Zobrazeno 1 - 10
of 191
pro vyhledávání: '"Beek, C. J."'
Autor:
Dolz, M. I., Bolecek, N. R. Cejas, Puig, J., Pastoriza, H., Nieva, G., Guimpel, J., van der Beek, C. J., Konczykowski, M., Fasano, Y.
Publikováno v:
Phys. Rev. B 100, 064508 (2019)
We study the penetration field $H_{\rm P}$ for vortex nanocrystals nucleated in micron-sized samples with edges aligned along the nodal and anti-nodal directions of the d-wave superconducting parameter of Bi$_2$Sr$_2$CaCu$_2$O$_{8 - \delta}$. Here we
Externí odkaz:
http://arxiv.org/abs/1906.08706
Direct visualization of local interaction forces in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ vortex matter
Autor:
Sánchez, J. Aragón, Maldonado, R. Cortés, Dolz, M. I., Bolecek, N. R. Cejas, van der Beek, C. J., Konczykowski, M., Fasano, Y.
We study the local vortex-vortex interaction force $\textbf{f}_i$ of the structure frozen during a field-cooling process in an electron-irradiated Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ sample. We compute this magnitude from snapshots of the vortex struc
Externí odkaz:
http://arxiv.org/abs/1905.05324
Autor:
Rumi, G., Albornoz, L. J., Pedrazzini, P., Dolz, M. I., Pastoriza, H., van der Beek, C. J., Konczykowski, M., Fasano, Y.
We study the entropy jump associated with the first-order vortex melting transition (FOT) in Bi2Sr2CaCu2O8+{\delta} crystals by means of Hall probe magnetometry. The samples present a diluted distribution of columnar defects (CD) introduced by irradi
Externí odkaz:
http://arxiv.org/abs/1903.11150
Autor:
Bolecek, N. R. Cejas, Dolz, M. I., Pastoriza, H., Konczykowski, M., van der Beek, C. J., Kolton, A. B., Fasano, Y.
Publikováno v:
Phys. Rev. B 96, 024507 (2017)
We directly image individual vortex positions in nanocrystals in order to unveil the structural property that contributes to the depletion of the entropy-jump entailed at the first-order transition. On reducing the nanocrystal size the density of top
Externí odkaz:
http://arxiv.org/abs/1704.01040
Autor:
Zhang, Z., Piovera, C., Papalazarou, E., Marsi, M., d'Astuto, M., van der Beek, C. J., Taleb-Ibrahimi, A., Perfetti, L.
Publikováno v:
Phys. Rev. B 96, 064510 (2017)
We report time and angle resolved spectroscopic measurements in optimally doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$. The spectral function is monitored as a function of temperature, photoexcitation density and delay time from the pump pulse. According
Externí odkaz:
http://arxiv.org/abs/1703.07860
Publikováno v:
New J. Phys. 18 (2016) 073024
Compensation of intrinsic charges is widely used to reduce the bulk conductivity of 3D topological insulators (TIs). Here we use low temperature electron irradiation-induced defects paired with in-situ electrical transport measurements to fine-tune t
Externí odkaz:
http://arxiv.org/abs/1609.07785
Publikováno v:
J. Phys.: Condens. Matter 28 (2016) 425701 (6pp)
Small-angle neutron scattering on high quality single crystalline Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ reveals the transition from a low--field vortex solid phase with orientational order to a vortex polycrystal at high magnetic field. The vortex order-
Externí odkaz:
http://arxiv.org/abs/1608.06490
Autor:
Bolecek, N. R. Cejas, Dolz, M. I., Kolton, A., Pastoriza, H., van der Beek, C. J., Konczykowski, M., Menghini, M., de la Cruz, F., Nieva, G., Fasano, Y.
Publikováno v:
Journal Low Temperature Physics 179, 35 (2015)
We study geometrical confinement effects in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8 +\delta}$ mesoscopic vortex-matter with edge-to-surface ratio of $7-12$%. Samples have in-plane square and circular edges, 30\,$\mu$m widths, and $\sim 2\,\mu$m thickness. Di
Externí odkaz:
http://arxiv.org/abs/1409.7305
Autor:
Perfetti, L., Sciolla, B., Biroli, G., van der Beek, C. J., Piovera, C., Wolf, M., Kampfrath, T.
Publikováno v:
Phys. Rev. Lett. 114, 067003 (2015)
Despite extensive work on high-temperature superconductors, the critical behavior of an incipient condensate has so far been studied exclusively under equilibrium conditions. Here, we excite Bi2Sr2CaCu2O8+d with a femtosecond laser pulse and monitor
Externí odkaz:
http://arxiv.org/abs/1407.7689
Publikováno v:
Phys. Rev. B 88, 205207 (2013)
Electron irradiation is investigated as a way to dope the topological insulator Bi2Te3. For this, p-type Bi2Te3 single crystals have been irradiated with 2.5 MeV electrons at room temperature and electrical measurements have been performed in-situ as
Externí odkaz:
http://arxiv.org/abs/1312.0242