Evolution of paramagnetic quasiparticle excitations emerged in the high-field superconducting phase of CeCoIn5.

Evolution of Paramagnetic Quasiparticle Excitations Emerged in the High - Field Superconducting

Condition for gapless color-antitriplet excitations in Nambu–Jona-Lasinio models

At high baryon density and low temperature, matter is believed to be in a color superconducting state, which is characterized by condensates of quark Cooper pairs [1–4]. A superconducting phase typically has an energy gap in the density of states, which corresponds to the lowest excitation energy of a quasiparticle pair. However, if the difference between the Fermi momenta of the paired quarks ...

Studies of the low-energy quasiparticle excitations in high-temperature superconducting cuprates with scanning tunneling spectroscopy and magnetization measurements

This thesis details the investigation of the unconventional low-energy quasiparticle excitations in both hole-and electron-type cuprate superconductors through experimental studies and theoretical modeling. The experimental studies include spatially resolved scanning tunneling spectroscopy (STS) experiments and bulk magnetization measurements, and the theoretical modeling involves developing a ...

Doping dependence of low-energy quasiparticle excitations in superconducting Bi2212

: The doping-dependent evolution of the d-wave superconducting state is studied from the perspective of the angle-resolved photoemission spectra of a high-Tc cuprate, Bi2Sr2CaCu2 O8+δ (Bi2212). The anisotropic evolution of the energy gap for Bogoliubov quasiparticles is parametrized by critical temperature and superfluid density. The renormalization of nodal quasiparticles is evaluated in terms...

Avoided antiferromagnetic order and quantum critical point in CeCoIn5.

We measured the specific heat and resistivity of heavy fermion CeCoIn5 between the superconducting critical field H(c2)=5 T and 9 T, with the field in the [001] direction, and at temperatures down to 50 mK. At 5 T the data show a non-Fermi liquid (NFL) behavior down to the lowest temperatures. At the field above 8 T the data exhibit a crossover from the Fermi liquid to a non-Fermi liquid behavi...