Mechanism for transitions between ferromagnetic and antiferromagnetic orders in d-electron metallic magnets

Wysokiński, Marcin

doi:10.1038/s41598-019-55658-x

Cited by 11 publications

(5 citation statements)

References 68 publications

(74 reference statements)

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“…Among those are CeRuPO [28], PrPtAl [29], MnP [12], Nb 1−y Fe 2+y [30,31], LaCrGe 3 [32,33], and, very recently, La 5 Co 2 Ge 3 [34]. For understanding the avoided criticality in clean metallic FM systems, LaCrGe 3 [35] turns out to be an important reference system [32,33,35,36]. First, LaCrGe 3 is a simple 3d electron system with simple FM structure at ambient p. Second, the FM transition can be tuned by p to lower T .…”

Section: Introductionmentioning

confidence: 99%

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

et al. 2021

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LaCrGe3 has attracted attention as a paradigm example of the avoidance of ferromagnetic (FM) quantum criticality in an itinerant magnet. Here, we combined thermodynamic (specific heat and thermal expansion), transport, x-ray, and neutron scattering as well as μSR measurements to obtain insights on the temperature-pressure phase diagram of LaCrGe3. Consistent with previous studies of the phase diagram by transport measurements, our thermodynamic data shows clearly that the FM transition at TFM changes its character from second order to first order when it is suppressed to low temperatures by pressure. In addition, previous studies demonstrated that for high pressures a new phase occurs below T2, which was proposed to be a long-wavelength antiferromagnetic state (AFMq). In this paper, we provide evidence from our thermodynamic data that this phase transition is preceded by yet another phase transition at T1>T2. Our μSR data indicate that full magnetic volume fraction is only established below T2, but that this magnetism is characterized by a short correlation length. Within the experimental resolution, our neutron-scattering data is not able to identify any magnetic Bragg peaks. Overall, the microscopic magnetic data is therefore consistent with the formation of FM clusters in the proximity of the avoided FM quantum critical point in LaCrGe3. This conclusion is at odds with the previous proposal of AFMq order and raises questions on the role of disorder in this stochiometric compound.

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Section: Introductionmentioning

confidence: 99%

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

et al. 2021

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“…3a). We, therefore, suggest that the discrepancies in the magnetic behavior of dhcp-FeH are related to a pressureinduced ferromagnetic-antiferromagnetic transition 33 . It is evident that the hyperfine magnetic field on csites decreases faster than that on h-sites and it cannot be resolved above about 30 GPa (Fig.…”

Section: Resultsmentioning

confidence: 77%

Novel Fe hydrides and magnetism in the Fe-H system at high pressures

Kupenko

Bykova

Vasiukov

et al. 2021

Preprint

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The structure and properties of metal-hydrides at extreme conditions is key to the understanding of hydrogen-storage technologies, high-temperature superconductivity, and the dynamics of planetary cores. Here we investigate the phase relations and magnetic properties of iron hydrides, including two novel FeHx compounds, up to 63 GPa and 1800 K by Synchrotron Mössbauer Source spectroscopy and single-crystal X-ray diffraction. We observe the formation of a novel monoclinic iron hydride phase Fe2H∼3 at 63 GPa and 1000 K, which breaks down to a stoichiometric hexagonal closed packed FeH phase upon decompression below 52 GPa at 300 K. The long-range magnetic order in the two newly-synthetized phases persists to higher pressures compared to the well-known double hexagonal closed packed and face-centered cubic phases of FeH. The formation of magnetic Fe-H phases with high hydrogen concentration may influence the magnetic behavior of planetary metallic cores.

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“…As per theoretical prediction [23][24][25][26][28][29][30][31], at low temperatures, such prevention of qcp has been suggested with the outcome of the transition, changing its order from second order ferromagnetic transition to first order kind at the tricritical point or due to the emergence of new phases. With regard to the first order kind transition, experimentally, it has been observed in many metallic systems like [23] MnSi, ZrZn 2 , CoS 2 , UGe 2 , URhGe, UCoAl, URhAl and in the latter, a modulated magnetic phase [32][33][34], new phases [35][36][37] have been observed.…”

Section: Introductionmentioning

confidence: 77%

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point

Brar,

Pathak,

Khalid

et al. 2024

J. Phys.: Condens. Matter

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We investigate the room temperature structure (global and local), temperature dependent magnetic and transport behaviour of Ni1–xVx (0 ≤ x ≤ 0.13) alloys. Our Energy Dispersive Analysis of X-rays results show that the prepared compositions are stoichiometric. With increase in V doping, the compounds exhibit a quantum phase transition around xc = 0.12, where the ferromagnetic phase is suppressed. Our results show that all the compounds stabilize in face centred cubic structure at RT and the lattice parameter shows unusual behaviour close to xc. The magnetic and heat capacity studies show signature of Griffiths phase on either side of xc. From 25 K to the lowest collected temperature, we observe a linear T dependence of resistivity at x = 0.1 and around xc, which is separated by a Fermi-liquid region around x = 0.106. This suggests that the origin of the transport behaviour is different around the quantum critical point and away from it. Our Ni K-edge X-ray Absorption Spectroscopy results show that there is a significant reduction in the first coordination number around Ni central atom on doping. Further, with doping, there is distortion in the first coordination shell around Ni. This suggests, with V doping, the local structure around Ni is different from the global structure as obtained from the X-ray Diffraction results. Interestingly, with doping, we observe a direct connection between the extent of distortion at RT and the magnetic disorder obtained at 2 K. We believe our results will motivate the scientific community to further study the interplay between the structural disorder and quantum fluctuations with temperature at the local level.

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Mechanism for transitions between ferromagnetic and antiferromagnetic orders in d-electron metallic magnets

Cited by 11 publications

References 68 publications

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

Novel Fe hydrides and magnetism in the Fe-H system at high pressures

Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point

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Mechanism for transitions between ferromagnetic and antiferromagnetic orders in d-electron metallic magnets

Cited by 11 publications

References 68 publications

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

Formation of short-range magnetic order and avoided ferromagnetic quantum criticality in pressurized LaCrGe3

Novel Fe hydrides and magnetism in the Fe-H system at high pressures

Structural and physical properties of Ni 1−x V x alloys around and away from quantum critical point

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Structural and physical properties of Ni 1−x V_x alloys around and away from quantum critical point