Characteristic features of the exotic superconductors

Brandow, B.H.

doi:10.1016/s0370-1573(97)00071-9

Cited by 59 publications

(25 citation statements)

References 627 publications

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“…some dichalcogenides (TiS 2 [5] and NbSe 2 [7]) and exotic superconductors [8]. The coefficient of the T 2 term in ␤-MoTe 2 of (1.54 × 10 −8 cm K −2 ) is approximately one order smaller than of TlCu 2−x Se 2 [6] and in the same order as that of TiS 2 [5](2.0 × 10 −8 cm K −2 ).…”

Section: Discussionmentioning

confidence: 95%

Quadratic temperature dependence up to 50 K of the resistivity of metallic MoTe2

Zandt¹,

Dwelk²,

Janowitz³

et al. 2007

Journal of Alloys and Compounds

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Section: Discussionmentioning

confidence: 95%

Quadratic temperature dependence up to 50 K of the resistivity of metallic MoTe2

Zandt¹,

Dwelk²,

Janowitz³

et al. 2007

Journal of Alloys and Compounds

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“…This study concluded that LiTi 2 O 4 belongs to the family of so-called "exotic" superconductors. [62][63][64][65] These superconductors are characterized by large ratios of T c /t f ‫ס‬ 1 ⁄10 to 1 ⁄100 (T f is the Fermi temperature). This distinguishes them from ordinary BCS superconductors, for which T c /T f Յ 1 ⁄1000.…”

Section: (2) Mechanism Of Superconductivitymentioning

confidence: 99%

Superconductivity in the Spinel Compound LiTi2O4

Moshopoulou

1999

Journal of the American Ceramic Society

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LiTi 2 O 4 has been the subject of considerable experimental and theoretical interest since the discovery of its superconductivity by Johnston et al. 1 This unique, low-T c (11.2 K) spinel oxide superconductor exhibits unusual characteristics, and interestingly, it presents properties that depend on various defects of the spinel structure. This article reviews experimental and theoretical studies of LiTi 2 O 4 and discusses the basic, unresolved issues regarding the physics of this system. Special emphasis is given to methods for preparing the compound and to the structure-properties relationship.

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“…It should be noted that such an unusually wide interval of validity for a pure T 2 dependence is quite characteristic for strongly correlated materials [59][60][61][62][63], although its origin is not yet fully understood [59]. In this paper, we take advantage of this to graphically define the coefficients R 0 and R 2 .…”

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confidence: 99%

Polaron framework to account for transport properties in metallic epitaxial manganite films

et al. 2014

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We propose a model for the consistent interpretation of the transport behavior of manganese perovskites in both the metallic and insulating regimes. The concept of polarons as charge carriers in the metallic ferromagnetic phase of manganites also solves the conflict between transport models, which usually neglects polaron effects in the metallic phase, and, on the other hand, optical conductivity, angle-resolved spectroscopy, and neutron scattering measurements, which identify polarons in the metallic phase of manganites down to 6 K. Transport characterizations of epitaxial La 0.7 Sr 0.3 MnO 3 thin films in the thickness range of 5-40 nm and temperature interval of 25-410 K have been accurately collected. We show that taking into account polaron effects allows us to achieve an excellent fit of the transport curves in the whole temperature range. The current carriers density collapse picture accurately accounts for the properties variation across the metal-insulator transitions. The electron-phonon coupling parameter γ estimations are in a good agreement with theoretical predictions. The results promote a clear and straightforward quantitative description of the manganite films involved in charge transport device applications and promises to describe other oxide systems involving a metal-insulator transition. Ferromagnetic manganites are a prototypical example of the so-called half-metallic materials, i.e., materials with 100% spin polarization at 0 K. Although their possible application in commercial spintronics is prevented by a relatively low Curie temperature (T C 370 K), manganites represent an ideal laboratory tool to test spin transport in various materials and to search for pioneering device paradigms [1,2]. Thus, the use of manganites have significantly contributed to the field of organic spintronics, where almost half of the reported devices have La 0.7 Sr 0.3 MnO 3 (LSMO) as an injector [3]. In this context, revealing in a most exhaustive and comprehensive way, the transport properties of these materials looks both captivating and thought provoking.The transport properties of manganites are strongly linked to their ferromagnetism and are generally described in the framework of the so-called double-exchange mechanism: below T C the exchange interaction between Mn cations through oxygen anions favors ferromagnetism and electron delocalization along the Mn-O-Mn bonds, while above T C , thermal disorder disrupts this delocalization leading to a metal-insulator transition (MIT) [4]. Nevertheless, this basic picture appears to be conceptually insufficient to describe the physics of manganites, in general, and LSMO, in particular [5]: the strong role of polaron effects in manganites has been pointed out [6], and good experimental evidence has been provided by a variety of methods [6][7][8][9][10][11][12][13]. Moreover, manganites were proposed as an example of a polaron Fermi liquid [7].Although the presence of polarons in the metallic phase of LSMO (down to 6 K) has been demonstrated by optical * patrizio.gr...

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Characteristic features of the exotic superconductors

Cited by 59 publications

References 627 publications

Quadratic temperature dependence up to 50 K of the resistivity of metallic MoTe2

Quadratic temperature dependence up to 50 K of the resistivity of metallic MoTe2

Superconductivity in the Spinel Compound LiTi2O4

Polaron framework to account for transport properties in metallic epitaxial manganite films

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