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Gralak, D.; Tran, V.H.

doi:10.1016/j.jssc.2015.01.027

Cited by 4 publications

(5 citation statements)

References 34 publications

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“…The residual resistivity ratio (RRR) was substantially increased by this annealing procedure in the case of UIrGe from 2-4 up to several tens 27 . The RRR of the substituted compounds remains unchanged as observed in the other systems 4,12,21,24,25,28,29 . A precision spark erosion saw was used to cut appropriately shaped samples.…”

Section: Methodsmentioning

confidence: 55%

“…Existence of quantum critical points (QCPs) were reported in the neighboring alloying FM-PM and AFM-paramagnetic (PM) systems URh 1-x Ru x Ge 29,44 , UCo 1-x Fe x Ge 28 , UCo 1-x Ru x Ge 4 or UPd 1-x Ru x Ge 21 . The UIr 1-x Rh x Ge system behaves like the other AFM/FM alloy system UPd 1x Co x Ge where magnetic order survives in the entire concentration range 22 .…”

Section: B Qcp In the Uir 1-x Rh X Ge System At X Critmentioning

confidence: 99%

“…This AFM/FM boundary is of interest because the AFM and FM are separated at this point throughout the whole orthorhombic TiNiSi-type UTGe system by the Hill limit 4 . Many studies have been conducted to determine the delicate balance of magnetic interactions in UTGe alloy systems, but they have been primarily on polycrystalline samples where the crucially important magnetocrystalline anisotropy remains hidden 4,[21][22][23][24][25][26] . Our investigation of single crystal study has allowed us to develop a general picture of the magnetism in the AFM part of the UIr 1-x Rh x Ge system which surprisingly preserves many of the magnetic features of the FM parent compounds URhGe and UCoGe.…”

Section: Introductionmentioning

confidence: 99%

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Switching of magnetic ground states across the UIr1−xRhxGe alloy system

et al. 2017

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We investigated the evolution of magnetism in the UIr 1-x Rh x Ge system by the systematic study of high-quality single crystals. Lattice parameters of both parent compounds are very similar resulting in almost identical nearest interatomic uranium distance close to the Hill limit. We established the x-T phase diagram of the UIr 1-x Rh x Ge system and found a discontinuous antiferromagnetic/ferromagnetic boundary at x crit = 0.56 where a local minimum in ordering temperature and maximum of the Sommerfeld coefficient   175 mJ/mol K 2 occurs in the UCoGe-URhGe-UIrGe system, signaling an increase in magnetic fluctuations. However, a quantum critical point is not realized because of the finite ordering temperature at x crit . A magnon gap on the antiferromagnetic side abruptly suppresses magnetic fluctuations. We find a fieldinduced first order transition in the vicinity of the critical magnetic field along the b axis in the entire UIr 1-x Rh x Ge system including the ferromagnetic region UCo 0.6 Rh 0.4 Ge -URhGe. *E-mail address: jiri.pospisil@centrum.cz 2 the b axis becomes the easy magnetization axis, similar to the magnetic behavior of FM URhGe. Here the so-called intermediate b axis is characterized by a magnetic moment re-orientation at a critical magnetic field H R = 12 T which restores the SC state 5, 15 . Recent papers revealed strong tricritical fluctuations in the vicinity of H R 16, 17 accompanied by a Lifshitz-type transition and enhancement of the coefficient  18-20 .We studied the magnetic properties and quantum critical phenomena in the UIr 1-x Rh x Ge system which has an interesting FM/ antiferromagnetic (AFM) boundary at low temperature. This AFM/FM boundary is of interest because the AFM and FM are separated at this point throughout the whole orthorhombic TiNiSi-type UTGe system by the Hill limit 4 . Many studies have been conducted to determine the delicate balance of magnetic interactions in UTGe alloy systems, but they have been primarily on polycrystalline samples where the crucially important magnetocrystalline anisotropy remains hidden 4, 21-26 . Our investigation of single crystal study has allowed us to develop a general picture of the magnetism in the AFM part of the UIr 1-x Rh x Ge system which surprisingly preserves many of the magnetic features of the FM parent compounds URhGe and UCoGe. Our discussion and conclusions are based on a detailed analysis of the crystal structure, magnetization, and heat capacity.

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Section: Methodsmentioning

confidence: 55%

Section: B Qcp In the Uir 1-x Rh X Ge System At X Critmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Switching of magnetic ground states across the UIr1−xRhxGe alloy system

et al. 2017

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“…A consecutive UCoGe-URhGe-UIrGe dU-U-T phase diagram, respecting Hill limit scenario [12], will be constructed based on analysis of the magnetization and heat capacity data to uncover the evolution of Tmax, which remained hidden in so far performed polycrystalline studies [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Consecutive magnetic phase diagram of UCoGe-URhGe-UIrGe system

Pospíšil

Haga

Miyake

et al. 2018

Physica B: Condensed Matter

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We prepared single crystals in UCo1−xRhxGe and UIr1−xRhxGe systems to establish a complex dU-U-T (dU-U is the shortest interatomic uranium distance and T is temperature) magnetic phase diagram. This recognized a characteristic maximum in magnetic susceptibility at temperature Tmax along the b axis as an important parameter. Three magnetically ordered regions can be distinguished within this scope; first a ferromagnetic region with Curie temperature < Tmax, second a ferromagnetic region with Curie temperature  Tmax and finally an antiferromagnetic region existing on the UIrGe side with Néel temperature < Tmax.

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“…On the other hand, criticality on the Ru-rich side is an entirely untouched subject. Other UTX alloying systems with TiNiSi-type structure are currently intensively studied and a non-Fermi liquid state appears at the substituent-rich boundaries of the similarly emergent magnetic phases [23][24][25][26] . In contrast, the FM phase in UCo1-xRuxAl reaches much higher TC, survives to significantly higher concentrations of Ru and, in particular, the FM/PM transition is predicted not to be a simple one 12) .…”

Section: Introductionmentioning

confidence: 99%

Properties and Collapse of the Ferromagnetism in UCo₁₋_xRu_xAl Studied in Single Crystals

et al. 2016

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We have investigated the ferromagnetic (FM) phase which suddenly develops in UCo1-xRuxAl and is isolated by paramagnetic regions on both sides from the parent UCoAl and URuAl. For that purpose we have grown high quality single crystals with x = 0.62, 0.70, 0.74, 0.75 and 0.78. The properties of the FM phase have been investigated by microscopic and macroscopic methods. Polarized neutron diffraction on a single crystal with x = 0.62 revealed the gradual growth of the hybridization between U and T-site in the U -T plane with increasing x. Hybridization works here as a mediator of the strong indirect interaction, while the delocalized character of the 5 f states is still conserved. As a result very weak spontaneous magnetic moments are observed for all alloys with magnitude nearly in proportion to the TC for x < 0.62, while an enormous disproportion exists between them near xcrit.. The magnetization, specific heat, electrical resistivity, and Hall effect measurements confirmed that the FM transition is suppressed continuously at the critical concentration xcrit.  0.77. Two quantum critical points are then expected on both sides of the FM dome. We propose a scenario that the order of the FM/PM transition differs at opposite boundaries of the FM dome. We conclude that both criticalities are influenced by disorder. Criticality on the UCoAl side has the character of a clean FM metal, while on the Ru rich side it has the character of a magnetically inhomogeneous system involving a Griffiths phase. IntroductionThe physics of uranium 5f electron systems is a subject of continuing interest because many uranium compounds reveal strong electron correlations leading to phenomena like non-Fermi Liquid (NFL) behavior or unconventional superconductivity.In the UTX series recent interest focuses on two ground state paramagnets (PM) UCoAl 1-6) and URuAl 7) with features differing significantly from ordinary PMs. UCoAl has attracted because of the very low critical field of the metamagnetic transition (Bc  0.6 T), which occurs only in fields parallel to the c axis 8) . This Ising-type anisotropy arises from ferromagnetic fluctuations which lack any transversal component 9, 10) . The paramagnetic ground state of URuAl is also unusual. Magnetic susceptibility is characterized by a broad maximum around 50 K and band structure calculations suggest an anomalous cancelation of the U orbital -and spin -momentum finally responsible for the lack of magnetic ordering 7) . Despite PM ground state, magnetocrystalline anisotropy is conserved in URuAl in contrast to the true Pauli PM UFeAl, which is magnetically isotropic 11) .A spectacular feature of the UCo1-xRuxAl 12) solid solutions, the subject of our research, is that they do not reflect the magnetic ground states of the parent compounds. Instead, a robust FM phase emerges isolated on both sides by a PM phase. Already a very small concentration of Ru (x  0.01) in UCoAl suddenly gives rise to stable FM with an enormous TC jump from zero up to almost 20 K 13,14) . Further substitution by R...

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Magnetic phase diagram of pseudo-ternary solid solution URu1−xPdxGe

Cited by 4 publications

References 34 publications

Switching of magnetic ground states across the UIr1−xRhxGe alloy system

Switching of magnetic ground states across the UIr1−xRhxGe alloy system

Consecutive magnetic phase diagram of UCoGe-URhGe-UIrGe system

Properties and Collapse of the Ferromagnetism in UCo₁₋_xRu_xAl Studied in Single Crystals

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Magnetic phase diagram of pseudo-ternary solid solution URu1−xPdxGe

Cited by 4 publications

References 34 publications

Switching of magnetic ground states across the UIr1−xRhxGe alloy system

Switching of magnetic ground states across the UIr1−xRhxGe alloy system

Consecutive magnetic phase diagram of UCoGe-URhGe-UIrGe system

Properties and Collapse of the Ferromagnetism in UCo1−xRuxAl Studied in Single Crystals

Contact Info

Product

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Properties and Collapse of the Ferromagnetism in UCo₁₋_xRu_xAl Studied in Single Crystals