Specific heat of URu2Si2: Effect of pressure and magnetic field on the magnetic and superconducting transitions

Fisher, Robert A.; Kim, S.; Wu, Yi; Phillips, N. E.; McElfresh, M. W.; Torikachvili, M. S.; Maple, M. B.

doi:10.1016/0921-4526(90)90229-n

Cited by 80 publications

(63 citation statements)

References 9 publications

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“…21 The electrical resistivity 1,7 has been analyzed with a simple model 31 for the scattering of conduction electrons by magnetic excitations which show an energy gap with a quadratic dispersion. In the low-temperature limit (k B TӶ⌬), the electrical resisistivity is described by a considerably smaller and strongly anisotropic energy gap of ⌬ϭ73 K for I ʈ a and ⌬ϭ51 K for I ʈ c. 1,7 Inelastic neutronscattering measurements 5,23 indicate an even smaller gap.…”

Section: Evaluation Of the Excitation Gap And Discussionmentioning

confidence: 99%

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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: 99%

“…Previous specific-heat measurements in magnetic fields were performed in magnetic fields up to 5 T for single-crystalline samples 3 and 7 T for polycrystalline samples. 21 We will use the characteristic features of the magnetic excitation spectrum to describe the specific heat in the antiferromagnetically ordered state.…”

Section: Introductionmentioning

confidence: 99%

Specific heat of heavy-fermionURu2Si2in high magnetic fields

et al. 1997

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“…The fraction of electronic states involved in the superconductivity f, = [l -r,(O)ly,(O)] is -56% and -40% for samples A and B, respectively. It is noteworthy that previous measurements [27] of C(T) under pressure on polycrystalline URu,Si, samples yielded C,(T) = y,(O)T + BT2 below T,, with ~~(0) = 6.5 mJ/ mol K*, which is probably an artifact of the distribution of T,s in the polycrystalline material. This form does not provide a satisfactory description of the C,(T) data for the URu,Si, single crystal specimens reported here.…”

Section: Resultsmentioning

confidence: 88%

Evidence for unconventional superconductivity in single crystals of the antiferromagnetic heavy-electron compound URu2Si2

Maple

Dalichaouch

Lee

et al. 1991

Physica B: Condensed Matter

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“…The absolute value of χ(T ) is difficult to measure under pressure because of the small moment [99]. However, early measurements of C(T ) under pressure seem to suggest that the magnitude of the negative slope in C/T is diminished by pressure [100]. Consequently, there is little evidence for the presence of NFL behavior under pressure.…”

Section: Uru 2 Simentioning

confidence: 97%

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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Standard models for simple metals and insulators often fail for systems based on elements with unstable d-or f -electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero temperature by an external control parameter such as chemical composition, pressure or magnetic field. At the resulting quantum critical point (QCP), emergent phenomena, such as unconventional superconductivity and novel magnetic phases are frequently observed. The temperature and energy dependences of the physical properties are also found to deviate from expectations for a simple Fermi liquid. This "non-Fermi-liquid" (NFL) behavior is commonly manifested as weak power laws and logarithmic divergences in the physical properties at low temperatures and is often found in a V-shaped region near a QCP, which has become the "classic" QCP phase diagram. However, there is also a growing number of materials where the NFL behavior either occurs far away from the QCP, within an ordered phase, or may not be associated with any putative QCP. Thus, after nearly 20 years of research, it remains unknown whether NFL physics is universal, or if a multitude of unique subclasses exist. In this article, we review research that has primarily been carried out in our laboratory on systems that exhibit NFL behavior that does not conform to the "classic" QCP scenario.

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Specific heat of URu2Si2: Effect of pressure and magnetic field on the magnetic and superconducting transitions

Cited by 80 publications

References 9 publications

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Specific heat of heavy-fermionURu2Si2in high magnetic fields

Evidence for unconventional superconductivity in single crystals of the antiferromagnetic heavy-electron compound URu2Si2

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

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