Advanced Condensed Matter Physics

In this work, the phase diagram of ${\mathrm{Li}}_{x}{\mathrm{CoO}}_{2}$ is calculated from first principles for x ranging from 0 to 1. Our calculations indicate that there is a tendency for Li ordering at $x=\frac{1}{2}$ in agreement with experiment [J. N. Reimers and J. R. Dahn, J. Electrochem. Soc. 139, 2091 (1992)…

• MEHMET KADRİ AYDINOL

No abstract yet.

• LÜTFİ ÖZYÜZER

In recent years, two important advances have opened new doors for the characterization and determination of magnetic structures. Firstly, researchers have produced computer-readable listings of the magnetic or Shubnikov space groups. Secondly, they have extended and applied the superspace formalism, which is presently…

• EMRE TAŞCI

No abstract yet.

• MEHMET KERİM RAMAZANOĞLU

No abstract yet.

• MUSTAFA AKYOL

Introducing magnetic order in a topological insulator (TI) breaks time-reversal symmetry of the surface states and can thus yield a variety of interesting physics and promises for novel spintronic devices. To date, however, magnetic effects in TIs have been demonstrated only at temperatures far below those needed for…

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…

Using spin-wave and random-phase-approximation expressions for the dynamic spin susceptibility of a two-dimensional ${\mathrm{CuO}}_{2}$ lattice, we have calculated the NMR Knight shifts K and spin-relaxation rates ${T}_{1}^{\mathrm{\ensuremath{-}}1}$ at various nuclear sites for the insulating and metallic phases. Ou…

• NEJAT BULUT

A free web page under the name MAGNDATA , which provides detailed quantitative information on more than 400 published magnetic structures, has been developed and is available at the Bilbao Crystallographic Server (http://www.cryst.ehu.es). It includes both commensurate and incommensurate structures. This first article…

• EMRE TAŞCI

We have extended a weak-coupling theory of antiferromagnetic fluctuations to the superconducting state and analyzed NMR data for ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$. Within this framework we find that while an s-wave gap structure with 2\ensuremath{\Delta}(0)/${\mathit{kT}}_{\mathit{c}}$=4 can fi…

• NEJAT BULUT