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Klingner, C.; Krellner, C.; Brando, M.; Geibel, C.; Steglich, F.; Vyalikh, D. V.; Kummer, K.; Danzenbächer, S.; Молодцов, С. Л.; Laubschat, C.; Kinoshita, Toyohiko; Kato, Y.; Matsuki, Takayuki

doi:10.1103/physrevb.83.144405

Cited by 51 publications

(85 citation statements)

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“…1(a)] suggests that the transition at T L involves a ferromagnetic ordering component for x < 0.27. Parenthetically, we note that antiferromagnetism takes over again for x 0.6, with YbCo 2 Si 2 displaying a Néel transition at T N = 1.65 K and a large in-plane ordered moment of 1.4 μ B [6,9].…”

Section: Introductionmentioning

confidence: 66%

“…We employ the single-site Metropolis algorithm combined with microcanonical steps to improve the sampling at lower temperatures. Typically, we run 10 6 MC steps (MCS) as initial thermalization followed by 10 6 MCS to obtain thermal averages, which are calculated by dividing the measurement steps into 10 bins. Here one MCS corresponds to one attempted spin flip per site.…”

Section: B Monte Carlo Simulationsmentioning

confidence: 99%

“…A central observation in the phase diagram [6,8] of Yb(Rh 1−x Co x ) 2 Si 2 [ Fig. 1(a)] is that the two thermal phase transitions at T N and T L , existing for small x, merge close to x = 0.27.…”

Section: A Competing Anisotropies and Bicriticalitymentioning

confidence: 99%

“…Moreover, a second phase transition at T L < T N occurs at small fields, Fig. 1(a), with the precise nature of the phase for T < T L being unknown [5,6]. Interestingly, an almost divergent uniform susceptibility was reported for stoichiometric YbRh 2 Si 2 , hinting at the presence of ferromagnetic correlations [7].…”

Section: Introductionmentioning

confidence: 95%

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Competing orders, competing anisotropies, and multicriticality: The case of Co-dopedYbRh2Si2

et al. 2014

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Motivated by the unusual evolution of magnetic phases in stoichiometric and Co-doped YbRh 2 Si 2 , we study Heisenberg models with competing ferromagnetic and antiferromagnetic ordering combined with competing anisotropies in exchange interactions and g factors. Utilizing large-scale classical Monte Carlo simulations, we analyze the ingredients required to obtain the characteristic crossing point of uniform susceptibilities observed experimentally near the ferromagnetic ordering of Yb(Rh 0.73 Co 0.27 ) 2 Si 2 . The models possess multicritical points, which we speculate to be relevant for the behavior of clean as well as doped YbRh 2 Si 2 . We also make contact with experimental data on YbNi 4 P 2 , where a similar susceptibility crossing has been observed.

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Section: Introductionmentioning

confidence: 66%

Section: B Monte Carlo Simulationsmentioning

confidence: 99%

Section: A Competing Anisotropies and Bicriticalitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Competing orders, competing anisotropies, and multicriticality: The case of Co-dopedYbRh2Si2

et al. 2014

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“…Interestingly, isoelectronic cobalt substitution for rhodium or hydrostatic pressure stabilize FM order along the hard axis at low temperatures [11,25]. This behavior has been interpreted as a combined effect of magnetic frustration and classical fluctuations [26].…”

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confidence: 99%

Fluctuation-Driven Magnetic Hard-Axis Ordering in Metallic Ferromagnets

2014

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We investigate the interplay of quantum fluctuations and magnetic anisotropies in metallic ferromagnets. Our central result is that fluctuations close to a quantum critical point can drive the moments to point along a magnetic hard axis. As a proof of concept, we show this behavior explicitly for a generic two-band model with local Coulomb and Hund's interactions, and a spin-orbit-induced easy plane anisotropy. The phase diagram is calculated within the fermionic quantum order-bydisorder approach, which is based on a self-consistent free energy expansion around a magnetically ordered state with unspecified orientation. Quantum fluctuations render the transition of the easyplane ferromagnet first-order below a tricritical point. At even lower temperatures, directionally dependent transverse fluctuations dominate the magnetic anisotropy and the moments flip to lie along the magnetic hard axis. We discuss our findings in the context of recent experiments that show this unusual ordering along the magnetic hard direction.PACS numbers: 74.40. Kb, 75.50.Cc, 75.30.Gw, 75.70.Tj Fluctuations near to quantum critical points in itinerant ferromagnets (FMs) can have drastic and often surprising effects. They generically render a priori continuous phase transitions first order at low temperatures [1][2][3][4][5]. In many systems, quantum phase transitions are preempted by the formation of superconducting [5][6][7], modulated magnetic [8], or unusual spin-glass phases [9,10]. Other metallic FMs show an unexpected ordering along the magnetic hard axis [11,12].It is well understood that the first-order behavior arrises from the coupling of the magnetic order parameter to soft electronic particle-hole fluctuations, giving rise to non-analytic terms in the free energy [13][14][15][16]. Because of this interplay between low-energy quantum fluctuations, metallic FMs are very susceptible towards the formation of incommensurate magnetic [17], spin nematic [14] or modulated superconducting states [18]. This spatial modulation is associated with deformations of the Fermi surface that enhance the phase space for low energy particle-hole fluctuations. The phase reconstruction can therefore be viewed as a fermionic quantum orderby-disorder effect, which can be studied systematically by self-consistently calculating fluctuations around a whole class of possible broken-symmetry states [19][20][21].The coupling to electronic quantum fluctuations can also have counter-intuitive effects upon the direction of the magnetic order parameter. A notable example is the partially ordered phase of the helimagnet MnSi, in which the spiral ordering vector rotates away from the lattice favored directions [22,23]. Similar effects are possible in homogenous itinerant FMs. This is suggested by recent experiments that show unusual ordering of magnetic moments along hard magnetic directions [11,12].The first example is YbRh 2 Si 2 , which is a prototypical system for studying antiferromagnetic quantum criticality, but exhibits strong FM fluctuations [24]. In...

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Electron spin resonance of the Yb 4f‐moment in Yb(Rh_1−xFe_x)₂Si₂

Sichelschmidt¹,

Jeevan²,

Mchalwat³

et al. 2013

Physica Status Solidi (b)

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The electron spin resonance (ESR) signal of the heavy-fermion metal YbRh 2 Si 2 is investigated in terms of its dependence on the partial substitution of Rh by Fe. This non-isovalent substitution gives rise to a chemical pressure and also leads to a reduction of the conduction electron density of states (hole doping). The values and anisotropy of the ESR parameters are comparable with those of Yb(Rh 1Àx Co x ) 2 Si 2 for Fe-contents up to at least 10%. This result provides additional evidence that the Kondo interaction allows narrow ESR spectra in a heavy fermion compound. The absence of an ESR signal for 30% Fe content points towards a distribution of different crystal electric field symmetries at the Yb-sites, leading to a dominating disorder-related broadening.

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Evolution of magnetism in Yb(Rh1−xCox)<

Cited by 51 publications

References 45 publications

Competing orders, competing anisotropies, and multicriticality: The case of Co-dopedYbRh2Si2

Competing orders, competing anisotropies, and multicriticality: The case of Co-dopedYbRh2Si2

Fluctuation-Driven Magnetic Hard-Axis Ordering in Metallic Ferromagnets

Electron spin resonance of the Yb 4f‐moment in Yb(Rh_1−xFe_x)₂Si₂

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Evolution of magnetism in Yb(Rh1−xCox)<

Cited by 51 publications

References 45 publications

Competing orders, competing anisotropies, and multicriticality: The case of Co-dopedYbRh2Si2

Competing orders, competing anisotropies, and multicriticality: The case of Co-dopedYbRh2Si2

Fluctuation-Driven Magnetic Hard-Axis Ordering in Metallic Ferromagnets

Electron spin resonance of the Yb 4f‐moment in Yb(Rh1−xFex)2Si2

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Electron spin resonance of the Yb 4f‐moment in Yb(Rh_1−xFe_x)₂Si₂