Universality and critical behavior at the critical endpoint in the itinerant-electron metamagnet UCoAl

Karube, Kosuke; Hattori, T.; Kitagawa, Shunsaku; Ishida, K.; Kimura, Noriaki; Komatsubara, T.

doi:10.1103/physrevb.86.024428

Cited by 29 publications

(34 citation statements)

References 22 publications

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“…One therefore expects that |d(∆C τ )/dH(θ)|, the field derivative of the OP, becomes divergent on the line connecting TCP and QWCP [37]. Unlike the expectation, however, the peak amplitude of |d(∆C τ )/dH(θ)| of URhGe decreases progressively as θ increases, making it somewhat difficult to define the wing edge from these data.…”

Section: Discussionmentioning

confidence: 76%

Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements

et al. 2017

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High-precision angle-resolved dc magnetization and magnetic torque studies were performed on a single-crystalline sample of URhGe, an orthorhombic Ising ferromagnet with the c axis being the magnetization easy axis, in order to investigate the phase diagram around the ferromagnetic (FM) reorientation transition in a magnetic field near the b axis. We have clearly detected first-order transition in both the magnetization and the magnetic torque at low temperatures, and determined detailed profiles of the wing structure of the three-dimensional T -H b -Hc phase diagram, where Hc and H b denotes the field components along the c and the b axes, respectively. The quantum wing critical points are located at µ0Hc ∼ ±1.1 T and µ0H b ∼13.5 T. Two second-order transition lines at the boundaries of the wing planes rapidly tend to approach with each other with increasing temperature up to ∼ 3 K. Just at the zero conjugate field (Hc = 0), however, a signature of the first-order transition can still be seen in the field derivative of the magnetization at ∼ 4 K, indicating that the tricritical point exists in a rather high temperature region above 4 K. This feature of the wing plane structure is consistent with the theoretical expectation that three second-order transition lines merge tangentially at the triciritical point.

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Section: Discussionmentioning

confidence: 76%

Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements

et al. 2017

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“…Studies of the magnetostriction, magnetoresistivity (Aoki et al, 2011a), nuclear magnetic resonance (Karube et al, 2012) and thermopower (PalacioMorales et al, 2013) indicate that the field-induced firstorder transition terminates in a critical point at a temperature T 0 = 11 K at ambient pressure, as illustrated in Fig. 9: ∆L(H)/L shows a step-like jump at H m for T < T 0 which becomes smooth for T ≥ T 0 .…”

Section: Uranium-based Compoundsmentioning

confidence: 97%

Metallic quantum ferromagnets

et al. 2016

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We give an overview of quantum phase transitions (QPTs) in metallic ferromagnets, discussing both experimental and theoretical aspects. These QPTs can be classified with respect to the presence and strength of quenched disorder: Clean systems generically show a discontinuous, or first-order, QPT from a ferromagnetic to a paramagnetic state as a function of some control parameter, as predicted by theory. Disordered systems are much more complicated, depending on the disorder strength and the distance from the QPT. In many disordered materials the QPT is continuous, or second order, and Griffiths-phase effects coexist with QPT singularities near the transition. In other systems the transition from the ferromagnetic state at low temperatures is to a different type of long-range order, such as an antiferromagnetic or a spin-density-wave state. In still other materials a transition to a state with glass-like spin dynamics is suspected. The review provides a comprehensive discussion of the current understanding of these various transitions, and of the relation between experiment and theory.

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“…At ambient pressure, its ground state is paramagnetic (PM), but it undergoes a first-order metamagnetic transition by small magnetic fields only applied along its easy magnetization axis (c axis) of µ 0 H c ∼ 0.6 T at low temperatures. The first-order transition changes to crossover above the CEP at (T, µ 0 H c ) ∼ (12 K, 1.0 T) [6][7][8][9][10][11] . Under hydrostatic pressure (P hydro ), the metamagnetic transition field increases 6 and the CEP reaches the QCEP at (T, µ 0 H c , P hydro ) ∼ (0 K, 7 T, 1.5 GPa) 7,8 .…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic critical behavior inU(Co1−xFex)Al(0≤x≤0.02
Karube
¹
,
Hattori
²
,
Ishida
³

et al. 2015
Phys. Rev. B
Self Cite
10
2
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0
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In order to investigate physical properties around a ferromagnetic (FM) quantum transition point and a tricritical point (TCP) in the itinerant-electron metamagnetic compound UCoAl, we have performed the 59 Co nuclear quadrupole resonance (NQR) measurement for the Fe-substituted U(Co1−xFex)Al (x = 0, 0.5, 1, and 2%) in zero external magnetic field. The Fe concentration dependence of 59 Co-NQR spectra at low temperatures indicates that the first-order FM transition occurs at least above x = 1%. The magnetic fluctuations along the c axis detected by the nuclear spin-spin relaxation rate 1/T2 exhibit an anomaly at Tmax ∼ 20 K and enhance with increasing x. These results are in good agreement with theoretical predictions and indicate the presence of prominent critical fluctuations at the TCP in this system.

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Universality and critical behavior at the critical endpoint in the itinerant-electron metamagnet UCoAl

Cited by 29 publications

References 22 publications

Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements

Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements

Metallic quantum ferromagnets

Ferromagnetic critical behavior inU(Co1−xFex)Al(0≤x≤0.02
Karube
¹
,
Hattori
²
,
Ishida
³

et al. 2015
Phys. Rev. B
Self Cite
10
2
5
0
View full text Add to dashboard Cite

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Universality and critical behavior at the critical endpoint in the itinerant-electron metamagnet UCoAl

Cited by 29 publications

References 22 publications

Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements

Wing structure in the phase diagram of the Ising ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements

Metallic quantum ferromagnets

Ferromagnetic critical behavior inU(Co1−xFex)Al(0≤x≤0.02Karube1, Hattori2, Ishida3 et al. 2015Phys. Rev. BSelf Cite10250View full textAdd to dashboardCite

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Ferromagnetic critical behavior inU(Co1−xFex)Al(0≤x≤0.02
Karube
¹
,
Hattori
²
,
Ishida
³

et al. 2015
Phys. Rev. B
Self Cite
10
2
5
0
View full text Add to dashboard Cite