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We measure magneto-transport and critical currents in Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ Hall bar devices. Above critical current in an applied magnetic field, we observe longitudinal differential voltage along one edge comparable in magnitude…

We have studied the angular dependence of the irreversible magnetization and its time relaxation in YBa$_2$Cu$_3$O$_7$ single crystals with one or two families of columnar defects inclined with respect to the c-axis. At high magnetic…

Superconductivity · Physics 2009-10-31 A. Silhanek , D. Niebieskikwiat , L. Civale , M. A. Avila , O. Billoni , D. Casa

Using the high-sensitive mechanical method of measuring the dissipation processes in superconductors, the 3D-2D phase transition in magnetic field was investigated in the vortex lattice of strongly anisotropic high-temperature…

Superconductivity · Physics 2015-06-24 J. G. Chigvinadze , A. A. Iashvili , T. V. Machaidze

Twin boundaries are generic crystalline defects in noncentrosymmetric crystal structures. We study theoretically twin boundaries in time-reversal symmetric noncentrosymmetric superconductors that admit parity-mixed Cooper pairing. Twin…

Superconductivity · Physics 2013-06-25 Emiko Arahata , Titus Neupert , Manfred Sigrist

Strong evidence for charge-density correlation in the underdoped phase of the cuprate YBa2Cu3Oy was obtained by nuclear magnetic resonance (NMR) and resonant x-ray scatter- ing. The fluctuations were found to be enhanced in strong magnetic…

We study the vortex phase diagram of the single-layer Bi2Sr2CuO6+d (Bi2201) superconductor by means of bulk magnetization measurements on high-quality oxygen-overdoped crystals. In striking contrast with the results found in the…

Superconductivity · Physics 2016-10-05 Alexandre Piriou , Enrico Giannini , Yanina Fasano , Carmine Senatore , Øystein Fischer

The occurence of spin-polarization at ZrO$_{2}$, Al$_{2}$O$_{3}$ and MgO surfaces is proved by means of \textit{ab-initio} calculations within the density functional theory. Large spin moments, as high as 1.56 $\mu_B$, develop at O-ended…

Materials Science · Physics 2009-11-11 S. Gallego , J. I. Beltran , J. Cerda , M. C. Munoz

Time-resolved local induction measurements near to the vortex lattice order-disorder transition in optimally doped Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+\delta}$ single crystals shows that the high-field, disordered phase can be quenched to…

Superconductivity · Physics 2009-10-31 C. J. van der Beek , S. Colson , M. V. Indenbom , M. Konczykowski

The magnetization of the PrFeAsO$_{0.60}$F$_{0.12}$ polycrystalline sample has been measured as functions of temperature and magnetic field $(H)$. The observed total magnetization is the sum of a superconducting irreversible magnetization…

Superconductivity · Physics 2015-05-18 D. Bhoi , P. Mandal , P. Choudhury , S. Dash , A. Banerjee

The magnetic field B_c, in which the electrons become fully spin-polarized, is found to be proportional to the deviation of the electron density from the zero-field metal-insulator transition in a two-dimensional electron system in silicon.…

Strongly Correlated Electrons · Physics 2007-05-23 A. A. Shashkin , S. V. Kravchenko , V. T. Dolgopolov , T. M. Klapwijk

Spin-orbit torques induced by spin Hall and interfacial effects in heavy metal/ferromagnetic bilayers allow for a switching geometry based on in-plane current injection. Using this geometry, we demonstrate deterministic magnetization…

We have investigated the magnetic phase diagram of a fully oxygenated detwinned YBa2Cu3O7 single crystal by means of magneto-caloric and magnetization measurements, and found thermodynamic evidence for a temperature dependent first-order…

Superconductivity · Physics 2011-10-04 M. Reibelt , S. Weyeneth , A. Erb , A. Schilling

We study the distribution of transport current across superconducting Bi$_2$Sr$_2$CaCu$_2$O$_8$ crystals and the vortex flow through the sample edges. We show that the $T_x$ transition is of electrodynamic rather than thermodynamic nature,…

The time-reversal and parity violating superconducting(SC) phase of Bi2Sr2CaCu2O8 induced by a magnetic field (B), reported by Krishana et al[K. Krishana et al, Science 277, 83 (1997)] over the limited field range of 0.6T < B < 5T, is…

Superconductivity · Physics 2011-08-29 Partha Goswami

The critical current density Jc in type-II conventional and high-Tc superconducting bulk materials is investigated based on the quantum theory for the vortex dynamics. It is shown that for a constant magnetic field, the critical current…

Superconductivity · Physics 2012-04-17 Ming Ju Chou , Wei Yeu Chen

A low concentration of columnar defects is reported to transform a first-order vortex lattice melting line in BSCCO crystals into alternating segments of first-order and second-order transitions separated by two critical points. As the…

The quasi one-dimensional compound BaCu2Si2O7 demonstrates numerous spin-reorientation transitions both for a magnetic field applied along the easy axis of magnetization, and for a magnetic field applied perpendicular to it. The magnetic…

Strongly Correlated Electrons · Physics 2011-04-13 V. N. Glazkov , G. Dhalenne , A. Revcolevschi , A. Zheludev

Using a novel technique of measuring direct rf power dissipation, the temperature and magnetic field dependence of rf absorption in superconducting single crystals of Bi_2Sr_2CaCu_2O_8 is studied. An unexpected, larger than normal state,…

Superconductivity · Physics 2007-05-23 S. P. Chockalingam , S. Sarangi , S. V. Bhat , K. Oka , Y. Nishihara

The magnetization of porous $Bi_{1.8}Pb_{0.3}Sr_2Ca_2Cu_3O_x$ have been investigated. The experimental magnetization hysteretic loops of $M(H)$ were described in the frames of Val'kov -- Khrustalev model developed for type II granular…

Superconductivity · Physics 2007-05-23 D. M. Gokhfeld , D. A. Balaev , S. I Popkov , K. A. Shaykhutdinov , M. I. Petrov

Transport current distribution in clean 2$H$-NbSe$_{2}$ crystals is studied by measuring the self-induced magnetic field across the sample. Below $T_c$ most of the current flows at the edges of the crystals due to strong surface barriers,…

Superconductivity · Physics 2009-10-31 Y. Paltiel , D. T. Fuchs , E. Zeldov , Y. N. Myasoedov , H. Shtrikman , E. Y. Andrei