Specific heat and susceptibility of U(Ru1−Rh)2Si2

Arima, Hiroshi; Hyomi, K.; Nishioka, Takashi; Miyako, Y.; Suzuki, Takahiro

doi:10.1016/0304-8853(88)90354-x

Cited by 24 publications

(28 citation statements)

References 11 publications

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“…2) (Results for the larger x URu 2 Si 2- x P x substitution series will be reported separately). Unlike for other tuning strategies222324252627282930313233, magnetism is distant from hidden order in this phase diagram.…”

Section: Resultsmentioning

confidence: 76%

“…It is also noteworthy that URu 2 Si 2 differs from most other unconventional superconductors, which are typically found near the zero temperature termination point of a line of phase transitions, a ‘quantum critical point,' where strong fluctuations are believed to be favourable for the superconducting pairing18192021. In contrast, the superconductivity in URu 2 Si 2 is fully contained inside the ordered phase, as revealed by numerous tuning studies222324252627282930313233.…”

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confidence: 99%

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Unfolding the physics of URu2Si2 through silicon to phosphorus substitution

et al. 2016

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The heavy fermion intermetallic compound URu2Si2 exhibits a hidden-order phase below the temperature of 17.5 K, which supports both anomalous metallic behavior and unconventional superconductivity. While these individual phenomena have been investigated in detail, it remains unclear how they are related to each other and to what extent uranium f-electron valence fluctuations influence each one. Here we use ligand site substituted URu2Si2-xPx to establish their evolution under electronic tuning. We find that while hidden order is monotonically suppressed and destroyed for x≤0.035, the superconducting strength evolves non-monotonically with a maximum near x≈0.01 and that superconductivity is destroyed near x≈0.028. This behavior reveals that hidden order depends strongly on tuning outside of the U f-electron shells. It also suggests that while hidden order provides an environment for superconductivity and anomalous metallic behavior, it's fluctuations may not be solely responsible for their progression.

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Section: Resultsmentioning

confidence: 76%

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confidence: 99%

Unfolding the physics of URu2Si2 through silicon to phosphorus substitution

et al. 2016

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“…One such perturbation that has been extensively applied to URu 2 Si 2 is chemical doping. Previous studies have found that doping of the silicon site has only a weak effect on the electronic state which may be explained by a chemical pressure effect [21,22], while doping of the uranium [23,24] and ruthenium [25][26][27][28] sites cause much more dramatic changes in the behavior. This indicates that the electronic ground state depends much more strongly on d-f electron hybridization than it does on sp-f hybridization [22].…”

Section: Introductionmentioning

confidence: 99%

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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“…It has been known for since the early work of Amitsuka et al (1988) that small amounts of Rh substituted for Ru create puddles of LMAF and suppress the HO via a combination of stress at the larger Rh-sites and the addition of an extra 4d electron. Above 4 percent Rh substitution on the Ru site both HO and LMAF are removed; and there is only a heavy Fermi liquid (HFL) ground state in low fields, i.e., no ordered phase of any kind.…”

Section: High Magnetic Fields and Rh-dopingmentioning

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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Specific heat and susceptibility of U(Ru1−Rh)2Si2

Cited by 24 publications

References 11 publications

Unfolding the physics of URu2Si2 through silicon to phosphorus substitution

Unfolding the physics of URu2Si2 through silicon to phosphorus substitution

Antiferromagnetism and hidden order in isoelectronic doping ofURu2Si2

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

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