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Sun, C. P.; Lin, Jiunn‐Yuan; Mollah, S.; Ho, Ping-Luen; Yang, H. D.; Hsu, Fu-Chiun; Liao, Y. C.; Wu, M. K.

doi:10.1103/physrevb.70.054519

Cited by 46 publications

(29 citation statements)

References 36 publications

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“…Third, the temperature dependence of the superconducting energy gap can be fitted well with the BCS theory (Fig. 2d), and the observed 2D 0 /k B T c ¼ 4 (D 0 ¼ 1.93 meV) is consistent with previous reports 6,9 , indicating that LTO is a medium-coupling BCS superconductor. Moreover, a simple relation of 2 , can be used to scale the field-dependent energy gap at different temperatures, for example, T ¼ 2, 6, 10 K (Fig.…”

Section: Resultssupporting

confidence: 73%

“…In the Ca 2-x Na x CuO 2 Cl 2 (x ¼ 0.14), the field dependence scales as BlogB, suggested to be an indication of a dirty d-wave superconductor 40 . Previous specific heat experiments have suggested that LTO is an s-wave superconductor 6 . Thus, based on the lack of departure from the linearly dependent ZBC, we conclude that LTO is not likely to be a multiband superconductor.…”

Section: Resultsmentioning

confidence: 99%

“…Since most of the earlier studies were carried out on polycrystalline samples, the parameters such as carrier density (n), effective mass (m*) and density of states (N(E F ): states per eV atom) are from previous magnetic susceptibility measurements using nearly free electron approximations 7 . The mean free path (l) was calculated from the specific heat data 6 . We compare the Ginzburg-Landau coherence length (xGL) to the value reported by another thin film study 16 , and the superconducting energy gap (D) to the value obtained from an Andreev study on polycrystalline samples 9 .…”

Section: Resultsmentioning

confidence: 99%

“…1). Although its T c can be described by band-structure calculations using the McMillan formula with a weak electron-phonon coupling constant (l el-ph B0.6; refs 3,4), an enhanced density of states or an equivalently larger coupling constant has been unveiled from specific-heat 5,6 and magnetic susceptibility measurements 7 . Other measurements like nuclear magnetic resonance 8 , point contact Andreev reflection spectroscopy 9 , and resonant inelastic soft-x-ray scattering 10 have revealed the significance of d-d electron correlations.…”

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confidence: 99%

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Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Jin

Zhang

et al. 2015

Nat Commun

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LiTi 2 O 4 is a unique compound in that it is the only known spinel oxide superconductor. The lack of high quality single crystals has thus far prevented systematic investigations of its transport properties. Here we report a careful study of transport and tunnelling spectroscopy in epitaxial LiTi 2 O 4 thin films. An unusual magnetoresistance is observed which changes from nearly isotropic negative to prominently anisotropic positive as the temperature is decreased. We present evidence that shows that the negative magnetoresistance likely stems from the suppression of local spin fluctuations or spin-orbit scattering centres. The positive magnetoresistance suggests the presence of an orbital-related state, also supported by the fact that the superconducting energy gap decreases as a quadratic function of magnetic field. These observations indicate that the spin-orbital fluctuations play an important role in LiTi 2 O 4 in a manner similar to high-temperature superconductors.

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Section: Resultssupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Jin

Zhang

et al. 2015

Nat Commun

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“…[42,43] This is also backed up by other experimental techniques, such as point contact measurements [44] and specific heat measurements, [45] that clearly point to the existence of s-wave superconductivity. The observed features can however be explained by critical current effects.…”

Section: Distinction Between Critical Current Effects and Multiband Omentioning

confidence: 85%

Distinction between critical current effects and intrinsic anomalies in the point-contact Andreev reflection spectra of unconventional superconductors

He¹,

Wei²,

Brisbois³

et al. 2018

Chinese Phys. B

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In this work, we discuss the origin of several anomalies present in the point-contact Andreev reflection spectra of (Li 1−x Fe x )OHFeSe, LiTi 2 O 4 , and La 2−x Ce x CuO 4 . While these features are similar to those stemming from intrinsic superconducting properties, such as Andreev reflection, electron-boson coupling, multigap superconductivity, d-wave and p-wave pairing symmetry, they cannot be accounted for by the modified Blonder-Tinkham-Klapwijk (BTK) model, but require to consider critical current effects arising from the junction geometry. Our results point to the importance of tracking the evolution of the dips and peaks in the differential conductance as a function of the bias voltage, in order to correctly deduce the properties of the superconducting state.

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Mobile Holes in Frustrated Quantum Magnets and Itinerant Fermions on Frustrated Geometries

Poilblanc

Tsunetsugu

2010

Introduction to Frustrated Magnetism

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As discussed in several chapters of this volume, frustration leads to unconventional (insulating) ground states. On the other hand doped holes are known to have profound effects in Mott insulators. Therefore doped frustrated systems offer the prospect of novel phases with some of the most fascinating, challenging and exotic behaviour. In addition, at commensurate electron fillings and in the presence of strong (screened) Coulomb repulsion, geometrical frustration can also manifests itself as an extensive degeneracy of the classical ground-state manifold providing profound similarities with the field of quantum frustrated magnetism.Magnetic frustration in quantum spin systems leads frequently to the formation of spin singlets (dimers). Generically, systems of fluctuating quantum dimers can often order, breaking lattice symmetries to give rise to Valence Bond Crystals (VBCs) [1], but under other circumstances they may remain in a quite unconventional quantum disordered state, the spin liquid, which breaks neither spin nor lattice symmetries. Anderson's original d-wave Resonating Valence Bond (RVB) state [2] is a paradigm for the spin liquid (in fact, for a particular type of gapless spin liquid, while the short-range RVB state composed of only nearest-neighbor dimers is gapped spin liquid). In a number of cases, frustrated spin systems and/or dimer systems can be doped, for example by chemical substitution in a Mott insulator. When both spin and charge degrees of freedom are present, the role of frustration becomes unclear, and to date remains only poorly explored. It is, however, clear that new and exotic phenomena emerge upon doping, including heavy-fermion behavior, spin-charge separation or quasiparticle fractionalization, unconventional superconductivity, stripe formation, bond and/or charge ordering, and many

show abstract

Magnetic field dependence of low-temperature specific heat of the spinel oxide superconductorLiTi2O4

Cited by 46 publications

References 36 publications

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Distinction between critical current effects and intrinsic anomalies in the point-contact Andreev reflection spectra of unconventional superconductors

Mobile Holes in Frustrated Quantum Magnets and Itinerant Fermions on Frustrated Geometries

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