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Detecting the latent heat of Bragg glass melting in a classic type-II superconductor

Detecting the latent heat of Bragg glass melting in a classic type-II superconductor. X. S. Ling, Brown University, DMR-0406626.

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Detecting the latent heat of Bragg glass melting in a classic type-II superconductor

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  1. Detecting the latent heat of Bragg glass melting in a classic type-II superconductor X. S. Ling, Brown University,DMR-0406626 Type-II superconductors are being used in MRI machines, superconducting magnets in accelerators, etc. Yet, one of the most fundamental questions concerning these materials as to whether they are truly superconducting has not been fully resolved. For example, the PI’s recent neutron scattering studies showed a Bragg glass transition in a classic type-II superconductor Nb, which would signify a true superconducting phase in magnetic fields. However, a true thermodyanmic phase transition should also be accompanied by a latent heat signature in specific heat measurements. Such measurements are performed on the Nb sample studied by neutron scattering. Finally, the long sought-after signature of Bragg glass melting has bee observed. The left panel shows the variation of sample temperature (while the base temperature held fixed) as a function of magnetic field. The two negative peaks indicate latent heat of phase transitions near Hc1 and Hc2. The right panel is a phase diagram of the same sample.

  2. Detecting the latent heat of Bragg glass melting in a classic type-II superconductor X. S. Ling, Brown University,DMR-0406626 Education: Two Ph.D. students Nikos Daniilidis and Ivo Dimitrov are currently carrying their Ph.D. thesis studies under the support of the DMR program. Students are being trained in superconductivity, neutron scattering, low-temperature physics, ultrasensitive electrical measurements. Society Impact: With the eventual depletion of world’s fossil energy sources, sooner or later humanity will have to confront the fundamental issues of energy carrying and storage. High-temperature superconductors will one day become a major carrier of electricity. The study of basic physics of vortex matter in these materials will lay a solid foundation for the emerging superconducting technology. Journal Publications: 1. X.S. Ling, S.R. Park, B.A. McClain, S.M. Choi, D.C. Dender, and J.W. Lynn, Physical Review Letters 86, 712 (2001). 2. S.R. Park, S.M. Choi, D.C. Dender, J.W. Lynn, and X.S. Ling, Physical Review Letters 91, 167003 (2003). 3. N. Daniilidis, I. Dimitrov, C. Elbaum, V. Mitrovic, and X.S. Ling, manuscript in preparation.

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