Quantum critical point and unusual phase diagram in the itinerant-electron metamagnet UCoAl

Kimura, Noriaki; Kabeya, Noriyuki; Aoki, Haruyoshi; Ohyama, Kenji; Maeda, Moe; Fujii, Hisashi; Kogure, M.; Asai, Toshihiro; Komatsubara, T.; Yamamura, Tomoo; Satoh, Ichiro

doi:10.1103/physrevb.92.035106

Cited by 26 publications

(20 citation statements)

References 28 publications

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“…Besides UGe 2 and LaCrGe 3 , two ferromagnetic states have also been reported in ZrZn 2 [34]. In UCoAl, the anomaly corresponding to the field induced transition to the FM state shows two peaks in the ac susceptibility [35] and two kinks forming a plateau in electrical resistivity [36]. Two peaks in the ac susceptibility have also been reported in the metamagnetic transition of Sr 3 Ru 2 O 7 [37].…”

Section: Quantum Wingmentioning

confidence: 87%

“…Similar experimental studies have revealed other wing-structure phase diagrams in UGe 2 [8,30,31] (also shown in Fig. 6 for comparison), Sr 3 Ru 2 O 7 [37], ZrZn 2 [9], UCoAl [35,36,40]. The behavior near the tricritical point could not be studied in Sr 3 Ru 2 O 7 and UCoAl because those compounds are already in the paramagnetic regime at ambient pressure.…”

Section: Quantum Wingmentioning

confidence: 92%

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Ferromagnetic quantum criticality: New aspects from the phase diagram of LaCrGe3

Taufour

Kaluarachchi

Bud’ko

et al. 2018

Physica B: Condensed Matter

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Recent theoretical and experimental studies have shown that ferromagnetic quantum criticality is always avoided in clean systems. Two possibilities have been identified. In the first scenario, the ferromagnetic transition becomes of the first order at a tricritical point before being suppressed. A wing structure phase diagram is observed indicating the possibility of a new type of quantum critical point under magnetic field. In a second scenario, a transition to a modulated magnetic phase occurs. Our recent studies on the compound LaCrGe 3 illustrate a third scenario where not only a new magnetic phase occurs, but also a change of order of the transition at a tricritical point leading to a wing-structure phase diagram. Careful experimental study of the phase diagram near the tricritical point also illustrates new rules near this type of point.

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Section: Quantum Wingmentioning

confidence: 87%

Section: Quantum Wingmentioning

confidence: 92%

Ferromagnetic quantum criticality: New aspects from the phase diagram of LaCrGe3

Taufour

Kaluarachchi

Bud’ko

et al. 2018

Physica B: Condensed Matter

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“…The ferromagnetic UTX (T = late transition d-electron metal, X = p-electron element) compounds, which crystallize in the hexagonal ZrNiAl-type structure (space group P-62m) and exhibit strong uniaxial magnetocrystalline anisotropy [1], have recently been going through a renaissance of interest due to the possible presence of quantum phase transitions (QPT) connected with the loss of magnetism [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal history on magnetism in UCoGa

Opletal

Proschek

Vondráčková

et al. 2019

Journal of Magnetism and Magnetic Materials

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Single crystals of UCoGa have been grown in different conditions and subsequently annealed in order to provide a collection of samples representing various quality as to concentration of lattice defects. The different sample quality "grades" have been characterized by values of residual electrical resistivity. Correlations of magnetic parameters (coercive field, Curie temperature) with residual resistivity have been determined and domain-wall pinning by crystal defects has been confirmed as the underlying mechanism of coercive field in strongly anisotropic ferromagnets.

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“…The very strong uniaxial magnetic anisotropy locks the U magnetic moments aligned along the c-axis of the hexagonal structure whereas only Pauli paramagnetism is observed in the perpendicular directions. Several these compounds order ferromagnetically providing a playground for investigation of the critical behavior of itinerant ferromagnets [2][3][4][5]. Contrary to the case of antiferromagnetism where novel states are result of the presence of quantum critical point (QCP; see e.g.…”

Section: Introductionmentioning

confidence: 99%

Pressure evolution of magnetism in URhGa

et al. 2018

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In this paper, we report the results of an ambient and high pressure study of a 5f-electron ferromagnet URhGa. The work is focused on measurements of magnetic and thermodynamic properties of a single crystal sample and on the construction of the p-T phase diagram. Diamond anvil cells were employed to measure the magnetization and electrical resistivity pressures up to ~ 9 GPa. At ambient pressure, URhGa exhibits collinear ferromagnetic ordering of uranium magnetic moments μU ~ 1.1 μB (at 2 K) aligned along the c-axis of the hexagonal crystal structure below the Curie temperature TC = 41K. With the application of pressure up to 5GPa the ordering temperature TC initially increases whereas the saturated moment slightly decreases. The rather unexpected evolution is put in the context of the UTX family of compounds.

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Quantum critical point and unusual phase diagram in the itinerant-electron metamagnet UCoAl

Cited by 26 publications

References 28 publications

Ferromagnetic quantum criticality: New aspects from the phase diagram of LaCrGe3

Ferromagnetic quantum criticality: New aspects from the phase diagram of LaCrGe3

Effect of thermal history on magnetism in UCoGa

Pressure evolution of magnetism in URhGa

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