Superconductivity of LiTi2O4 and related systems

Heintz, Jean‐Marc; Drillon, Marc; Kuentzler, R.; Dossmann, Y.; Kappler, J.P.; Durmeyer, O.; Gautier, François

doi:10.1007/bf01321907

“…A straight line fit was done and the fit curve is shown in Fig. 8.4 This value is close to that of an isostructural superconducting LiTizO4 hpauli -1 x cm3/(molTi)] [4,135]. From this estimate, we determine the hyperfine coupling constant of 7Li nuclei with conduction elctrons APauli ---1.60kG .…”

Section: Knight Shifts 7li Knight Shiftmentioning

confidence: 59%

LiV<sub>2</sub>O<sub>4</sub>: A heavy fermion transition metal oxide

Kondo

¹

1999

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“…Therefore, the present λ value suggests that LiTi 2 O 4 is a moderate coupling superconductor rather than a weak coupling one. [2][3][4] Nevertheless, the value of λ is much lower than that (~1.8) of the theoretical predictions (indicating strong coupling superconductivity in LiTi 2 O 4 ) which may be due to the spin fluctuation effect. The value of ì* is the same as transition metals, 19 and is in the range of those reported earlier 2-3 confirming the BCS-type d-band superconductivity in LiTi 2 O 4 .…”

Section: Fig 2 Plot Of äC(t)/t Vs T With äC(t) = C(t) -C N (T)mentioning

confidence: 62%

“…[1][2][3][4][5][6][7][8][9][10][11] In the normal spinel-like structure (space group Fd3m) of LiTi 2 O 4 , the Li and Ti atoms are respectively at the positions of tetrahedral (8a) and octahedral (16d) sites.…”

Section: Introductionmentioning

confidence: 99%

“…9 Some theoretical predictions showed that LiTi 2 O 4 was a strong coupling BCS superconductor while the low temperature specific heat and magnetic susceptibility data implied for the conditions for weak coupling d-band superconductivity. [1][2][3][4]10 Furthermore, there has been a very recently revived debate on Anderson's resonating valance bond (RVB)-type ground state as the possible origin of superconductivity in cuprates. 13,14 Since the Ti sub-lattice of the spinel structure allows a high degree of frustration, RVB ground state is probable in the LiTi 2 O 4 spinel.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 Since the Ti sub-lattice of the spinel structure allows a high degree of frustration, RVB ground state is probable in the LiTi 2 O 4 spinel. 10 In fact, the specific heat (C), a thermodynamic bulk property unlike resistivity and magnetization, of LiTi 2 O 4 has been elaborately studied by some groups [2][3][4] in the absence of magnetic field (H). Though some of the derived parameters (listed in Table I) agree quite well with each other, some of them differ significantly and lead to incompatible descriptions for the nature of superconductivity.…”

Section: Introductionmentioning

confidence: 99%

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

Sun

¹

,

Lin

²

,

Mollah

³

et al. 2004

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Magnetic field dependence of low temperature specific heat of spinel oxide superconductor LiTi 2 O 4 has been elaborately investigated. In the normal state, the obtained electronic coefficient of specific heat ã n = 19.15 mJ/mol K 2 , the Debye temperature È D = 657 K and some other parameters are compared with those reported earlier. The superconducting transition at T c~1 1.4 K is very sharp (∆T c ~ 0.3 K) and the estimated äC/ã n T c is ~1.78. In the superconducting state, the best fit of data leads to the electronic specific heat C es /ã n T c = 9.87 exp (-1.58 T c /T) without field and ã(H) ∝ H 0.95 with fields. In addition, H c2 (0) ~ 11.7 T, H c (0)~0.32 T, ξ GL (0) ~ 55 Å , λ GL (0) ~ 1600 Å , and H c1 (0) ~ 26 mT are estimated from Werthamer-Helfand-Hohenberg (WHH) theory or other relevant relations. All results from the present study indicate that LiTi 2 O 4 can be well described by a typical type-II, BCS-like, moderate coupling, and fully gapped superconductor in the dirty limit. It is further suggested that LiTi 2 O 4 is a moderately electron-electron correlated system. 74.25.Bt, 74.25.Ha PACS number(s):

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Superconductors

Rietschel

¹

,

Hoenig²,

Bogner

³

et al. 2000

Ullmann's Encyclopedia of Industrial Chemistry

0

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The article contains sections titled: 1. Introduction 2. Principles 2.1. Electrical Resistance and Thermal Conductivity 2.2. Behavior in Magnetic Fields 2.3. Critical Current 2.4. Energy Gap and Thermodynamic Properties 2.5. Josephson Effects 2.6. Theoretical Descriptions 3. Classes of Superconductors 3.1. Classical Superconductors 3.2. Exotic Superconductors 3.3. High‐Temperature Superconductors 4. Electronic Applications of Superconductivity 4.1. Superconductivity Effects Important for Electronic Applications 4.1.1. Pure Inductances 4.1.2. Small High‐Frequency Losses 4.1.3. Energy‐Gap Effects 4.1.4. Quantum Interference Effects 4.2. Josephson Junctions, Tunnel Junctions, and Weak Links 4.2.1. Junction Types and Their Significance 4.2.2. Josephson Circuits, Digital Circuits, Digital Signal Processing, and Voltage Standards 4.2.3. SQUIDs 4.2.4. SQUIDs and Biomagnetism 4.3. Applications of HT Superconductors 4.3.1. Materials and Techniques for HT‐Superconducting Electronics 4.3.2. Operating Temperatures of HT‐Superconducting Electronics 4.3.3. Passive Components Based on HT Superconductors 4.3.4. HT‐Superconductor Radiation Detectors 4.3.5. Nonlinear HT‐Superconductor Components 4.3.6. HT‐Superconductor SQUIDs 4.4. Refrigerators for Cryoelectronics 5. Application of Superconductivity in Magnet and Power Engineering 5.1. Introduction 5.2. Industrial Superconductors 5.2.1. Metallic Superconductors 5.2.2. Oxide‐Ceramic Superconductors 5.3. Potential Superconductivity for Improvements in Conventional Electrical Devices 5.3.1. Superconducting Magnets for High‐Energy Physics 5.3.2. Magnetic Separation and Purification 5.3.3. Superconducting Levitation for High‐Speed Transportation Systems 5.3.4. Generators and Motors with Superconducting Windings 5.3.5. Superconducting Transformers 5.3.6. Superconducting Power‐Transmission Cables 5.4. Novel Electrical Devices for Which Superconductors Are Indispensable 5.4.1. Magnets for Magnetic Resonance Imaging (MRI) and Spectroscopy 5.4.2. Magnet Systems for Magnetic‐Confinement Fusion Reactors 5.4.3. Magnetohydrodynamic Energy Conversion 5.4.4. Superconducting Magnetic Energy Storage (SMES) 5.4.5. Superconducting Current Limiters 6. Organic Superconductors 6.1. Introduction 6.2. Electronic Structure and Superconductivity 6.3. Other Features of 1‐D Superconductors 6.4. Prospects for Higher T c and Applications

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Superconductivity of LiTi2O4 and related systems

Cited by 48 publications

References 12 publications

LiV<sub>2</sub>O<sub>4</sub>: A heavy fermion transition metal oxide

LiV<sub>2</sub>O<sub>4</sub>: A heavy fermion transition metal oxide

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

Superconductors

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