Magnetic and magnetothermal properties, and the magnetic phase diagram of single-crystal holmium along the easy magnetization direction

Zverev, V. I.; Tishin, A.M.; Zou, Min; Mudryk, Yaroslav; Gschneidner, K. A.; Pecharsky, V. K.

doi:10.1088/0953-8984/27/14/146002

Cited by 25 publications

(24 citation statements)

References 21 publications

(41 reference statements)

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“…1, as shown in Fig. 1(d) for Dy and experimentally observed for Tb [35][36][37][38] , Dy [39][40][41] , and Ho 42,43 . In the absence of a magnetic field the PM state of these lanthanide metals becomes unstable to the formation of a helical antiferromagnetic (HAFM) ordering through a second-order transition at T N .…”

Section: The Magnetocaloric Effect In the Heavy Rare Earth Elementssupporting

confidence: 69%

Caloric effects around phase transitions in magnetic materials described by ab initio theory: The electronic glue and fluctuating local moments

Mendive-Tapia

Staunton

2020

Journal of Applied Physics

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We describe magneto-, baro-and elastocaloric effects (MCEs, BCEs and eCEs) in materials which possess both discontinuous (first-order) and continuous (second-order) magnetic phase transitions. Our ab initio theory of the interacting electrons of materials in terms of disordered local moments (DLMs) has produced explicit mechanisms for the drivers of these transitions and here we study associated caloric effects in three case studies where both types of transition are evident. Our earlier work had described FeRh's magnetic phase diagram and large MCE. Here we present calculations of its substantial BCE and eCE. We describe the MCE of dysprosium and find very good agreement with experimental values for isothermal entropy (∆S iso ) and adiabatic temperature (∆T ad ) changes over a large temperature span and different applied magnetic field values. We examine the conditions for optimal values of both ∆S iso and ∆T ad that comply with a Clausius-Clapeyron analysis, which we use to propose a promising elastocaloric cooling cycle arising from the unusual dependence of the entropy on temperature and biaxial strain found in our third case study -the Mn 3 GaN antiperovskite. We explain how both ∆S iso and ∆T ad can be kept large by exploiting the complex tensile strain-temperature magnetic phase diagram which we had earlier predicted for this material and also propose that hysteresis effects will be absent from half the caloric cycle. This rich and complex behavior stems from the frustrated nature of the interactions among the Mn local moments. arXiv:2005.12670v1 [cond-mat.mtrl-sci] 26 May 2020

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Section: The Magnetocaloric Effect In the Heavy Rare Earth Elementssupporting

confidence: 69%

Caloric effects around phase transitions in magnetic materials described by ab initio theory: The electronic glue and fluctuating local moments

Mendive-Tapia

Staunton

2020

Journal of Applied Physics

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“…Below its T c Gd preserves its FM order as the strength of the magnetic field applied along its easy axis is increased. This is in sharp contrast to Tb [3,[11][12][13], Dy [4][5][6][7]14] and Ho [8,10] above T t , which first distort their HAFM order (dis-HAFM) before undergoing a first order transition into a fan magnetic structure followed by a second order transition to a FM state with further increase in the magnetic field. Dy and Ho also exhibit signs of additional spin-flip and vortex transitions associated with subtle changes in measured magnetization curves.…”

mentioning

confidence: 94%

Theory of Magnetic Ordering in the Heavy Rare Earths:Ab InitioElectronic Origin of Pair- and Four-Spin Interactions

Mendive-Tapia

Staunton

2017

Phys. Rev. Lett.

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We describe a disordered local moment theory for long-period magnetic phases and investigate the temperature and magnetic field dependence of the magnetic states in the heavy rare earth elements (HREs), namely, paramagnetic, conical and helical antiferromagnetic (HAFM), fan, and ferromagnetic (FM) states. We obtain a generic HRE magnetic phase diagram which is consequent on the response of the common HRE valence electronic structure to f-electron magnetic moment ordering. The theory directly links the first-order HAFM-FM transition to the loss of Fermi surface nesting, induced by this magnetic ordering, as well as provides a template for analyzing the other phases and exposing where f-electron correlation effects are particularly intricate. Gadolinium, for a range of hexagonal, close-packed lattice constants c and a, is the prototype, described ab initio, and applications to other HREs are made straightforwardly by scaling the effective pair and quartic local moment interactions that emerge naturally from the theory with de Gennes factors and choosing appropriate lanthanide-contracted c and a values.

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“…Real magnetic materials have complicated interactions; there are large families of frustrated systems, such as the heavy lanthanides metals (holmium, terbium, and dysprosium) [34,35] and helical MnSi [36]. Other interesting properties of skyrmions in magnetically frustrated systems have also been investigated [31,[37][38][39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Skyrmion Crystals and Phase Transitions in Magneto-Ferroelectric Superlattices: Dzyaloshinskii–Moriya Interaction in a Frustrated J1 − J2 Model

Sharafullin

Diep

2019

Symmetry

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The formation of a skyrmion crystal and its phase transition are studied, taking into account the Dzyaloshinskii-Moriya (DM) interaction at the interface between a ferroelectric layer and a magnetic layer in a superlattice. Frustration is introduced in both magnetic and ferroelectric films. The films have a simple cubic lattice structure. The spins inside the magnetic layers are Heisenberg spins interacting with each other via nearest-neighbor (NN) exchange J m and next-nearest-neighbor (NNN) exchange J 2m . The polarizations in the ferroelectric layers are assumed to be of Ising type with NN and NNN interactions J f and J 2 f . At the magnetoelectric interface, a DM interaction J m f between spins and polarizations is supposed. The spin configuration in the ground state is calculated by the steepest descent method. In an applied magnetic field H perpendicular to the layers, we show that the formation of skyrmions at the magnetoelectric interface is strongly enhanced by the frustration brought about by the NNN antiferromagnetic interactions J 2m and J 2 f . Various physical quantities at finite temperatures are obtained by Monte Carlo simulations. We show the critical temperature, the order parameters of magnetic and ferroelectric layers as functions of the interface DM coupling, the applied magnetic field, and J 2m and J 2 f . The phase transition to the disordered phase is studied in detail.

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Magnetic and magnetothermal properties, and the magnetic phase diagram of single-crystal holmium along the easy magnetization direction

Cited by 25 publications

References 21 publications

Caloric effects around phase transitions in magnetic materials described by ab initio theory: The electronic glue and fluctuating local moments

Caloric effects around phase transitions in magnetic materials described by ab initio theory: The electronic glue and fluctuating local moments

Theory of Magnetic Ordering in the Heavy Rare Earths:Ab InitioElectronic Origin of Pair- and Four-Spin Interactions

Skyrmion Crystals and Phase Transitions in Magneto-Ferroelectric Superlattices: Dzyaloshinskii–Moriya Interaction in a Frustrated J1 − J2 Model

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