Magnetoelastic properties of high-purity single-crystal terbium

Jiles, David; Palmer, S.B.; Jones, D W; Farrant, S.; Gschneidner, K. A.

doi:10.1088/0305-4608/14/12/027

Cited by 22 publications

(10 citation statements)

References 37 publications

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“…31 was T N = 226 K, i.e., 4 K below the accepted literature value, a fact that hints on the presence of a significant amount of impurities in the studied sample. 50 Different from the literature data, we do not observe an increase of ϕ in Tb at the smallest T , but a smooth decrease for temperatures below T C ∼ = 220 K. A magnetic Debye-Scherrer ring is clearly observed for coarse-grained Tb at T = 215 K [Figs. 2(c) and 3(b)].…”

Section: 3940contrasting

confidence: 99%

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

et al. 2011

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We report on the results of grain-size and temperature-dependent magnetization, specific-heat, and neutron-scattering experiments on the heavy rare-earth metals terbium and holmium, with particular emphasis on the temperature regions where the helical antiferromagnetic phases exist. In contrast to Ho, we find that the helical structure in Tb is relative strongly affected by microstructural disorder, specifically, it can no longer be detected for the smallest studied grain size of D = 18 nm. Moreover, in coarse-grained Tb a helical structure persists even in the ferromagnetic regime, down to about T = 215 K, in agreement with angle-resolved photoelectron spectroscopy (ARPES) data, which reveal a nesting feature of the bulk Fermi surface at the L point of the Brillouin zone at T = 210 K. As samples for the ARPES measurements, we used 10-nm-thick single-crystalline Tb films that show a bulk electronic valance-band structure. Thus, our ARPES measurements are used to discuss temperature-induced effects observed in the coarse-grained samples.

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Section: 3940contrasting

confidence: 99%

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

et al. 2011

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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: 67%

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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“…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: 93%

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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Magnetoelastic properties of high-purity single-crystal terbium

Cited by 22 publications

References 37 publications

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

Influence of crystallite size and temperature on the antiferromagnetic helices of terbium and holmium metal

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

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