Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Ca<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>RuO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:m

Gat-Malureanu, I. M.; Carlo, J. P.; Goko, T.; Fukaya, A.; Ito, T.; Kyriakou, P. P.; Larkin, M.; Luke, G. M.; Russo, Peter L.; Savici, A. T.; Wiebe, C. R.; Yoshimura, Kazuyoshi; Uemura, Y. J.

doi:10.1103/physrevb.84.224415

Cited by 21 publications

(9 citation statements)

References 55 publications

(52 reference statements)

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“…Such tendencies were also seen in the itinerant ferromagnet (Sr,Ca)RuO 3 close to the disappearance of static magnetic order around a Ca concentration of 0.7 (ref. 18 ). The first-order transition may be a generic feature of weak magnetic order in itinerant–electron systems 19 .…”

Section: Resultsmentioning

confidence: 99%

An itinerant antiferromagnetic metal without magnetic constituents

Svanidze¹,

Wang²,

Besara³

et al. 2015

Nat Commun

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The origin of magnetism in metals has been traditionally discussed in two diametrically opposite limits: itinerant and local moments. Surprisingly, there are very few known examples of materials that are close to the itinerant limit, and their properties are not universally understood. In the case of the two such examples discovered several decades ago, the itinerant ferromagnets ZrZn2 and Sc3In, the understanding of their magnetic ground states draws on the existence of 3d electrons subject to strong spin fluctuations. Similarly, in Cr, an elemental itinerant antiferromagnet with a spin density wave ground state, its 3d electron character has been deemed crucial to it being magnetic. Here, we report evidence for an itinerant antiferromagnetic metal with no magnetic constituents: TiAu. Antiferromagnetic order occurs below a Néel temperature of 36 K, about an order of magnitude smaller than in Cr, rendering the spin fluctuations in TiAu more important at low temperatures. This itinerant antiferromagnet challenges the currently limited understanding of weak itinerant antiferromagnetism, while providing insights into the effects of spin fluctuations in itinerant–electron systems.

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Section: Resultsmentioning

confidence: 99%

An itinerant antiferromagnetic metal without magnetic constituents

Svanidze¹,

Wang²,

Besara³

et al. 2015

Nat Commun

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“…Scale-dependent strain fields, caused by the different values of the ionic radii of Sr and Ca can lead to modified effective exponents 22 . The mSR relaxation rate T 1 À 1 of SCRO for x ¼ 0.7 was found to exhibit at low T a behaviour T 1 B constant 12 . A scaling analysis leads to T 1 pT y with yz ¼ (d À 1)b/n À d, which for our data yields yD À 1.…”

Section: Discussionmentioning

confidence: 99%

“…While specific heat 3 and NMR 4 measurements both concluded that the self-consistent renormalization theory 9 , equivalent to the Hertz-Millis model 10,11 , could describe the underlying physics of an FM QCP in SCRO, recent Kerr effect measurements on a composition-spread epitaxial film showed that a possible quantum phase transition (QPT) around a (reduced) critical concentration x c were smeared by disorder originating from the difference of ionic radii between Sr and Ca ions 8 . In addition, on the basis of muon-spin-rotation (mSR) experiments, it was argued that a spontaneous phase separation may be a common feature in FM systems near their QPTs, leading to a suppression of dynamic critical behaviour 7,12 . From the theoretical point of view, the conventional Hertz-Millis-Moriya model [9][10][11] predicts, for threedimensional itinerant magnets, dynamical critical exponents z ¼ 2 for antiferromagnets, as well as z ¼ 3 for clean and z ¼ 4 for disordered ferromagnets 10 .…”

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confidence: 99%

Anomalous quantum criticality in an itinerant ferromagnet

et al. 2015

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The dynamics of continuous phase transitions is governed by the dynamic scaling exponent relating the correlation length and correlation time. For transitions at finite temperature, thermodynamic critical properties are independent of the dynamic scaling exponent. In contrast, at quantum phase transitions where the transition temperature becomes zero, static and dynamic properties are inherently entangled by virtue of the uncertainty principle. Consequently, thermodynamic scaling equations explicitly contain the dynamic exponent. Here we report on thermodynamic measurements (as a function of temperature and magnetic field) for the itinerant ferromagnet Sr 1 À x Ca x RuO 3 where the transition temperature becomes zero for x ¼ 0.7. We find dynamic scaling of the magnetization and specific heat with highly unusual quantum critical dynamics. We observe a small dynamic scaling exponent of 1.76 strongly deviating from current models of ferromagnetic quantum criticality and likely being governed by strong disorder in conjunction with strong electron-electron coupling.

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“…The small saturation moments of itinerant systems preclude neutron diffraction investigations, similar to the case of ZrZn 2 [45]. On the contrary, the muon spin relaxation (µSR) technique is extremely sensitive to local magnetic fields and has been used to investigate multiple itinerant systems [46][47][48][49][50]. Figure 10 shows the time spectra observed in zero field (ZF) and longitudinal field (LF) at the lowest temperature.…”

Section: Muon Spin Relaxation Measurementsmentioning

confidence: 99%

Non-Fermi Liquid Behavior Close to a Quantum Critical Point in a Ferromagnetic State without Local Moments

et al. 2015

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A quantum critical point (QCP) occurs upon chemical doping of the weak itinerant ferromagnet Sc3.1In. Remarkable for a system with no local moments, the QCP is accompanied by non-Fermi liquid (NFL) behavior, manifested in the logarithmic divergence of the specific heat both in the ferro-and the paramagnetic states. Sc3.1In displays critical scaling and NFL behavior in the ferromagnetic state, akin to what had been observed only in f -electron, local moment systems. With doping, critical scaling is observed close to the QCP, as the critical exponents δ, γ and β have weak composition dependence, with δ nearly twice, and β almost half of their respective mean-field values. The unusually large paramagnetic moment µP M ∼ 1.3µB/F.U. is nearly composition-independent. Evidence for strong spin fluctuations, accompanying the QCP at xc = 0.035±0.005, may be ascribed to the reduced dimensionality of Sc3.1In, associated with the nearly one-dimensional Sc-In chains.arXiv:1410.6850v1 [cond-mat.str-el]

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Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr1−xCaxRuO

Cited by 21 publications

References 55 publications

An itinerant antiferromagnetic metal without magnetic constituents

An itinerant antiferromagnetic metal without magnetic constituents

Anomalous quantum criticality in an itinerant ferromagnet

Non-Fermi Liquid Behavior Close to a Quantum Critical Point in a Ferromagnetic State without Local Moments

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