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Institution

Solid State Physics Laboratory

FacilityDelhi, India
About: Solid State Physics Laboratory is a facility organization based out in Delhi, India. It is known for research contribution in the topics: Quantum dot & Dielectric. The organization has 1754 authors who have published 2597 publications receiving 50601 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors present a study of magneto-thermal instabilities in polycrystalline MgB2 superconductor, by magnetic hysteresis loop measurements and by investigations of magnetic flux dynamics with a miniature Hall probe.
Abstract: We present a study of magneto-thermal instabilities in polycrystalline MgB2 superconductor, by magnetic hysteresis loop measurements and by investigations of magnetic flux dynamics with a miniature Hall probe. Temperature and magnetic field ranges where the flux jumps may be observed have been determined. On the basis of measurements of the magnetic flux dynamics, an average magnetic diffusivity describing the process of the flux jump is estimated. This parameter is compared with the thermal and magnetic diffusivities calculated on the basis of available data for thermal conductivity, heat capacity and resistivity. It is shown that the estimated value of the field of the first flux jump is influenced significantly by the field dependence of specific heat. In order to explain the observed phenomenon, the temperature reached by the sample during the flux jump at different magnetic fields is calculated.

39 citations

Journal ArticleDOI
TL;DR: In this paper, the reversible mixed-state properties of superconducting materials are summarized and discussed in terms of new results and evaluations, which take the two band character of the material explicitly into account.
Abstract: The reversible mixed-state properties of superconducting ${\mathrm{MgB}}_{2}$ are summarized and discussed in terms of new results and evaluations, which take the two band character of the material explicitly into account. The magnetic field dependence of the reversible magnetization is analyzed within Ginzburg Landau theory which, however, fits only either at high or at low fields. The resulting parameters (e.g., characteristic fields, lengths, and anisotropy) are quite different in these two regimes. We find large anisotropies of about 4.6 at high fields and low temperatures, but values close to 1 at low fields. Finally, we present neutron irradiation experiments, where new defects, leading to strong irreversibility but also to a modification of the reversible properties, are induced.

39 citations

Journal ArticleDOI
TL;DR: In this article, the authors reported a breakthrough in the spin coherence times of hole ensembles, confined in the so-called natural QDs, in narrow GaAs/AlGaAs quantum wells at temperatures below 500 mK.
Abstract: For the realization of scalable solid-state quantum-bit systems, spins in semiconductor quantum dots (QDs) are promising candidates. A key requirement for quantum logic operations is a sufficiently long coherence time of the spin system. Recently, hole spins in III–V-based QDs were discussed as alternatives to electron spins, since the hole spin, in contrast to the electron spin, is not affected by contact hyperfine interaction with the nuclear spins. Here, we report a breakthrough in the spin coherence times of hole ensembles, confined in the so-called natural QDs, in narrow GaAs/AlGaAs quantum wells at temperatures below 500 mK. Consistently, time-resolved Faraday rotation and resonant spin amplification techniques deliver hole-spin coherence times, which approach in the low magnetic field limit values above 70 ns. The optical initialization of the hole spin polarization, as well as the interconnected electron and hole spin dynamics in our samples, are well reproduced using a rate equation model.

39 citations

Journal ArticleDOI
TL;DR: In this article, the electrical properties of polycrystalline Li-Sb ferrites, when successively substituted with Co2+ ions, have been investigated and the decrease in resistivity has been attributed to the cation distribution and the presence of cobalt ions in the two valence states at the octahedral site.

39 citations

Journal ArticleDOI
TL;DR: In this paper, an enhancement in the value of magnetoelectric coupling coefficient was observed when lead zirconate titanate (PZT) ferroelectric material near morphotropic phase boundary (MPB) is mixed with small amount of high resistive nickel substituted cobalt ferrite (CNFO) phase in comparison to pure cobalt-ferrite (CFO).

39 citations


Authors

Showing all 1757 results

NameH-indexPapersCitations
Alain Dufresne11135845904
Yang Ren7988026341
Klaus Ensslin7063821385
Werner Wegscheider6993321984
Takashi Takahashi6542414234
Liu Hao Tjeng6432213752
Nicholas E. Geacintov6345315636
Manfred Sigrist6146818362
Thomas Ihn6147514159
Takafumi Sato5926311032
Christoph Stampfer5931514422
Christian Colliex5828914618
Takashi Mizokawa5740011697
Eberhard Bodenschatz5737413208
Bertram Batlogg551909459
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202210
202174
202087
201992
201878