Variational theory of flux-line liquids

We formulate a variational (Hartree like) description of flux line liquids which improves on the theory we developed in an earlier paper [A.M. Ettouhami, Phys. Rev. B 65, 134504 (2002)]. We derive, in particular, how the massive term confining the fluctuations of flux lines varies with temperature and show that this term vanishes at high enough temperatures where the vortices behave as freely fluctuating elastic lines.Comment: 10 pages, 1 postscript figur

Interstitials, Vacancies and Dislocations in Flux-Line Lattices: A Theory of Vortex Crystals, Supersolids and Liquids

We study a three dimensional Abrikosov vortex lattice in the presence of an equilibrium concentration of vacancy, interstitial and dislocation loops. Vacancies and interstitials renormalize the long-wavelength bulk and tilt elastic moduli. Dislocation loops lead to the vanishing of the long-wavelength shear modulus. The coupling to vacancies and interstitials - which are always present in the liquid state - allows dislocations to relax stresses by climbing out of their glide plane. Surprisingly, this mechanism does not yield any further independent renormalization of the tilt and compressional moduli at long wavelengths. The long wavelength properties of the resulting state are formally identical to that of the ``flux-line hexatic'' that is a candidate ``normal'' hexatically ordered vortex liquid state.Comment: 21 RevTeX pgs, 7 eps figures uuencoded; corrected typos, published versio

Universality of Frequency and Field Scaling of the Conductivity Measured by Ac-Susceptibility of a Ybco-Film

Utilizing a novel and exact inversion scheme, we determine the complex linear conductivity $\sigma (\omega )$ from the linear magnetic ac-susceptibility which has been measured from 3\,mHz to 50\,MHz in fields between 0.4\,T and 4\,T applied parallel to the c-axis of a 250\,nm thin disk. The frequency derivative of the phase $\sigma ''/\sigma '$ and the dynamical scaling of $\sigma (\omega)$ above and below $T_g(B)$ provide clear evidence for a continuous phase transition at $T_g$ to a generic superconducting state. Based on the vortex-glass scaling model, the resulting critical exponents $\nu$ and $z$ are close to those frequently obtained on films by other means and associated with an 'isotropic' vortex glass. The field effect on $\sigma(\omega)$ can be related to the increase of the glass coherence length, $\xi_g\sim B$.Comment: 8 pages (5 figures upon request), revtex 3.0, APK.94.01.0

Implementasi Laporan Penyelenggaraan Pemerintahan Daerah (LPPD) Pada Sekretariat Daerah Minahasa Selatan

IMPLEMENTASI LAPORAN PENYELENGGARAAN PEMERINTAHAN DAERAH (LPPD)  PADA SEKRETARIAT DAERAH MINAHASA SELATAN Oleh:Henry Nelson Momuat[1], Jetty E.H Mokat[2], Fitri H. Mamonto[3]  ABSTRAKPenelitian ini bertujuan untuk mendeskripsikan dan menganalisis  implementasi LPPD di Sekretariat Daerah Minahasa Selatan, serta hambatan yang ditemui dalam proses implementasinya. Penelitian ini  menggunakan pendekatan kualitatif dengan teknik pengumpulan data yaitu melalui wawancara, observasi dan dokumentasi. Penelitian ini menyimpulkan bahwa proses penyusunan LPPD di Sekeretariat Daerah Kabupaten Minahasa Selatan belum sesuai dengan target yang ditetapkan, sehingga hasil yang dicapai tidak maksimal. Hal dipengaruhi oleh beberapa hal yaitu:  kurang tersedianya data yang sesuai format, kurangnya komitmen dan motivasi pegawai,  kompetensi SDM,  kurangnya koordinasi dan komunikasi, serta penilaian atas hasil kerja. Terdapat beberapa faktor yang menghambat selama proses penyusunan LPPD di Sekretariat Daerah Minahasa Selatan, yaitu: komunikasi/informasi yang kurang efektif, sumber daya pegawai maupun peralatan yang terbatas, kurangnya koordinasi antara penyusun LPPD di tiap Bagian dan belum tersedianya SOP penyusunan LPPD pada tiap Bagian serta belum dilakukannya pemberian reward dan punishment. Kata Kunci : Implementasi, LPPD, Minahasa Selatan  Implementation of Local Government Implementation Reports (LPPD) at the South Minahasa Regional Secretariat By: Henry Nelson Momuat, Jetty Erna Hilda Mokat, Fitri H. Mamonto ABSTRACTThis study aims to describe and analyze the implementation of the LPPD in the Secretariat of the South Minahasa Region, as well as the obstacles encountered in the implementation process. This study uses a qualitative approach to data collection techniques, namely through interviews, observation and documentation. This study concludes that the process of preparing LPPD in the Regional Secretariat of South Minahasa Regency is not in accordance with the targets set, so that the results achieved are not optimal. This is influenced by several things, namely: the lack of data in accordance with the format, the lack of commitment and motivation of employees, HR competencies, lack of coordination and communication, as well as an assessment of work results. There are several factors that hampered during the process of drafting LPPD in the South Minahasa Regional Secretariat, namely: ineffective communication / information, limited employee resources and equipment, lack of coordination between LPPD compilers in each Section and the unavailability of SOPs for the preparation of LPPD in each Section and the reward and punishment has not been done yet. Keywords: Implementation, LPPD, South Minahasa[1] Mahasiswa Program Studi Magister Ilmu Administrasi Negara Pascasarjana Universitas Negeri Manado[2] Komisi Pembimbing[3] Komisi Pembimbin

Estimation of Buttiker-Landauer traversal time based on the visibility of transmission current

We present a proposal for the estimation of B\"uttiker-Landauer traversal time based on the visibility of transmission current. We analyze the tunneling phenomena with a time-dependent potential and obtain the time-dependent transmission current. We found that the visibility is directly connected to the traversal time. Furthermore, this result is valid not only for rectangular potential barrier but also for general form of potential to which the WKB approximation is applicable . We compared these results with the numerical values obtained from the simulation of Nelson's quantum mechanics. Both of them fit together and it shows our method is very effective to measure experimentally the traversal time.Comment: 12 pages, REVTeX, including 7 eps figure

Optimal Hypercontractivity for Fermi Fields and Related Non-Commutative Integration

Optimal hypercontractivity bounds for the fermion oscillator semigroup are obtained. These are the fermion analogs of the optimal hypercontractivity bounds for the boson oscillator semigroup obtained by Nelson. In the process, several results of independent interest in the theory of non-commutative integration are established. {}.Comment: 18 p., princeton/ecel/7-12-9

Hydrodynamics of liquids of arbitrarily curved flux-lines and vortex loops

We derive a hydrodynamic model for a liquid of arbitrarily curved flux-lines and vortex loops using the mapping of the vortex liquid onto a liquid of relativistic charged quantum bosons in 2+1 dimensions recently suggested by Tesanovic and by Sudbo and collaborators. The loops in the flux-line system correspond to particle-antiparticle fluctuations in the bosons. We explicitly incorporate the externally applied magnetic field which in the boson model corresponds to a chemical potential associated with the conserved charge density of the bosons. We propose this model as a convenient and physically appealing starting point for studying the properties of the vortex liquid

Tunneling Time Distribution by means of Nelson's Quantum Mechanics and Wave-Particle Duality

We calculate a tunneling time distribution by means of Nelson's quantum mechanics and investigate its statistical properties. The relationship between the average and deviation of tunneling time suggests the exsistence of ``wave-particle duality'' in the tunneling phenomena.Comment: 14 pages including 11 figures, the text has been revise

Vortex-line liquid phases: Longitudinal superconductivity in the lattice London model

We study the vortex-line lattice and liquid phases of a clean type-II superconductor by means of Monte Carlo simulations of the lattice London model. Motivated by a recent controversy regarding the presence, within this model, of a vortex-liquid regime with longitudinal superconducting coherence over long length scales, we directly compare two different ways to calculate the longitudinal coherence. For an isotropic superconductor, we interpret our results in terms of a temperature regime within the liquid phase in which longitudinal superconducting coherence extends over length scales larger than the system thickness studied. We note that this regime disappears in the moderately anisotropic case due to a proliferation, close to the flux-line lattice melting temperature, of vortex loops between the layers.Comment: 8 pages, Revtex, with eps figures. To appear in Phys. Rev.

The H\"older Inequality for KMS States

We prove a H\"older inequality for KMS States, which generalises a well-known trace-inequality. Our results are based on the theory of non-commutative $L_p$-spaces.Comment: 10 page