High temperature superconductivity in the LiTiO ternary system

Johnston, D. C.; Prakash, Hari; Zachariasen, W. H.; Viswanathan, R.

doi:10.1016/0025-5408(73)90183-9

Cited by 396 publications

(123 citation statements)

References 7 publications

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“…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. 2e).…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

“…It was discovered in early 1970's by Johnston et al 2 , and it has the superconducting transition temperature T c of 11 K (ref. 1).…”

mentioning

confidence: 99%

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Jin

Zhang

et al. 2015

Nat Commun

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“…An orthorhombic LaSrCoO 3 H 0.7 , obtained from the tetragonal RP type single-layered perovskite LaSrCoO 4 , is the first transition metal oxyhydride with significant amounts of hydride ions (Figures 5a and 5b). 57 The replaced hydride anions are located in the equatorial site, in contrast to oxyhalides Sr 2 FeO 3 X (X = Cl and Br), 62 in which the halide anions occupy the apical positions.…”

Section: ç Transition Metal Oxyhydridesmentioning

confidence: 99%

Hydride Reductions of Transition Metal Oxides

Yamamoto

Kageyama

2013

Chemistry Letters

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Low-temperature reactions are a powerful approach to generate new transition metal oxides that are inaccessible by conventional high-temperature reactions. In this review, we describe the recent progress of the topochemical reduction method using metal hydrides for transition metal oxides, in particular, focusing on structural modifications (relations), chemical and physical properties, and the factors that direct selective and rational preparations. The hydride reduction has been so far extensively applied to 3d transition metal perovskite oxides, yielding highly reduced products with unusual coordination environment (e.g., FeO 4 square-planar coordination), and extremely low-valent metal centers (e.g., Mn(I) and Co(I)). Non-perovskite oxides like pyrochlore and hexagonal perovskite can be also reduced. Moreover, this method allows access to oxyhydride materials (LaSrCoO 3 H 0.7 and BaTiO 3¹x H x ) that are promising for use as hydride ion conductors. Morphology-controlled oxides (thin film-and nano-oxides) are useful targets for hydride reduction, opening new possibilities for extending functions. Ç IntroductionTransition metal (TM) oxides like spinel and perovskite oxides represent a variety of exotic and useful chemical and physical properties that include magnetoresistance, multiferroics, superconductivity, photocatalysis, thermoelectricity, and so on.17 These properties are closely related to the valence, spinstate, coordination of transition metal centers, and how they are connected to form an extended network. In order to achieve improved or new properties, cation chemistry has been often executed. For example, tuning the MnOMn bridging angle in LaMnO 3 by rare-earth substitution induces a large multiferroic responce.8 However, conventional solid-state synthesis at high temperature produces only thermodynamically stable products and permits limited access to structural modifications.Low-temperature reactions have attracted recent attention owing to its kinetics-driven nature, providing, in principle, rational and predictable design of structures and compositions as a metastable product. Ion-exchange reaction is such a process, which is found in minerals (e.g., clay), and is also of technological and industrial importance since nearly a century ago. Intercalation (deintercalation) reactions involve reactive species to be inserted into (extracted from) a host compound. The important feature in these soft chemical reactions is that the structural framework remains unchanged when comparing the starting and final compounds during the reaction. Therefore, if a suitable reaction condition (precursor material, reactant, temperature, etc.) is chosen, one may obtain a desired structure and composition with novel functionalities.TM perovskite ABO 3 oxides (Figure 1a) have high tolerance to oxygen deficiency (ABO 3¹¤ ), as found in SrFeO 3¹¤ and LaNiO 3¹¤ . 11,12 Increase of the oxygen content in the perovskiterelated cuprate YBa 2 Cu 3 O 7¹¤ (0¯¤¯1) gives rise to drastic change in the ground states, from ...

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“…[12][13][14][15] In addition, there are some notable transition-metal-oxide superconductors, such as tungsten bronzes with T C values up to 6 K. 16,17 Within the 3d-transition-metal series, Ti + -based compounds are predicted to be promising candidates for high-T C superconductors as a result of their special filling (3d 1 and S = 1/2), 18 but superconducting titanates have been limited to materials like electrondoped SrTiO 3 (T C ≈0.41 K), 19 non-stoichiometric titanium monoxide TiO x (T C ≤ 2.3 K) 20,21 and ternary oxide Li-Ti-O (T C ≈14 K). [22][23][24] Recently, interest in superconducting titanate thin films has resurged, and superconductivity in TiO, 25 ) valence states, and there has been no report of superconductivity in a "pure" Ti 3+ (3d 1 ) system. Little progress has been made over the past several decades in the search for binary-oxide superconductors, which might possess attractive characteristics such as structural simplicity, high tenability and environmental stability.…”

Section: Introductionmentioning

confidence: 99%

Observation of superconductivity in structure-selected Ti2O3 thin films

Weng

Zhang

et al. 2018

NPG Asia Mater

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The search for new superconductors capable of carrying loss-free current has been a research theme in condensed matter physics for the past decade. Among superconducting compounds, titanates have not been pursued as much as Cu 2+ (3d 9 ) (cuprate) and Fe 2+ (3d 6 ) (pnictide) compounds. Particularly, Ti 3+ -based compounds or electron systems with a special 3d 1 filling are thought to be promising candidates as high-T C superconductors, but there has been no report on such pure Ti 3+ -based superconducting titanates. With the advent of thin-film growth technology, stabilizing new structural phases in single-crystalline thin films is a promising strategy to realize physical properties that are absent in the bulk counterparts. Herein, we report the discovery of unexpected superconductivity in orthorhombicstructured thin films of Ti 2 O 3 , a 3d 1 electron system, which is in strong contrast to the conventional semiconducting corundum-structured Ti 2 O 3 . This is the first report of superconductivity in a titanate with a pure 3d 1 electron configuration. Superconductivity at 8 K was observed in the orthorhombic Ti 2 O 3 films. Leveraging the strong structureproperty correlation in transition-metal oxides, our discovery introduces a previously unrecognized route for inducing emergent superconductivity in a newly stabilized polymorph phase in epitaxial thin films.

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High temperature superconductivity in the LiTiO ternary system

Cited by 396 publications

References 7 publications

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Anomalous magnetoresistance in the spinel superconductor LiTi2O4

Hydride Reductions of Transition Metal Oxides

Observation of superconductivity in structure-selected Ti2O3 thin films

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