Ferromagnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Zr</mml:mi><mml:msub><mml:mi mathvariant="normal">Zn</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Yelland, E. A.; Yates, S. J. C.; Taylor, OJ; Griffiths, A.; Hayden, Stephen M; Carrington, A.

doi:10.1103/physrevb.72.184436

Cited by 66 publications

(66 citation statements)

References 53 publications

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“…For example, the value of ∆T G in itinerant ferromagnet ZrZn 2 with the spontaneous magnetic moment µ s = 0.16 µ B /f.u. and the magnetic correlation length ξ 0 = 33Å was estimated as ∆T G = 0.4 mK [42,43]. The experimentally determined critical exponents in the temperature range t = |(T − T C )/T C | < 0.1 are of the mean field type.…”

Section: Discussionmentioning

confidence: 98%

Unconventional critical scaling of magnetization in ferromagnetic uranium superconductorsUGe2and URhGe

et al. 2014

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We report a dc magnetization study of the critical phenomenon around the ferromagnetic transition temperature TC in high-quality single crystals of uranium ferromagnetic superconductors UGe2 and URhGe. The critical exponents, β for the temperature dependence of the magnetization below TC, γ for the magnetic susceptibility, and δ for the magnetic isothermal at TC have been determined with a modified Arrott plot, a Kouvel-Fisher plot, and the scaling analysis. Magnetization in the ferromagnetic state has strong uniaxial magnetic anisotropy in the two compounds. However, the universality class of the critical phenomena do not belong to the three dimensional (3D) Ising system. Although the values of β in UGe2 and URhGe are close to those in the 3D magnets, the values of γ are close to unity, that expected from the mean field theory. Similar critical exponents have been reported previously for the 3D Ising ferromagnet UIr where superconductivity appears under high pressure. The critical behavior may be limited to a very narrow Ginzburg critical region of ∆TG ∼ 1 mK because of the strong itinerant character of the 5f electrons in the ferromagnetic superconductor UCoGe where the mean field behavior of the magnetization has been reported. The unconventional critical scaling of magnetization in UGe2, URhGe and UIr cannot be explained via previous approaches to critical phenomena. The ferromagnetic correlation between the 5f electrons differs from that in the 3D Ising system and this difference may be a key point for the understanding of the ferromagnetism where superconductivity emerges.

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Section: Discussionmentioning

confidence: 98%

Unconventional critical scaling of magnetization in ferromagnetic uranium superconductorsUGe2and URhGe

et al. 2014

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“…This is certainly in agreement with the thermodynamically determined entropy of ordering ÁS at T SDW which, in the systems where high temperature specific heat data exist, is relatively small compared to that expected for full local moment ordering (5:76 J=mole K or R ln2 of entropy for a spin 1=2 local moment.) On the other hand, for a fully itinerant magnetic moment, there would be essentially no entropy of ordering at the transition temperature as is observed, e.g., in the itinerant ferromagnet ZrZn 2 , where ÁS $ 0:02 J=mole K (Yelland et al, 2005). Values for ÁS at T SDW for BaFe 2 As 2 (Ba 0:8 K 0:2 Fe 2 As 2 ), SrFe 2 As 2 , EuFe 2 As 2 , and Fe 1:1 Te (obtained by analyzing the published specific heat data) are respectively 0.85 ð0:18 J=mole KÞ (Kant et al, 2010), % 1 J=mole K , 1:5 J=mole K (Jeevan et al, 2008a), and 2:4 J=mole K (Westrum, Chou, and Gronvold, 1959).…”

Section: B T C T S and T Sdw Versus Doping And Phase Diagramsmentioning

confidence: 92%

Superconductivity in iron compounds

2011

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Kamihara and coworkers' report of superconductivity at T c ¼ 26 K in fluorine-doped LaFeAsO inspired a worldwide effort to understand the nature of the superconductivity in this new class of compounds. These iron pnictide and chalcogenide (FePn/Ch) superconductors have Fe electrons at the Fermi surface, plus an unusual Fermiology that can change rapidly with doping, which lead to normal and superconducting state properties very different from those in standard electron-phonon coupled ''conventional'' superconductors. Clearly, superconductivity and magnetism or magnetic fluctuations are intimately related in the FePn/Ch, and even coexist in some. Open questions, including the superconducting nodal structure in a number of compounds, abound and are often dependent on improved sample quality for their solution. With T c values up to 56 K, the six distinct Fe-containing superconducting structures exhibit complex but often comparable behaviors. The search for correlations and explanations in this fascinating field of research would benefit from an organization of the large, seemingly disparate data set. This review provides an overview, using numerous references, with a focus on the materials and their superconductivity.

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“…In addition Ce 3 Al 11 and CeSb were studied as examples of multiple, temperature and field dependent transitions in local moment systems. Whereas each of these compounds are interesting in their own right [5,11,12,[15][16][17][18] they are being used in this study as bench marks.…”

Section: Samplesmentioning

confidence: 99%

Precise measurements of radio-frequency magnetic susceptibility in ferromagnetic and antiferromagnetic materials

Vannette

Sefat

Jia

et al. 2008

Journal of Magnetism and Magnetic Materials

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Dynamic magnetic susceptibility, w, was studied in several intermetallic materials exhibiting ferromagnetic, antiferromagnetic and metamagnetic transitions. Precise measurements by using a 14 MHz tunnel diode oscillator (TDO) allow detailed insight into the field and temperature dependence of w. In particular, local moment ferromagnets show a sharp peak in wðTÞ near the Curie temperature, T C . The peak amplitude decreases and shifts to higher temperatures with very small applied dc fields. Anisotropic measurements of CeVSb 3 show that this peak is present provided the magnetic easy axis is aligned with the excitation field. In a striking contrast, small moment, itinerant ferromagnets (i.e., ZrZn 2 ) show a broad maximum in wðTÞ that responds differently to applied field. We believe that TDO measurements provide a very sensitive way to distinguish between local and itinerant moment magnetic orders. Local moment antiferromagnets do not show a peak at the Ne´el temperature, T N , but only a sharp decrease of w below T N due to the loss of spindisorder scattering changing the penetration depth of the ac excitation field. Furthermore, we show that the TDO is capable of detecting changes in spin order as well as metamagnetic transitions. Finally, critical scaling of wðT; HÞ in the vicinity of T C is discussed in CeVSb 3 and CeAgSb 2 .

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Ferromagnetic properties ofZrZn2

Cited by 66 publications

References 53 publications

Unconventional critical scaling of magnetization in ferromagnetic uranium superconductorsUGe2and URhGe

Unconventional critical scaling of magnetization in ferromagnetic uranium superconductorsUGe2and URhGe

Superconductivity in iron compounds

Precise measurements of radio-frequency magnetic susceptibility in ferromagnetic and antiferromagnetic materials

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