultaneously with structural rearrangements of their crystalline lattices hold promise for numerous practical applications including magnetic refrigeration, magnetomechanical devices, and sensors. We undertook a detailed study of a single crystal of dysprosium metal, which is a classical example of a system where magnetic and crystallographic sublattices can be either coupled or decoupled from one another. Magnetocaloric effect, magnetization, ac magnetic susceptibility, and heat capacity of high-purity single crystals of dysprosium have been investigated over broad temperature and magnetic field intervals with the magnetic field vector parallel to either the a or c axes of the crystal. Notable differences in the behavior of the physical properties when compared to Dy samples studied in the past have been observed between 110 and 125 K, and between 178 and ϳ210 K. A plausible mechanism based on the formation of antiferromagnetic clusters in the impure Dy has been suggested in order to explain the reduction of the magnetocaloric effect in the vicinity of the Néel point of relatively impure samples. Experimental and theoretical investigations of the influence of commensurability effects on the magnetic phase diagram and the value of the magnetocaloric effect have been conducted. The presence of newly found anomalies in the physical properties has been considered as evidence of previously unreported states of Dy. The refined magnetic phase diagram of dysprosium with the magnetic field vector parallel to the a axis of a crystal has been constructed and discussed.FIG. 26. ͑Color online͒ The temperature dependencies of the magnetocaloric effect of Dy as calculated from the heat capacity data.

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“…For instance, normal Hall effect measurements seem to show that the effective number of conduction electrons does not vary linearly with the magnetization but as its square. 17 Resistivity data obtained for thulium single crystals have also suggested below T N an important reduction of the Fermi surface area which would be quadratic in the magnetization rather than linear. 18 Such a variation of the Fermi surface has been suggested by Miwa.…”

Section: Resultsmentioning

confidence: 99%

Resistivity of RMn12−xFex alloys

Stankiewicz

Bartolomé

Morales

et al. 2001

Journal of Applied Physics

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The electrical resistivity of RMn 12Ϫx Fe x ͑RϭEr,Ho͒ polycrystalline system with xϭ0, 4, 5, and 6 was measured over the temperature range of 4 to 300 K. The resistivity increases sharply near the Ne ´el temperature T N for xϭ4, 5, and 6 which, according to existing theories, can be ascribed to the formation of superzone gaps. Then, the resistivity increase should be proportional to the staggered magnetization mЈ below T N , whereas we find experimentally that it is quadratic in mЈ. Thermal smearing of the gaps can lead to such a dependence. There is no evidence for superzone effects in xϭ0 compounds. A combination of spin disorder, phonon, and impurity scattering gives a good account for the experimental data.

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Thermal expansion anomalies in dysprosium

Cited by 13 publications

References 13 publications

Temperature Chaos, Memory Effect, and Domain Fluctuations in the Spiral Antiferromagnet Dy

Temperature Chaos, Memory Effect, and Domain Fluctuations in the Spiral Antiferromagnet Dy

Magnetic and magnetocaloric properties and the magnetic phase diagram of single-crystal dysprosium

Resistivity of RMn12−xFex alloys

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