Extremely slow nonequilibrium monopole dynamics in classical spin ice

Stöter, T.; Doerr, M.; Granovsky, S.A.; Rotter, Martin; Goennenwein, Sebastian T. B.; Жерлицын, С.; Petrenko, O. A.; Zhou, H. D.; Wosnitza, J.

doi:10.1103/physrevb.101.224416

Cited by 9 publications

(11 citation statements)

References 56 publications

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“…The broad peak feature is similar to previous low-frequency susceptibility measurements [7,16,19,20] which is related to 2-2 to 3-1 spin flip transition. As T → 0, the increase of susceptibility in almost all the curves in the figure bears similarity to the heat capacity data [10] whose nature has been suggested to be related to the onset of phase transition to its (long-range ordered) ground state [10], Schottky-type peak due to multitude of local orders [11], the dynamics of spin monopoles [17,18], or the presence of other spin relaxation channels [42,43].…”

Section: Resultssupporting

confidence: 52%

“…At T < 1 K, most of the relaxation channels "freeze" out and the relaxation time scale grows exponentially on cooling. The possible dynamics of magnetic monopoles in this part of the phase diagram is an interesting suggestion, which has recently started to be explored experimentally [17,18]. The second peak in AC susceptibility measurements exhibits strong temperature dependence, from ∼0 K (DC) to 20 K (10 kHz AC) [16,19,7,20].…”

Section: Introductionmentioning

confidence: 98%

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Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy$_2$Ti$_2$O$_7$

Teknowijoyo,

Cho,

Timmons

et al. 2021

Preprint

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MHz) AC magnetic susceptibility, χ AC , of Dy 2 Ti 2 O 7 was measured using self-oscillating tunnel-diode resonator. Measurements were made with the excitation AC field parallel to the superimposed DC magnetic field up 5 T in a wide temperature range from 50 mK to 100 K. At 14.6 MHz a known broad peak of χ AC (T ) from kHz -range audiofrequency measurements around 15 K for both [111] and [110] directions shifts to 45 K, continuing the Arrhenius activated behavior with the same activation energy barrier of Ea ≈ 230 K. Magnetic field dependence of χ AC along [111] reproduces previously reported low-temperature two-in-two-out to three-in-oneout spin configuration transition at about 1 T, and an intermediate phase between 1 and 1.5 T. The boundaries of the intermediate phase show reasonable overlap with the literature data and connect at a critical endpoint of the first order transition line, suggesting that these low-temperature features are frequency independent. An unusual upturn of magnetic susceptibility at T → 0 was observed in magnetic fields between 1.5 T and 2 T for both magnetic field directions, before fully polarized configuration sets in above 2 T.

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Section: Resultssupporting

confidence: 52%

Section: Introductionmentioning

confidence: 98%

Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy$_2$Ti$_2$O$_7$

Teknowijoyo,

Cho,

Timmons

et al. 2021

Preprint

View full text Add to dashboard Cite

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“…There has been a great number of experimental and theoretical studies on the dynamics of spin ices [6,7,8,19,20,22,24,26,27,28,29,30,31,32,33,34,35,36]. However, excluding works on field quenches [9,37], the characterisation of the dynamics of single crystals in an applied field and at low temperatures (well within the spin-ice regime), is much more scarce [10,12,14,38,39,40,41,42], and has left a number of questions unanswered. Among others, one aspect we investigate in this work is the dependence of the blocking temperature (the temperature at which the magnetic system starts to fall out of equilibrium within the time scale of a given experiment) with magnetic field, and in particular with the field orientation with respect to the crystalline axis.…”

Section: Introductionmentioning

confidence: 99%

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy₂Ti₂O₇ under moderate magnetic fields

Guruciaga¹,

Pili²,

Boyeras³

et al. 2020

J. Phys.: Condens. Matter

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We study experimentally and numerically the dynamics of the spin ice material Dy 2 Ti 2 O 7 in the low temperature (T ) and moderate magnetic field (B) regime (T ∈ [0.1, 1.7] K, B ∈ [0, 0.3] T). Our objective is to understand the main physics shaping the out-of-equilibrium magnetisation vs. temperature curves in two different regimes. Very far from equilibrium, turning on the magnetic field after having cooled the system in zero field (ZFC) can increase the concentration of magnetic monopoles (localised thermal excitations present in these systems); this accelerates the dynamics. Similarly to electrolytes, this occurs through dissociation of bound monopole pairs. However, for spin ices the polarisation of the vacuum out of which the monopole pairs are created is a key factor shaping the magnetisation curves, with no analog. We observe a threshold field near 0.2 T for this fast dynamics to take place, linked to the maximum magnetic force between the attracting pairs. Surprisingly, within a regime of low temperatures and moderate fields, an extended Ohm's law can be used to describe the ZFC magnetisation curve obtained with the dipolar spinice model. However, in real samples the acceleration of the dynamics appears even sharper than in simulations, possibly due to the presence of avalanches. On the other hand, the effect of the field nearer equilibrium can be just the opposite to that at very low temperatures. Single crystals, as noted before for powders, abandon equilibrium at a blocking temperature T B which increases with field. Curiously, this behaviour is present in numerical simulations even within the nearest-neighbours interactions model. Simulations and experiments show that the increasing trend in T B is stronger

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“…There has been a great number of experimental and theoretical studies on the dynamics of spin ices [6,7,8,19,20,22,24,26,27,28,29,30,31,32,33,34,35,36]. However, excluding works on field quenches [9,37], the characterisation of the dynamics of single crystals in an applied field and at low temperatures (well within the spin-ice regime), is much more scarce [10,12,14,38,39,40,41,42], and has left a number of questions unanswered. Among others, one aspect we investigate in this work is the dependence of the blocking temperature T B (the temperature at which the magnetic system starts to fall out of equilibrium within the time scale of a given experiment) with magnetic field, and in particular with the field orientation with respect to the crystalline axis.…”

Section: Introductionmentioning

confidence: 99%

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy$_2$Ti$_2$O$_7$ under moderate magnetic fields

Guruciaga,

Pili,

Boyeras

et al. 2020

Preprint

View full text Add to dashboard Cite

We study experimentally and numerically the dynamics of the spin ice material Dy 2 Ti 2 O 7 in the low temperature (T ) and moderate magnetic field (B) regime (T ∈ [0.1, 1.7] K, B ∈ [0, 0.3] T). One of our objectives is to understand the main physics shaping the out-of-equilibrium magnetisation vs. temperature curves. We find that single crystals, as noted before for powdered samples, tend to abandon equilibrium at a blocking temperature T B which increases with applied field. Curiously, this behaviour is present even within the nearest-neighbours interactions model. Simulations and ac-susceptibility experiments show that the increasing trend in T B is stronger for fields applied along [100]. This suggests that the field plays a part in the dynamical arrest through the suppression of magnetic monopoles (localised thermal excitations present in these spin systems), which is quite manifest for this field orientation. On the other hand, very far from equilibrium the effect of B can be the inverse one: turning on the magnetic field after having cooled the system in zero field can increase the monopole concentration through dissociation of bound monopole pairs, thus accelerating the dynamics. The process is similar to that observed in electrolytes. However, for spin ices the polarisation state of the vacuum out of which the monopole pairs are created is a key factor shaping the magnetisation curves that has no analog in the electric case. We observe a threshold field near 0.2 T for this fast dynamics to take place; it is linked to the maximum magnetic force possible between the attracting pair. Surprisingly, within a regime of low temperatures and moderate fields, an extended Ohm's law can be used to describe the zero-field-cooled magnetisation curve obtained

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Extremely slow nonequilibrium monopole dynamics in classical spin ice

Cited by 9 publications

References 56 publications

Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy$_2$Ti$_2$O$_7$

Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy$_2$Ti$_2$O$_7$

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy₂Ti₂O₇ under moderate magnetic fields

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy$_2$Ti$_2$O$_7$ under moderate magnetic fields

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Extremely slow nonequilibrium monopole dynamics in classical spin ice

Cited by 9 publications

References 56 publications

Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy$_2$Ti$_2$O$_7$

Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy$_2$Ti$_2$O$_7$

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy2Ti2O7 under moderate magnetic fields

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy$_2$Ti$_2$O$_7$ under moderate magnetic fields

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Product

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About

Anomalous out-of-equilibrium dynamics in the spin-ice material Dy₂Ti₂O₇ under moderate magnetic fields