Superconductivity in the YIr2Si2and LaIr2Si2Polymorphs

Vališka, Michal; Pospíšil, Jiří; Prokleška, Ján; Diviš, M.; Rudajevová, A.; Sechovský, V.

doi:10.1143/jpsj.81.104715

Cited by 28 publications

(30 citation statements)

References 48 publications

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“…and the observed FM dome in UCo1-xRuxGe. We have shown that Ru substitution (x ≤ 0.1) 14 seems to lead to an increase of the U orbital moment (and consequently the total U moment), which reflects a certain localization of the 5f electrons as manifested by a corresponding growth of the | / | ratio. We may conclude that the appearance of the FM dome in UCo1-xRuxGe is due to a change of the degree of 5f-ligand hybridization which determined the degree of localization of the U 5f states.…”

Section: Discussionmentioning

confidence: 84%

“…and UCo0.88Ru0.12Ge single crystals where non-Fermi liquid state develops in the boundary of ferromagnetism at x = 0.31% 14 . Finally we would like to discuss the relative values of the U and Co magnetic moments in our substituted compounds and compare them to those reported for UCoGe 21 .…”

Section: Discussionmentioning

confidence: 99%

“…Another notable magnetic feature is the observed stabilization of the originally very weak itinerant FM by substitution of the Co(Rh) site by other transition metals even when the opposite side parent compound is a paramagnet [11][12][13] . As a result, unusual FM domes exist in the UCo1-xTxGe 13,14 (T = Ru, Fe) and URh1-xTxGe 15,16 (T = Ru, Co) T-x phase diagrams. The observed FM domes are characterized by an increase of the Curie temperature TC or spontaneous magnetic moment µspont.…”

Section: Introductionmentioning

confidence: 99%

“…with increasing initial substitutions. The development of ferromagnetism in substituted UCo1-xTxGe 13,14 and URh1-xTxGe 15,16 has a serious impact on the superconducting state, as it is immediately suppressed already by small percentages of substituent element 11 . This implies drastic changes in the ferromagnetic state and the magnitude of the spin fluctuations in the substituted systems.…”

Section: Introductionmentioning

confidence: 99%

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Gradual Localization of 5fStates in Orthorhombic UTX Ferromagnets:Polarized Neutron Diffraction Study of Ru Substituted UCoGe

et al. 2015

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We report on a microscopic study of the evolution of ferromagnetism in the Ru substituted ferromagnetic superconductor (FM SC) UCoGe crystallizing in the orthorhombic TiNiSi-type structure. For that purpose, two single crystals with composition UCo0.97Ru0.03Ge and UCo0.88Ru0.12Ge have been prepared and characterized by magnetization, AC susceptibility, specific heat and electrical resistivity measurements. Both compounds have been found to order ferromagnetically below TC = 6.5 K and 7.5 K, respectively, which is considerably higher than the TC = 3 K of the parent compound UCoGe. The higher values of TC are accompanied by enhanced values of the spontaneous moment spont. = 0.11 B/f.u. and spont. = 0.21 B/f.u., respectively in comparison to the tiny spontaneous moment of UCoGe (about 0.07B/f.u.). No sign of superconductivity was detected in either compound. The magnetic moments of the samples were investigated on the microscopic scale using polarized neutron diffraction (PND) and for UCo0.88Ru0.12Ge also by soft X-ray magnetic circular dichroism (XMCD). The analysis of the PND results indicates that the observed enhancement of ferromagnetism is mainly due to the growth of the orbital part of the uranium 5f moment , reflecting a gradual localization of the 5f electrons with Ru substitution. In addition, the parallel orientation of the U and Co moments has been established in both substituted compounds. The results are discussed and compared with related isostructural ferromagnetic UTX compounds (T -transition metals, X -Si, Ge) in the context of a varying degree of the 5f-ligand hybridization.

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Section: Discussionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gradual Localization of 5fStates in Orthorhombic UTX Ferromagnets:Polarized Neutron Diffraction Study of Ru Substituted UCoGe

et al. 2015

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“…A remarkable observation has been made by Shelton et al [5], who concluded from his studies on an extended series of nonmagnetic RT 2 M 2 polymorphs that only those crystallizing with the CaBe 2 Ge 2 -type structure may exhibit superconductivity, while their ThCr 2 Si 2 -type counterparts always remain normal down to the lowest temperatures available. The suggested scenario has recently been confirmed for YIr 2 Si 2 and LaIr 2 Si 2 [6]. The related compound ThIr 2 Si 2 was reported to crystallize with the CaBe 2 Ge 2 -type unit cell only [5].…”

Section: Introductionmentioning

confidence: 76%

Superconductivity in ThIr₂Si₂

Domieracki

Kaczorowski

2016

Acta Phys. Pol. A

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The compound ThIr2Si2 crystallizes with a tetragonal crystal structure of the CaBe2Ge2-type (space group P 4/nmm). Its low-temperature physical properties were investigated by means of magnetization, electrical resistivity, and heat capacity measurements, performed down to 0.35 K. The experiments revealed bulk superconductivity below Tc = 2 K. The obtained data indicate that ThIr2Si2 is a weakly-coupled type-II BCS superconductor.

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First‐Principles Calculations to Investigate the Structural, Mechanical, Electronic, Optical and Thermal Properties of Disilicides Materials UT₂Si₂ (T = Ru, Rh, and Pd)

Rahman,

Khatun,

Mia

et al. 2024

Physica Status Solidi (b)

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Different physical features of UT2Si2 (T = Ru, Rh, Pd) are investigated using ab initio methods. The examined lattice parameters are closely aligned with the experimental data. The negative cohesive energy ensures the chemical stability of the UT2Si2 (T = Ru, Rh, Pd). The mechanical stability of UT2Si2 (T = Ru, Rh, Pd) is ensured from the positive elastic constants. Very large bulk and Young's moduli of URu2Si2, and URh2Si2 ensures their high resistance to volume and longitudinal deformation. Whereas the lower Young's modulus (E) for UPd2Si2 suggests its heightened capacity to resist thermal shock resistance. The high machinable index of UPd2Si2 compared to URu2Si2 and URh2Si2 confirm its more damage‐tolerant and high elastic behavior and probable industrial applications. All the phases exhibit elastic anisotropy and ductile nature. Metallic features as well as mixture of covalent and ionic bonding are observed from electronic properties. Furthermore, the investigation on optical properties suggests the potential use of UT2Si2 (T = Ru, Rh, Pd) in anti‐reflection coatings, UV detectors, and optoelectronic devices due to their notable peaks in the UV energy range. The thermodynamic parameters such as Debye temperature as well as minimum thermal conductivity indicate the potential utility of these compounds in thermal barrier coating materials.

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Superconductivity in the YIr₂Si₂and LaIr₂Si₂Polymorphs

Cited by 28 publications

References 48 publications

Gradual Localization of 5fStates in Orthorhombic UTX Ferromagnets:Polarized Neutron Diffraction Study of Ru Substituted UCoGe

Gradual Localization of 5fStates in Orthorhombic UTX Ferromagnets:Polarized Neutron Diffraction Study of Ru Substituted UCoGe

Superconductivity in ThIr₂Si₂

First‐Principles Calculations to Investigate the Structural, Mechanical, Electronic, Optical and Thermal Properties of Disilicides Materials UT₂Si₂ (T = Ru, Rh, and Pd)

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Superconductivity in the YIr2Si2and LaIr2Si2Polymorphs

Cited by 28 publications

References 48 publications

Gradual Localization of 5fStates in Orthorhombic UTX Ferromagnets:Polarized Neutron Diffraction Study of Ru Substituted UCoGe

Gradual Localization of 5fStates in Orthorhombic UTX Ferromagnets:Polarized Neutron Diffraction Study of Ru Substituted UCoGe

Superconductivity in ThIr2Si2

First‐Principles Calculations to Investigate the Structural, Mechanical, Electronic, Optical and Thermal Properties of Disilicides Materials UT2Si2 (T = Ru, Rh, and Pd)

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Product

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Superconductivity in the YIr₂Si₂and LaIr₂Si₂Polymorphs

Superconductivity in ThIr₂Si₂

First‐Principles Calculations to Investigate the Structural, Mechanical, Electronic, Optical and Thermal Properties of Disilicides Materials UT₂Si₂ (T = Ru, Rh, and Pd)