Magnetic properties of U(Ru1−xRhx)2Si2 single crystals (0≤x≤1)

Miyako, Y.; Kawarazaki, S.; Arima, Hiroshi; Paulsen, C.; Hasselbach, K.

doi:10.1063/1.350162

Cited by 48 publications

(33 citation statements)

References 11 publications

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“…They can be classified into two groups depending on whether the order parameter (OP) is (A) a magnetic dipole m [12][13][14][15][16][17] or (B) some other degree of freedom c [18][19][20][21][22][23][24][25][26][27][28][29]. In the former group, the AF order is regarded as intrinsic and the models involve a mechanism for decreasing the effective g value to account for the difference between m o and DS.…”

Section: Introductionmentioning

confidence: 99%

Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

Arima

Matsuda

Kawasaki

et al. 2007

Journal of Magnetism and Magnetic Materials

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192

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Section: Introductionmentioning

confidence: 99%

Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

Arima

Matsuda

Kawasaki

et al. 2007

Journal of Magnetism and Magnetic Materials

Self Cite

166

192

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“…In the Rh case, in addition to the HO phase, there are two other nominally antiferromagnetic (AFM) phases, which are separated by nonmagnetic regions [7]. In contrast to the HO, these AFM phases are characterized by a larger moment [8,9], and a complex magnetic structure exists at intermediate Rh concentrations [10].…”

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confidence: 99%

The suppression of hidden order and the onset of ferromagnetism in URu₂Si₂via Re substitution

Butch¹,

Maple²

2010

J. Phys.: Condens. Matter

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Abstract. Substitution of Re for Ru in the heavy fermion compound URu 2 Si 2 suppresses the hidden order transition and gives rise to ferromagnetism at higher concentrations. The hidden order transition of URu 2−x Re x Si 2 , tracked via specific heat and electrical resistivity measurements, decreases in temperature and broadens, and is no longer observed for x > 0.1. A critical scaling analysis of the bulk magnetization indicates that the ferromagnetic ordering temperature and ordered moment are suppressed continuously towards zero at a critical concentration of x ≈ 0.15, accompanied by the additional suppression of the critical exponents γ and δ − 1 towards zero. This unusual trend appears to reflect the underlying interplay between Kondo and ferromagnetic interactions, and perhaps the proximity of the hidden order phase.PACS numbers: 71.27.+a,75.40.Cx,75.60.Ej ‡ Present address: University of Maryland, College Park, MD 20742 2 For well over two decades, the identity of the ordered phase found in URu 2 Si 2 at temperatures below 17 K has eluded researchers. This hidden order (HO) phase coexists with a heavy fermion state, but yields to a superconducting ground state below 1.5 K. In order to develop a better understanding of the HO phase, URu 2 Si 2 has been extensively studied by various techniques, and these efforts have uncovered fascinating behavior under magnetic field, applied pressure, and chemical substitution. We describe the novel phase changes induced by Re substitution for Ru, including the suppression of the HO transition, the nearby emergence of ferromagnetic (FM) order, and the unique critical behavior of this phase.Chemical substitution studies have been used primarily to investigate the robustness of the HO phase, and substitutions have been made for all three elements in URu 2 Si 2 . Replacing U with Th or rare earths quickly suppresses the HO transition temperature [1,2], emphasizing the critical role of the U f -electrons to the HO phase. In contrast, substitution for Si has no dramatic effects [3]. Most of the neighboring elements of Ru: Mn, Tc, Th, Re, Os, Rh, and Ir have been substituted onto the Ru site, and in all cases except Os, the HO transition is suppressed by about 5% substituent concentration [4,5,6].For a few elements, the phase diagrams at higher concentrations have been studied. In the Rh case, in addition to the HO phase, there are two other nominally antiferromagnetic (AFM) phases, which are separated by nonmagnetic regions [7]. In contrast to the HO, these AFM phases are characterized by a larger moment [8,9], and a complex magnetic structure exists at intermediate Rh concentrations [10]. A closer examination of the HO phase found that for almost half of the range of Rh concentration over which the HO phase exists, the order is actually AFM [11].Substituting into URu 2 Si 2 with Re, Tc, or Mn leads instead to ferromagnetic (FM) order [6], whose discovery constituted the first experimental realization of a heavy fermion FM instability. In URu 2−x Re x Si 2 , a maximum T C ≈ ...

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“…They can be classified into two groups depending on whether the order parameter (OP) is (A) a magnetic dipole m [12,13,14,15,16,17] or (B) some other degree of freedom ψ [18,19,20,21,22,23,24,25,26,27,28,29]. In the former group, the AF order is regarded as intrinsic and the models involve a mechanism for decreasing the effective g value to account for the difference between µ o and ∆S.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic instability at the edge of intermediate valence

Sereni

Caroca‐Canales

Geibel

2007

Journal of Magnetism and Magnetic Materials

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The pressure-temperature phase diagram of the heavy-electron superconductor URu2Si2 has been reinvestigated by ac-susceptibility and elastic neutron-scattering (NS) measurements performed on a small single-crystalline rod (2 mm in diameter, 6 mm in length) in a Cu-Be clamp-type high-pressure cell (P < 1.1 GPa). At ambient pressure, this sample shows the weakest antiferromagnetic (AF) Bragg reflections reported so far, corresponding to the volume-averaged staggered moment of µo∼ 0.011 µB/U. Under applied pressure, the AF scattering intensity exhibits a sharp increase at P ∼ 0.7 GPa at low temperatures. The saturation value of the AF scattering intensity above 0.7 GPa corresponds to µo ∼ 0.41 µB/U, which is in good agreement with that (∼ 0.39µB/U) observed above 1.5 GPa in our previous NS measurements. The superconductivity is dramatically suppressed by the evolution of AF phase, indicating that the superconducting state coexists only with the hidden order phase. The presence of parasitic ferro-and/or antiferromagnetic phases with transition temperatures T

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Magnetic properties of U(Ru1−xRhx)2Si2 single crystals (0≤x≤1)

Cited by 48 publications

References 11 publications

Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

The suppression of hidden order and the onset of ferromagnetism in URu₂Si₂via Re substitution

Ferromagnetic instability at the edge of intermediate valence

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Magnetic properties of U(Ru1−xRhx)2Si2 single crystals (0≤x≤1)

Cited by 48 publications

References 11 publications

Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

The suppression of hidden order and the onset of ferromagnetism in URu2Si2via Re substitution

Ferromagnetic instability at the edge of intermediate valence

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The suppression of hidden order and the onset of ferromagnetism in URu₂Si₂via Re substitution