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Ito, T.; Fudamoto, Y.; Fukaya, A.; Gat-Malureanu, I. M.; Larkin, M.; Russo, Peter L.; Savici, A. T.; Uemura, Yohei; Groves, Kevin; Breslow, Ronald; Hotehama, Ken-ichi; Yamanaka, Shōji; Kyriakou, P. P.; Rovers, M. T.; Luke, G. M.; Kojima, Kenji

doi:10.1103/physrevb.69.134522

Cited by 49 publications

(45 citation statements)

References 53 publications

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“…For Li x ZrNCl, Hiraishi et al have found that the anisotropy becomes stronger with increasing x [46], which is consistent with the specific heat measurements. Strongcoupling superconductivity was also confirmed by µSR experiments for both Li x ZrNCl and Li x (THF) y HfNCl [46,47]…”

Section: µSr and Tunneling Measurementsmentioning

confidence: 61%

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Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M= Ti, Zr, Hf; X= Cl, Br, I)

Kasahara

Kuroki

Yamanaka

et al. 2015

Physica C: Superconductivity and its Applications

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Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I) AbstractIn this review, we present a comprehensive overview of superconductivity in electron-doped metal nitride halides MNX (M = Ti, Zr, Hf; X = Cl, Br, I) with layered crystal structure and two-dimensional electronic states. The parent compounds are band insulators with no discernible long-range ordered state. Upon doping tiny amount of electrons, superconductivity emerges with several anomalous features beyond the conventional electron-phonon mechanism, which stimulate theoretical investigations. We will discuss experimental and theoretical results reported thus far and compare the electron-doped layered nitride superconductors with other superconductors.

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Section: µSr and Tunneling Measurementsmentioning

confidence: 61%

“…s /m * , rather than the 3D counter part, n 3D s /m * , is the dominant factor for determining the high T c in the nitride superconductors, and suggested similarity to overdoped cuprates [47], implying 2D nature and unconventional superconductivity in the nitride superconductors.…”

Section: Dmentioning

confidence: 97%

Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M= Ti, Zr, Hf; X= Cl, Br, I)

Kasahara

Kuroki

Yamanaka

et al. 2015

Physica C: Superconductivity and its Applications

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“…SR measurements (T. Ito et al [639]) on -Lix(Hf,Zr)NCl, both with and without co-intercalated THF/PC, were interpreted as strongly favoring 2D superconductivity with only weak interlayer coupling. (This is of course in contrast to the data for -TiNCl in Fig.…”

Section: Superconducting Properties That Impinge On Possible Ucs -Formmentioning

confidence: 99%

Unconventional superconductivity

Stewart

2017

Advances in Physics

211

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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“…Nuclear magnetic resonance (NMR) 11 and muon spin relaxation measurements 12,13 have suggested the quasi two-dimensional superconductors. Regardless of the relatively high T c , the T -linear specific heat has been found to be very small (∼ 1mJ/mol 2 ).…”

Section: Introductionmentioning

confidence: 99%

Band and Mott Insulators and Superconductivity in Honeycomb-Lattice Ionic-Hubbard Model

Watanabe

Ishihara

2013

J. Phys. Soc. Jpn.

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Motivated by superconductivity (SC) in layered nitrides, we study an ionic-Hubbard model on a honeycomb lattice, which consists of two sublattices with an energy-level offset, by using an optimization variational Monte Carlo method. Parameter values for the Coulomb interaction and the energy-level offset, to realize a band insulator in non-doped state, are evaluated, and the SC state is investigated in a carrier-doped band insulator. It is found that, in a weakly doped band insulator, spin fluctuation remains and the spin-singlet d-wave SC state is realized. Present results support an unconventional spin-singlet SC state suggested by the experimental observations in layered nitrides.

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Two-dimensional nature of superconductivity in the intercalated layered systemsLixHfNClandLi

Abstract: We report muon spin relaxation (µSR) and magnetization measurements, together with synthesis and characterization, of the Li-intercalated layered superconductors Li x HfNCl and Li x ZrNCl with/without co-intercalation of THF

Cited by 49 publications

References 53 publications

Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M= Ti, Zr, Hf; X= Cl, Br, I)

Unconventional superconductivity in electron-doped layered metal nitride halides MNX (M= Ti, Zr, Hf; X= Cl, Br, I)

Unconventional superconductivity

Band and Mott Insulators and Superconductivity in Honeycomb-Lattice Ionic-Hubbard Model

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