Fermi surface properties and de Haas-van Alphen oscillation in both the normal and superconducting mixed states of URu2Si2

Ohkuni, H.; Inada, Y.; Tokiwa, Y.; Sakurai, K.; Settai, R.; Honma, T.; Haga, Yoshinori; Yamamoto, E.; Yamagami, Hiroshi; Takahashi, S.; Yanagisawa, Takashi

doi:10.1080/014186399256916

Cited by 82 publications

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“…This indicates that the electron mass is much heavier than hole mass. Moreover, the observed large anisotropies of the MR and the upper critical fields [11] indicates that the shape of the heavy electron band is elliptical [13]. We note that heavy electrons are consistent with the Hall effect which is dominated by light holes.…”

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confidence: 50%

“…The compensation necessarily indicates the presence of electron band, although it is not confirmed by the dHvA experiments [11,12]. The magnitude of the electronic specific heat [2] is five times larger than the estimation taking only the hole band assuming m h = 13m 0 [11]. This indicates that the electron mass is much heavier than hole mass.…”

mentioning

confidence: 82%

“…Such a low carrier density implies Fermi surfaces occupying only a small part of the Brillouin zone. According to de Haas-van Alphen (dHvA) experiments [11,12], one hole band with nearly spherical shape is reported. This band with Fermi momentum k F ≃ 1.8 × 10 9 m −1 contains ∼ 0.017 holes/U.…”

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confidence: 99%

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Exotic Superconducting Properties in the Electron-Hole-Compensated Heavy-Fermion “Semimetal”URu2Si2

et al. 2007

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We show that the charge and thermal transport measurements on ultraclean crystals of URu2Si2 reveal a number of unprecedented superconducting properties. The uniqueness is best highlighted by the peculiar field dependence of thermal conductivity including the first order transition at Hc2 with a reduction of entropy flow. This is a consequence of multi-band superconductivity with compensated electronic structure in the hidden order state of this system. We provide strong evidence for a new type of unconventional superconductivity with two distinct gaps having different nodal topology.The heavy-Fermion compound URu 2 Si 2 has mystified researchers since the superconducting state (T c = 1.5 K) is embedded within the "hidden order" phase (T h = 17.5 K) [1,2,3]. Although several exotic order parameters have been proposed for the hidden order phase [4], it is not identified yet. According to several experimental observations, most of the carriers disappear below T h resulting in a density one order of magnitude smaller than in other heavy-Fermion superconductors [5,6,7]. Superconductivity with such a low density is remarkablesince the superfluid density is very low in some way reminiscent of underdoped cuprates. Moreover, pressure studies reveal that the superconductivity coexists with the hidden order but is suppressed by antiferromagnetic ordering [8].In this Letter, using ultraclean single crystals, we report various anomalous superconducting properties in URu 2 Si 2 . We show that a peculiar electronic structure appearing below the hidden order transition provides an intriguing stage on which a new type of unconventional superconducting state appears.Single crystals of URu 2 Si 2 were grown by the Czochralski pulling method in a tetra-arc furnace. The welldefined superconducting transition was confirmed by the specific heat measurements. The thermal conductivity κ was measured using a standard four-wire steady state method along the a-axis (heat current q a). The contact resistance at low temperatures is less than 10 mΩ.We first discuss the electronic structure below T h . Figure 1 shows the temperature dependence of the resistivity ρ along the a-axis and Hall coefficient R H (solid circles) defined as R H ≡ dρxy dH at H → 0 T for H c in the tetragonal crystal structure. In zero field, ρ depends on T as ρ = ρ 0 + AT 2 below 6 K down to T c . The exceptionally low residual resistivity ρ 0 = 0.48 µΩ cm and large residual resistivity ratio RRR = 670 attest the highest crystal quality currently achievable. R H exhibits an eight-fold increase below T h and attains a T -independent value at low temperatures, associated with a strong reduction of the carrier density. Most remarkably, the magnetoresistance (MR) increases with decreasing temperature and becomes extremely large at the lowest temperatures. The inset of Fig.

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Exotic Superconducting Properties in the Electron-Hole-Compensated Heavy-Fermion “Semimetal”URu2Si2

et al. 2007

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“…Although dHvA data seem to be explained by LDA calculations for some heavy fermion uranium materials, e.g. UPt [36,37], this is not the case for 3 URu Si [38,39]. The antiferromagnetic phase tran- 2 2 sition at 17.5 K in URu Si , and a possible associ- 2 2 ated change in the Fermi surface, complicates the comparison of LDA, dHvA and ARPES.…”

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Comparative study of the electronic structure of XRu2Si2: probing the Anderson lattice

Denlinger

Gweon

Allen

et al. 2001

Journal of Electron Spectroscopy and Related Phenomena

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“…It is connected, as is shown in our study, to a relatively flat band (feature 4) ostensibly of predominant 5f character. Finally, hole-like states (feature 5) that cross the Fermi level E F at k x ≈ 0.54 π/a form propeller-shaped Fermi surface (FS) sheets, also observed in quantum oscillation measurements [17,18].…”

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Formation of the Coherent Heavy Fermion Liquid at the Hidden Order Transition inURu2Si2

et al. 2013

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In this article we present high-resolution angle-resolved photoemission (ARPES) spectra of the heavy-fermion superconductor URu2Si2. Measurements as a function of both excitation energy and temperature allow us to disentangle a variety of spectral features, revealing the evolution of the low energy electronic structure across the hidden order transition. Already above the hidden order transition our measurements reveal the existence of weakly dispersive states below the Fermi level that exhibit a large scattering rate. Upon entering the hidden order phase, these states transform into a coherent heavy fermion liquid that hybridizes with the conduction bands.

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Fermi surface properties and de Haas-van Alphen oscillation in both the normal and superconducting mixed states of URu2Si2

Cited by 82 publications

References 0 publications

Exotic Superconducting Properties in the Electron-Hole-Compensated Heavy-Fermion “Semimetal”URu2Si2

Exotic Superconducting Properties in the Electron-Hole-Compensated Heavy-Fermion “Semimetal”URu2Si2

Comparative study of the electronic structure of XRu2Si2: probing the Anderson lattice

Formation of the Coherent Heavy Fermion Liquid at the Hidden Order Transition inURu2Si2

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