NMR/NQR studies of U-123 type heavy fermion compounds

Tou, Hideki; Kitaoka, Y.; Kamatsuka, T.; Geibel, C.; Steglich, F.; Süllow, S.; Mydosh, J. A.

doi:10.1016/s0921-4526(96)00721-1

Cited by 14 publications

(8 citation statements)

References 11 publications

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“…In any case, the superconductivity clearly shows numerous hints for unconventional pairing. For instance, NMR measurements show the absence of a Hebel-Slichter peak at T s (Kyogaku et al, 1993), where the decrease of 1/T 1 in the superconducting state is consistent with line nodes (Tou et al, 1997). The Knight shift remains, moreover, unchanged in the superconducting state characteristic of spin-triplet pairing .…”

Section: A Upd2al3mentioning

confidence: 66%

Superconducting phases off-electron compounds

2009

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Intermetallic compounds containing f-electron elements display a wealth of superconducting phases, that are prime candidates for unconventional pairing with complex order parameter symmetries. For instance, superconductivity has been found at the border of magnetic order as well as deep within ferro-and antiferromagnetically ordered states, suggesting that magnetism may promote rather than destroy superconductivity. Superconductivity near valence transitions, or in the vicinity of magneto-polar order are candidates for new superconductive pairing interactions such as fluctuations of the conduction electron density or the crystal electric field, respectively. The experimental status of the study of the superconducting phases of f-electron compounds is reviewed.

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Section: A Upd2al3mentioning

confidence: 66%

Superconducting phases off-electron compounds

2009

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“…On the other hand, angle-resolved magnetothermal transport measurements support the presence of a line node in ∆( k) for UPd 2 Al 3 [239]. NMR measurements provide additional support for an anisotropic energy gap containing a line node [240].…”

Section: Introductionmentioning

confidence: 78%

Unconventional superconductivity in heavy-fermion compounds

White

Thompson

Maple

2015

Physica C: Superconductivity and its Applications

130

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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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“…Due to the greater availability of quality samples of UPd2Al3, research has tended to focus primarily on this compound. As well, the lower Tc in UNi2Al3 has resulted in power law investigations over much too limited a range (e. g. between 0.5 and 1.0 K for 1/T1 Tou et al [175]) to allow any conclusions about nodal behavior (section 2.1.12. ).…”

Section: Uni2al3 / Upd2al3mentioning

confidence: 99%

Unconventional superconductivity

Stewart

2017

Advances in Physics

220

165

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Abstract:"Conventional" superconductivity, as used in this review, refers to electron-phonon coupled superconducting electron pairs described by BCS theory. Unconventional superconductivity refers to superconductors where the Cooper pairs are not bound together by phonon-exchange but instead by exchange of some other kind, e. g. spin fluctuations in a superconductor with magnetic order either coexistent or nearby in the phase diagram. Such unconventional superconductivity has been known experimentally since heavy fermion CeCu2Si2, with its strongly correlated 4f electrons, was discovered to superconduct below 0.6 K in 1979. Since the discovery of unconventional superconductivity in the layered cuprates in 1986, the study of these materials saw Tc jump to 164 K by 1994. Further progess in high temperature superconductivity would be aided by understanding the cause of such unconventional pairing. This review compares the fundamental properties of 9 unconventional superconducting classes of materialsfrom 4f-electron heavy fermions to organic superconductors to classes where only three known members exist to the cuprates with over 200 examples -with the hope that common features will emerge to help theory explain (and predict!) these phenomena. In addition, three new emerging classes of superconductors (topological, interfacial -e. g. FeSe on SrTiO3, and H2S under high pressure) are briefly covered, even though their "conventionality" is not yet fully determined.

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NMR/NQR studies of U-123 type heavy fermion compounds

Cited by 14 publications

References 11 publications

Superconducting phases off-electron compounds

Superconducting phases off-electron compounds

Unconventional superconductivity in heavy-fermion compounds

Unconventional superconductivity

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