Field-Induced Destruction of Heavy Fermion State in URu<sub>2</sub>Si<sub>2</sub>

Sugiyama, Kiyohiro; Fuke, Hiroyuki; Kindo, Koichi; Shimohata, Kenji; Menovsky, A.A.; Mydosh, J. A.; Date, Muneyuki

doi:10.1143/jpsj.59.3331

Cited by 92 publications

(56 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We get a single-step metamagnetic transition distributed over the width of the high-field quadrupolar phase. The overall height of the step is right, but we do not recover the three-step structure of the transition observed by Sugiyama et al [37].…”

Section: Crystal Field Modelcontrasting

confidence: 99%

Group theory and octupolar order inURu2Si2

2005

View full text Add to dashboard Cite

Recent experiments on URu 2 Si 2 show that the low-pressure hidden order is non-magnetic but it breaks time reversal invariance. Restricting our attention to local order parameters of 5f 2 shells, we find that the best candidate for hidden order is staggered order of either T β z or T xyz octupoles.Group theoretical arguments for the effect of symmetry-lowering perturbations (magnetic field, mechanical stress) predict behavior in good overall agreement with observations. We illustrate our general arguments on the example of a five-state crystal field model which differs in several details from models discussed in the literature. The general appearance of the mean field phase diagram agrees with the experimental results. In particular, we find that a) at zero magnetic field, there is a first-order phase boundary between octupolar order and large-moment antiferromagnetism with increasing hydrostatic pressure; b) arbitrarily weak uniaxial pressure induces staggered magnetic moments in the octupolar phase; and c) a new phase with different symmetry appears at large magnetic fields.

show abstract

Section: Crystal Field Modelcontrasting

confidence: 99%

Group theory and octupolar order inURu2Si2

2005

View full text Add to dashboard Cite

show abstract

“…Electrical resistivity 7 and point-contact spectroscopy measurements 8 show a similar energy gap, indicating a strong scattering of the conduction electrons by the magnetic excitations. Magnetization measurements in high magnetic fields 9,10 show a suppression of the heavy-fermion state in three subsequent steps at 35.8, 37.3, and 39.4 T for fields along the easy axis (B ʈ c). These transitions have been confirmed in high-field measurements of the magnetoresistance and Hall coefficient.…”

Section: Introductionmentioning

confidence: 99%

Specific heat of heavy-fermionURu2Si2in high magnetic fields

et al. 1997

View full text Add to dashboard Cite

We have performed specific-heat measurements on the heavy-fermion superconductor URu 2 Si 2 in magnetic fields up to 17.5 T. A sharp peak in the specific heat signals the antiferromagnetic transition at T N ϭ17.5 K, which shifts to lower temperatures in applied magnetic fields. In order to describe the specific heat below T N , we have used the characteristic features of the excitation spectrum measured by neutron scattering. The relative field dependence of the antiferromagnetic transition temperature T N and the energy gap ⌬ in the magnetic excitation spectrum can be described by a single scaling relation of the form ͓1Ϫ(B/B 0 ) 2 ͔. The scaling field of 48.5 T is close to the metamagnetic transition field B*ϭ40 T, where the heavy-fermion state is suppressed.

show abstract

“…The likely Kondo physics apparent in the resistivity upturn below 12 K is somewhat reminiscent of URu 2 Si 2 , [12][13][14][15][16] which exhibits a substantial Kondo effect, with a Kondo temperature 17 of several hundred Kelvin. In UMn 2 Ge 2 , however, we estimate a much smaller Kondo temperature of order 1 K, which is roughly consistent with the 10 K value obtained from the upturn of the very low-temperature resistance, considering the exponential dependence of T K .…”

mentioning

confidence: 98%

Magnetocrystalline anisotropy inUMn2Ge2and related Mn-based actinide ferromagnets

et al. 2015

View full text Add to dashboard Cite

We present magnetization isotherms in pulsed magnetic fields up to 62 Tesla, supported by first principles calculations, demonstrating a huge uniaxial magnetocrystalline anisotropy energy -approximately 20 MJ/m 3 -in UMn 2 Ge 2 . This large anisotropy results from the extremely strong spin-orbit coupling affecting the uranium 5 f electrons, which in the calculations exhibit a substantial orbital moment exceeding 2 Bohr magnetons. We also find from theoretical calculations that a number of isostructural Mn-actinide compounds are expected to have similarly large anisotropy.Introduction. Uranium-3d transition metal compounds present a wide range of behaviors, ranging from superconductivity in U 6 Mn and U 6 Fe 1 , ferromagnetism with T c above room temperature in UMn 2 Ge 2 2 , antiferromagnetism and heavy-fermion behavior in UNi 4 B, 3 , and the unexpected paramagnetism 4 in UMn 2 . All these materials appear to present an interplay across energy scales, in particular in which the uranium spin-orbit coupling rivals and sometimes exceeds typical energy scales such as the crystal field splitting and electronic band width.

show abstract

Field-Induced Destruction of Heavy Fermion State in URu₂Si₂

Cited by 92 publications

References 25 publications

Group theory and octupolar order inURu2Si2

Group theory and octupolar order inURu2Si2

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Magnetocrystalline anisotropy inUMn2Ge2and related Mn-based actinide ferromagnets

Contact Info

Product

Resources

About

Field-Induced Destruction of Heavy Fermion State in URu2Si2

Cited by 92 publications

References 25 publications

Group theory and octupolar order inURu2Si2

Group theory and octupolar order inURu2Si2

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Magnetocrystalline anisotropy inUMn2Ge2and related Mn-based actinide ferromagnets

Contact Info

Product

Resources

About

Field-Induced Destruction of Heavy Fermion State in URu₂Si₂