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Crossover from paramagnetic compressed flux regime to diamagnetic pinned vortex lattice in a single crystal of cubic Ca_{3}Rh_{4}Sn_{13}
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Kulkarni, P. D., Banerjee, Satyajit S., Tomy, C. V., Balakrishnan, G., Paul, Don McK., Ramakrishnan, S. (Srinivasan) and Grover, A. (Arun) (2011) Crossover from paramagnetic compressed flux regime to diamagnetic pinned vortex lattice in a single crystal of cubic Ca_{3}Rh_{4}Sn_{13}. Physical Review B (Condensed Matter and Materials Physics), Vol.84 (No.1). Article 014501. doi:10.1103/PhysRevB.84.014501 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.84.014501
Abstract
We report the observation of positive magnetization on field cooling (PMFC) in low applied magnetic fields (H < 100 Oe) in a single crystal of Ca(3)Rh(4)Sn(13) near its superconducting transition temperature (T(c) approximate to 8.35 K). For 30 Oe < H < 100 Oe, the PMFC response crosses over to a diamagnetic response as the temperature is lowered below 8 K. For 100 Oe < H < 300 Oe, the diamagnetic response undergoes an unexpected reversal in its field dependence above a characteristic temperature (designated as T*(VL) = 7.9 K), where the field-cooled cool-down magnetization curves intersect. The in-phase and out-of-phase ac susceptibility data confirm the change in the superconducting state across T*(VL). We ascribe the PMFC response to a compression of magnetic flux caused by the nucleation of superconductivity at the surface of the sample. In very low fields (H < 20 Oe), the PMFC response has an interesting oscillatory behavior, which persists up to about 7 K. The oscillatory nature underlines the interplay between competing responses contributing to the magnetization signal in the PMFC regime. We believe that the (i) counterintuitive field dependence of the diamagnetic response for H > 100 Oe and above T*(VL) (lasting up to Tc), (ii) the oscillatory character in the PMFC response at low fields, and (iii) the PMFC peaks near 8.2 K in 30 Oe <= H <= 100 Oe provide support in favor of a theoretical scenario based on the Ginzburg-Landau equations. The scenario predicts the possibility of complex magnetic fluctuations associated with transformation between different metastable giant vortex states prior to transforming into the conventional vortex state as the sample is cooled below T*(VL).
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Paramagnetism, Diamagnetism, Crystals -- Magnetic properties, Magnetic flux compression, High temperature superconductors | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 14 July 2011 | ||||
Dates: |
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Volume: | Vol.84 | ||||
Number: | No.1 | ||||
Page Range: | Article 014501 | ||||
DOI: | 10.1103/PhysRevB.84.014501 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), Spain. Ministerio de Ciencia e Innovación (MCINN), India. Dept. of Science and Technology (DST) |
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