Magnetic fluctuations in heavy-fermion metals

Mason, T.E.; Petersen, Thorben; Aeppli, G.; Buyers, W. J. L.; Bücher, E.; Garrett, J. D.; Menovsky, A.A.

doi:10.1016/0921-4526(95)00051-a

Cited by 11 publications

(3 citation statements)

References 25 publications

(27 reference statements)

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“…Above T N a strong field dependence is observed with a crossing of the s m /R curves in zero field and in a magnetic field of 17.5 T. The magnetic entropy in the paramagnetic state (TϾT N ) does not correspond to a simple Schottky curve for two dispersionless crystal-field levels. Inelastic neutron-scattering measurements 5,23,35 confirm the absence of well-defined crystal-field levels. For TϾT N the magnetic excitations at Qϭ͑1 0 0͒ become overdamped, while the magnetic excitations at Qϭ͑1.4 0 0͒ persist around 4.5 meV ͑52 K͒.…”

Section: Evaluation Of the Excitation Gap And Discussionmentioning

confidence: 90%

Specific heat of heavy-fermionURu2Si2in high magnetic fields

et al. 1997

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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.

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Section: Evaluation Of the Excitation Gap And Discussionmentioning

confidence: 90%

Specific heat of heavy-fermionURu2Si2in high magnetic fields

et al. 1997

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“…Mason 24) but without a large precision and more important without taking into account the magnetic continuum described by a quasi-elastic function and revealed by our recent inelastic polarized neutron scattering. From their study they concluded that the gap follows a singlet ground state model but moreover that the evolution of the susceptibility χ(Q 0 , ω = 0) shows a large enhancement at T 0 .…”

Section: Low Energy Study At Qmentioning

confidence: 99%

Precise Study of the Resonance at Q₀=(1,0,0) in URu₂Si₂

et al. 2010

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New inelastic neutron scattering experiments have been performed on URu 2 Si 2 with special focus on the response at Q 0 =(1,0,0), which is a clear signature of the hidden order (HO) phase of the compound. With polarized inelastic neutron experiments, it is clearly shown that below the HO temperature (T 0 = 17.8 K) a collective excitation (the magnetic resonance at E 0 ≃ 1.7 meV) as well as a magnetic continuum co-exist. Careful measurements of the temperature dependence of the resonance lead to the observation that its position shifts abruptly in temperature with an activation law governed by the partial gap opening and that its integrated intensity has a BCS-type temperature dependence. Discussion with respect to recent theoretical development is made.

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“…On the other hand, the superconducting transition temperatures for UPd 2 Al 3 and UNi 2 Al 3 occur below, at about T c ∼ 2.0 and ∼1.0 K, respectively. [1][2][3][4][5][6][7][8] Other alloys with uranium and transition metals also present superconductivity or magnetism, but both phenomena are independent. One interesting case is the UFe x family of compounds.…”

Section: Introductionmentioning

confidence: 99%

CRYSTALLINE STRUCTURE AND PHYSICAL PROPERTIES OF UCo₂Al₃

Verdín

Escudero

2004

Int. J. Mod. Phys. B

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Some intermetallic compounds which contain uranium or cerium present heavy fermion characteristics. Take, for example, in the UM 2 Al 3 ( M = Pd , Ni ) family, superconductivity and magnetism coexist and present heavy fermion behavior. This work presents the crystallographic characteristics and physical properties of a new compound of this family; the intermetallic compound UCo 2 Al 3. Our initial crystallographic studies performed in a small single crystal show that the structure is hexagonal and similar to the UNi 2 Al 3 and UPd 2 Al 3 parent compounds. The space group is P6/mmm with a=5.125 Å and c=4.167 Å crystalline parameters. Measurements of resistivity and magnetization performed on the single crystal reveal that the compound is not superconducting when measured at about 1.8 K. The compound is highly anisotropic and features related to Kondo-like behavior are observed. A weak ferromagnetic transition is observed at a temperature of about 20 K.

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Magnetic fluctuations in heavy-fermion metals

Cited by 11 publications

References 25 publications

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Precise Study of the Resonance at Q₀=(1,0,0) in URu₂Si₂

CRYSTALLINE STRUCTURE AND PHYSICAL PROPERTIES OF UCo₂Al₃

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Magnetic fluctuations in heavy-fermion metals

Cited by 11 publications

References 25 publications

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Precise Study of the Resonance at Q0=(1,0,0) in URu2Si2

CRYSTALLINE STRUCTURE AND PHYSICAL PROPERTIES OF UCo2Al3

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Precise Study of the Resonance at Q₀=(1,0,0) in URu₂Si₂

CRYSTALLINE STRUCTURE AND PHYSICAL PROPERTIES OF UCo₂Al₃