Upper critical magnetic field of the heavy-fermion superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">UPt</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Chen, J.W.; Lambert, S.E.; Maple, M. B.; Fisk, Z.; Smith, James L.; Stewart, G. R.; Willis, J.O.

doi:10.1103/physrevb.30.1583

Cited by 124 publications

(24 citation statements)

References 14 publications

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“…With a measured γ value of 420-450 mJ mol −1 K −2 in the normal state [282,53,233], UPt 3 was quickly compared to the other known heavy-fermion superconductors at the time (UBe 13 and CeCu 2 Si 2 ). Effective quasiparticle masses of m * /m 0 = 187 and 240 were estimated from analysis of the upper critical fields [283] and far infrared absorptivity [284], respectively, while analysis of quantum oscillation studies obtained effective masses as high as m * /m 0 = 120 [285,286]. These enhanced effective quasiparticle masses firmly classify UPt 3 as a heavyfermion superconductor.…”

Section: Uptmentioning

confidence: 98%

Unconventional superconductivity in heavy-fermion compounds

White

Thompson

Maple

2015

Physica C: Superconductivity and its Applications

126

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Over the past 35 years, research on unconventional superconductivity in heavy-fermion systems has evolved from the surprising observations of unprecedented superconducting properties in compounds that convention dictated should not superconduct at all to performing explorations of rich phase spaces in which the delicate interplay between competing ground states appears to support emergent superconducting states. In this article, we review the current understanding of superconductivity in heavy-fermion compounds and identify a set of characteristics that is common to their unconventional superconducting states. These core properties are compared with those of other classes of unconventional superconductors such as the cuprates and iron-based superconductors. We conclude by speculating on the prospects for future research in this field and how new advances might contribute towards resolving the long-standing mystery of how unconventional superconductivity works.

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Section: Uptmentioning

confidence: 98%

Unconventional superconductivity in heavy-fermion compounds

White

Thompson

Maple

2015

Physica C: Superconductivity and its Applications

126

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“…It can also still be argued, as with the specific heat anomaly at T~, that the gapless nature of the superconductivity is a dirt effect. We note in passing the large initial slope of H~2(T) (-17 T/K) [17] and the relatively large dependence of T~ and //ca on pressure [18].…”

Section: Superconductivity Of Upt 3 and Ube 13mentioning

confidence: 99%

Heavy fermion behavior in uranium compounds

Fisk

Smith

Ott³

et al. 1985

Journal of Magnetism and Magnetic Materials

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“…As k B T C * /ǫ F ≃ 2×10 −3 we deduce B spin ≃ 300 µT (ǫ F is computed using the data of Ref. [29]). This is consistent with the value given by Mineev for UBe 13 when rescaled for UPt 3 [27] and is much higher than our upper experimental bound.…”

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confidence: 99%

Absence of zero field muon spin relaxation induced by superconductivity in the B phase of UPt3

et al. 1995

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We present muon spin relaxation measurements performed on crystals of the heavy fermion superconductor UPt3. In zero applied field, contrary to a previous report, we do not observe an increase of the internal magnetic field in the lower superconducting phase (the B phase). Our result gives an experimental upper bound of the magnetic field that could be associated with the superconducting state.PACS numbers : 74.70. Tx, 75.20.Hr, 76.75.+i The unconventional nature of superconductivity in the hexagonal heavy fermion superconductor UPt 3 is now well established [1]. This was first convincingly demonstrated by the occurence in zero magnetic field of two superconducting phase transitions at T C+ ≃ 0.50 K and T C * ≃ 0.45 K. Despite intense experimental and theoretical activities, the nature of superconductivity in UPt 3 is still unknown. Even the question of the symmetry of the superconducting order parameter is not resolved [2,3].Recently Luke et al. have reported zero field muon spin relaxation (µSR) measurements which show that the relaxation rate increases when crossing T C * from above [4,5]. This observation has been taken as a proof that the B phase (the low temperature superconducting phase below T C * ) breaks time reversal symmetry and is characterized by triplet Cooper pairs. This remarkable result has attracted much interest [6,7,2,8,3].The physical properties of heavy fermion metals are well known to be extremely dependent on the sample quality. High quality crystals are now available. These two facts have been our original motivation for performing new µSR measurements, the results of which are presented in this letter.The samples were prepared from two large single crystals of UPt 3 grown by the Czochralski method under ultrahigh vacuum from zone-refined depleted uranium. The as-grown crystals were annealed for several days at 1200 • C -1300 • C (see Ref.[9]), and then spark-cut or wire-sawed. The cut plates were annealed for an additional week at 950 • C, improving the sharpness of the resistivity transition (an example is presented at Fig. 1 of Ref. [10]). The resistivity of our samples, measured on long samples (8 mm length, 0.3 × 0.4 mm 2 cross section) obeys ρ(T ) = ρ(0) + AT 2 perfectly below 1.1 K, with ρ c (0) = 0.28 µΩcm, ρ a (0) = 0.51 µΩcm and A c = 0.90 µΩcmK −2 , A a = 1.46 µΩcmK −2 for current parallel to c and a. These low residual resistivities, which are comparable with recently published values [11], are a proof of the high quality of our samples.The µSR measurements were carried out on two samples which differ by the orientation of the crystal axes relative to the sample plane : either c or a * (≡ b) is perpendicular to it. Each sample is a disk of ∼ 18 mm diameter and ∼ 0.4 mm thickness, comprising of a mosaic of ∼ 10 aligned slices of the same single crystal carefully glued to a 5N silver plate (40 × 40 mm 2 ). To ensure good thermal contact at low temperature, each slice is ultrasonically bonded to a gold wire clamped to the silver plate. This method allows to reach low tempera...

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Upper critical magnetic field of the heavy-fermion superconductorUPt3

Cited by 124 publications

References 14 publications

Unconventional superconductivity in heavy-fermion compounds

Unconventional superconductivity in heavy-fermion compounds

Heavy fermion behavior in uranium compounds

Absence of zero field muon spin relaxation induced by superconductivity in the B phase of UPt3

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