Campbell penetration depth in Fe-based superconductors
نویسنده
چکیده
.......................................................................................... v CHAPTER 1: INTRODUCTION.................................................................. 1 CHAPTER 2: LABUSCH PARAMETER AND CAMPBELL PENETRATION DEPTH.......................................................... 6 Introduction.................................................................................. 6 Labusch parameter........................................................................ 7 Elastic moduli matrix...................................................................... 8 Campbell penetration depth............................................................. 10 Critical current from Campbell penetration depth.................................. 13 Dependency of current in Campbell penetration depth........................... 14 CHAPTER 3: TUNNEL-DIODE RESONATOR.............................................. 17 Introduction.................................................................................. 17 TDR circuit component................................................................... 18 Magnetic penetration depth measurement.......................................... 21 Background noise.......................................................................... 26 CHAPTER 4: CAMPBELL PENETRATION DEPHT IN LiFeAs SUPERCONDUCTOR.................................................................. 30
منابع مشابه
Fe b 19 98 On the T − dependence of the magnetic penetration depth in unconventional superconductors at low temperatures : can it be linear ?
On the T −dependence of the magnetic penetration depth in unconventional superconductors at low temperatures: can it be linear? Abstract We present a thermodynamics argument against a strictly linear temperature dependence of the magnetic penetration depth, which applies to superconduc-tors with arbitrary pairing symmetry at low temperatures.
متن کاملDirect evidence for a pressure-induced nodal superconducting gap in the Ba0.65Rb0.35Fe2As2 superconductor.
The superconducting gap structure in iron-based high-temperature superconductors (Fe-HTSs) is non-universal. In contrast to other unconventional superconductors, in the Fe-HTSs both d-wave and extended s-wave pairing symmetries are close in energy. Probing the proximity between these very different superconducting states and identifying experimental parameters that can tune them is of central i...
متن کاملMicrowave surface-impedance measurements of the magnetic penetration depth in single crystal Ba1-xKxFe2As2 superconductors: evidence for a disorder-dependent superfluid density.
We report high-sensitivity microwave measurements of the in-plane penetration depth lambda_{ab} and quasiparticle scattering rate 1/tau in several single crystals of the hole-doped Fe-based superconductor Ba(1-x)K(x)Fe(2)As(2) (x approximately 0.55). While a power-law temperature dependence of lambda_{ab} with a power approximately 2 is found in crystals with large 1/tau, we observe an exponent...
متن کامل1 8 Se p 20 08 Coexistence of Long - Range Magnetic Order and Superconductivity from Campbell Penetration
Application of a tunnel-diode resonator (TDR) technique for studies of the vortex response in magnetic superconductors is described. Operating at very small ex-citation fields and sufficiently high frequency, TDR was used to probe small-amplitude linear AC response in several types of single crystals where long-range magnetic order coexists with bulk superconductivity. Full local-moment ferroma...
متن کاملThe Kosztin-Leggett Nonlocal Effect on the Magnetic Penetration Depth in Superconductors with Nodes in the Gap
Penetration depth measurements have played a very fundamental role in the study of the gap symmetry of all unconventional superconductors. For instance, from magnetic penetration depth measurements it was first suggested the dwave symmetry for the energy gap in high critical temperature superconductors (HTSC) [1]. It is expected that, for superconducting energy gaps with nodes on the Fermi surf...
متن کامل