Physics of Superconductivity and Magnetism

Variational and fixed-node Green's-function Monte Carlo calculations have been performed to find the ground-state properties of the two-dimensional electron gas in the density range 1\ensuremath{\le}${r}_{s}$\ensuremath{\le}100. Our calculations predict a Wigner crystallization at the density ${r}_{s}$\ensuremath{\sim…

Compact solid-state sources of terahertz (THz) radiation are being sought for sensing, imaging, and spectroscopy applications across the physical and biological sciences. We demonstrate that coherent continuous-wave THz radiation of sizable power can be extracted from intrinsic Josephson junctions in the layered high-…

• LÜTFİ ÖZYÜZER

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• ÖZHAN ÖZATAY

First-principles calculations of the electronic band structure and lattice dynamics for the new superconductor MgB (2) are carried out and found to be in excellent agreement with our inelastic neutron scattering measurements. The numerical results reveal that the E(2g) in-plane boron phonons near the zone center are v…

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• LÜTFİ ÖZYÜZER

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• MEHMET CENGİZ ONBAŞLI

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• MEHMET CENGİZ ONBAŞLI

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• MEHMET KERİM RAMAZANOĞLU

The vertical and horizontal forces and associated stiffnesses on a permanent magnet (PM) above a high-temperature superconductor (HTS) were measured during vertical and horizontal traverses in zero-field cooling (ZFC) and in field cooling (FC). In ZFC, the vertical stiffness was greater in the first descent than in th…

• AHMET CANSIZ

New tunneling data are reported in ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ which show quasiparticle excitation gaps, \ensuremath{\Delta}, reaching values as high as 60 meV for underdoped crystals with ${T}_{c}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}70\math…

• LÜTFİ ÖZYÜZER

Tunneling spectroscopy measurements are reported on single crystals of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ using vacuum tunneling and point-contact methods. A reproducible dip feature in the tunneling conductance is found near $|\mathrm{eV}|\phantom{\rule{0ex}{0e…

• LÜTFİ ÖZYÜZER

The competition between nonmagnetic spin-Peierls (SP) and magnetic N\'eel ground states has been investigated in CuGe${\mathrm{O}}_{3}$ doped with Zn, Ni, Mn, and Si. The analysis of specific heat, ${C}_{p}$, data in CuGe${\mathrm{O}}_{3}$, measured as a function of magnetic field, supports a SP transition at ${T}_{\m…