Muon spin rotation and magnetic order in the heavy-fermion compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">URu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow>

De, MacLaughlin; Cooke, D. W.; Heffner, R. H.; Hutson, R. L.; Mw, McElfresh; Me, Schillaci; Hd, Rempp; Smith, J. G.; Jo, Willis; Zirngiebl, E.; Boekema, C.; Lichti, R.L.; Oostens, J.

doi:10.1103/physrevb.37.3153

Cited by 68 publications

(18 citation statements)

References 9 publications

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“…µSR measurements under applied pressure have also confirmed this first-order transition to the LMAF state, and demonstrate no pressure-dependence of the internal fields from 0.5-1.5 GP a [11]. In addition, µSR [12,13] and NMR measurements [14] show that the weak antiferromagnetic moment seen at ambient pressure can be explained by a small phase separated volume fraction of the pressure-induced antiferromagnetic state coexisting with the hidden order state. It is now widely accepted that this low moment antiferromagnetism is extrinsic to the hidden order state and is caused by inhomogeneous strain in measured crystals [15].…”

Section: Introductionmentioning

confidence: 76%

Antiferromagnetism and hidden order in isoelectronic doping ofURu2Si2

et al. 2016

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We present muon spin rotation (µSR) and susceptibility measurements on single crystals of isoelectronically doped URu2−xTxSi2 (T = Fe, Os) for doping levels up to 50%. Zero Field (ZF) µSR measurements show longlived oscillations demonstrating that an antiferromagnetic state exists down to low doping levels for both Os and Fe dopants. The measurements further show an increase in the internal field with doping for both Fe and Os.Comparison of the local moment -hybridization crossover temperature from susceptibility measurements and our magnetic transition temperature shows that changes in hybridization, rather than solely chemical pressure, are important in driving the evolution of magnetic order with doping.

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Section: Introductionmentioning

confidence: 76%

Antiferromagnetism and hidden order in isoelectronic doping ofURu2Si2

et al. 2016

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“…The hidden order transition is given its name because, although roughly 0.2Rln2 of entropy is released at T 0 (clearly showing a phase transition to a new state for T ≤ T 0 ), intense experimental and theoretical efforts to uncover the order parameter have been unsuccessful: e.g. neutron scattering and μSR techniques yield ordered moments that are much too small to account for the entropy that is released at T 0 [4,5]. Considerable interest has also been paid to the superconducting state, which is clearly unconventional as evidenced by: (1) its occurrence deep inside the hidden order state [1][2][3], (2) the low carrier density from which it emerges [6,7], (3) the large upper critical field [8] and (4) measurements which suggest the presence of nodes in the superconducting energy gap [7,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

High purity specimens of URu₂Si₂produced by a molten metal flux technique

Baumbach

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Ronning

et al. 2014

Philosophical Magazine

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We report a molten metal flux technique to produce high purity specimens of URu 2 Si 2 . Magnetic susceptibility (M/H = χ ), heat capacity (C) and electrical resistivity (ρ) measurements show that the bulk properties of these crystals are similar to those that are produced by the Czochralski technique followed by solid-state electro-transport. In particular, we find residual resistivity ratios RRR = ρ 300K /ρ 0 as large as 220.

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“…i) The magnetic Bragg peak intensities were surprisingly small, corresponding to an ordered U moment of only µ ord ≈ (0.04 ± 0.01) µ B /U (neutrons) and µ ord ≈ (0.02 ± 0.01) µ B /U (x-rays). Muon spin rotation (µSR) measurements provided an ordered moment that was even an order of magnitude smaller (MacLaughlin et al, 1988).ii) The magnetic correlation lengths of about 400Å are not resolution limited, i.e., the magnetic order is not truly long-ranged. iii) The measured temperature dependence of the neutron and Bragg intensities does not resemble a typical order parameter curve with its convex T-behavior.…”

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confidence: 99%

Colloquium: Hidden order, superconductivity, and magnetism: The unsolved case ofURu2Si2

2011

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This Colloquium reviews the 25 year quest for understanding the continuous (2 nd ) order, meanfield-like phase transition occurring at 17.5 K in URu 2 Si 2 . Since ca. ten years the term hidden order (HO) has been coined and utilized to describe the unknown ordered state, whose origin cannot be disclosed by conventional solid-state probes, such as x-rays, neutrons, or muons. HO is able to support superconductivity at lower temperatures (Tc ≈ 1.5 K) and when magnetism is developed with increasing pressure both the HO and the superconductivity are destroyed. Other ways of probing the HO are via Rh-doping and very large magnetic fields. During the last few years a variety of advanced techniques have been tested to probe the HO state and their attempts will be summarized. A digest of recent theoretical developments is also included. It is the objective of this survey to shed additional light on the HO state and its associated phases in other materials. VII. Present State of HO 12Acknowledgments 16 References 17Figures 21 I. HISTORICAL BACKGROUNDUranium is a most intriguing element, not only in itself but also as a basis for forming a variety of compounds and alloys with unconventional or puzzling physics properties (for recent reviews, see Sechovský and Havela (1998), Santini et al. (1999), Stewart (2006)). Natural or depleted uranium, i.e. containing 99.5 percent 238 U has a * Electronic address: mydosh@physics.leidenuniv.nl † Electronic address: peter.oppeneer@physics.uu.se mild alpha radioactivity of 25 kBq/g, which allows Ubased samples to be fabricated and studied in university laboratories with a minimum of safety precautions. Following initial discoveries of unexpected superconductivity and heavy-fermion behavior in uranium-based compounds as UBe 13 (Ott et al., 1983) and UPt 3 (Stewart et al., 1984) it has become popular to synthesize uranium compounds and to cool these in search for exotic ground states. Over the past 50 or so years many conducting and insulating systems were synthesized, analyzed and structurally characterized (Sechovský and Havela, 1998;Stewart, 2001Stewart, , 2006. The usual classification of the metallic samples at low temperature is superconducting and/or magnetic or with some of the modern compounds designated as "exotic" (Pfleiderer, 2009).Why are uranium-based materials so interesting? The observed variety of unusual behaviors derive directly from the U open 5f shell. Several defining electronic structure quantities of the U f electrons are all on the same energy scale: the exchange interaction, 5f bandwidth, the spin-orbit interaction, and intra-atomic f − f Coulomb interaction. As a consequence, i) elemental uranium displays intermediate behavior between the transition metals and the rare-earths in their characteristic bandwidths, yet it generates the largest spin-orbit coupling. ii) U lies directly on the border between localized and itinerant (or overlapping) 5f wavefunctions. iii) The WignerSeitz radii R WS of comparative elements places U near the minimum between metallic and...

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Muon spin rotation and magnetic order in the heavy-fermion compoundURu2Si2

Cited by 68 publications

References 9 publications

Antiferromagnetism and hidden order in isoelectronic doping ofURu2Si2

Antiferromagnetism and hidden order in isoelectronic doping ofURu2Si2

High purity specimens of URu₂Si₂produced by a molten metal flux technique

Colloquium: Hidden order, superconductivity, and magnetism: The unsolved case ofURu2Si2

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Muon spin rotation and magnetic order in the heavy-fermion compoundURu2Si2

Cited by 68 publications

References 9 publications

Antiferromagnetism and hidden order in isoelectronic doping ofURu2Si2

Antiferromagnetism and hidden order in isoelectronic doping ofURu2Si2

High purity specimens of URu2Si2produced by a molten metal flux technique

Colloquium: Hidden order, superconductivity, and magnetism: The unsolved case ofURu2Si2

Contact Info

Product

Resources

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High purity specimens of URu₂Si₂produced by a molten metal flux technique