High-field magnetism and magnetoacoustics in uranium intermetallic antiferromagnets

Андреев, А.В.; Skourski, Y.; Yasin, S.; Жерлицын, С.; Wosnitza, J.

doi:10.1016/j.jmmm.2012.02.055

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…The chains are antiferromagnetically coupled. A spin-flop transition is induced in a magnetic field applied along the c axis of H c,crit = 14 T. A similar spin flop mechanism was detected for the magnetization along the b axis at H b,crit = 21 T 13,14 . Then, the b axis becomes the easy magnetization axis, similar to the magnetic behavior of FM URhGe.…”

Section: Introductionsupporting

confidence: 60%

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: Introductionsupporting

confidence: 60%

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

et al. 2017

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Section: B Magnetizationmentioning

confidence: 99%

“…This second-to first-order-like tricritical point is similar to that seen in canonical metamagnets such as FeCl2, CoCl2, and Ni(NO3)2 !H20 and more recently in CeRh2Si2 and other (U,Ce)X2Si2 systems [34][35][36][37][38]. Following the work of Bidaux et al [39] we calculated the tricritical temperature using the mean-field formula for a two sublattice antiferromagnet with ferromagnetic intralayer coupling such that,…”

Section: B Magnetizationmentioning

confidence: 99%

Tricritical point of the f -electron antiferromagnet USb2 driven by high magnetic fields

et al. 2017

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In pulsed magnetic fields up to 65T and at temperatures below the Néel transition, our magnetization and magnetostriction measurements reveal a field-induced metamagnetic-like transition that is suggestive of an antiferromagnetic to ferrimagnetic ordering. Our data also suggests a change in the nature of this metamagnetic-like transition from second-to first-orderlike near a tricritical point at T tc ~145K and H c~5 2T. At high fields for H>H c we found a decreased magnetic moment roughly half of the moment determined by neutron powder diffraction. We propose that the decreased moment and lack of saturation at high fields indicate the presence of a field-induced ferrimagnetic state above the tricritical point of the H-T phase diagram for USb 2 .

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“…UIrGe exhibits in fields applied along the b axis some peculiarities which deserve further investigation. The magnetization in the b-axis fields higher than Hc reaches considerably higher values than in the corresponding c-axis fields 8,11 although a ferromagnetic-like state in the c-axis field above Hc has been suggested from the aforementioned neutron experiment 10 .…”

Section: Introductionmentioning

confidence: 98%

Magnetic field induced phenomena in UIrGe in fields applied along the b axis

et al. 2018

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The metamagnetic transition between the antiferromagnetic and paramagnetic state in UIrGe has been studied at various temperatures by magnetization, heat capacity and magnetocaloric-effect measurements on a single crystal in static and pulsed magnetic fields applied along the orthorhombic b-axis. A first-order transition is observed at temperatures below 13 K and a secondorder one at higher temperatures up to the Néel temperature (TN = 16.5 K). The first-order transition is accompanied by a dramatic increase of the Sommerfeld coefficient. Magnetization measurements extended to the paramagnetic range revealed an anomalous S-shape (inflection point at a magnetic field Hm) in magnetization isotherms at temperatures above 13 K and a temperature dependence of susceptibility with a maximum at Tmax well above TN. The lines representing the temperature-induced evolution of Hm and field-induced evolution of Tmax, respectively, are bound for the point in the magnetic phase diagram at which the order of metamagnetic transition changes. A tentative scenario explaining these anomalies by antiferromagnetic correlations or short-range order in the paramagnetic state is discussed.

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High-field magnetism and magnetoacoustics in uranium intermetallic antiferromagnets

Cited by 5 publications

References 11 publications

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

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

Tricritical point of the f -electron antiferromagnet USb2 driven by high magnetic fields

Magnetic field induced phenomena in UIrGe in fields applied along the b axis

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