Дисертації з теми "D-wave superconductor"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-24 дисертацій для дослідження на тему "D-wave superconductor".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Monroe, Jonathan Robert. "Collective modes of a d-wave superconductor." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612282.
Повний текст джерелаZhao, Hongwei. "Local tunneling characteristics near a grain boundary of a d-wave superconductor as probed by a normal-metal or a low-Tc-superconductor STM tip." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2373.
Повний текст джерелаTanaka, Y., Y. Tanuma, and A. A. Golubov. "Odd-frequency pairing in normal-metal/superconductor junctions." American Physical Society, 2007. http://hdl.handle.net/2237/11289.
Повний текст джерелаFreamat, Mario Vadim. "NORMAL AND SPIN POLARIZED TRANSPORT IN HIGH-TEMPERATURE SUPERCONDUCTOR TUNNELING JUNCTIONS." UKnowledge, 2004. http://uknowledge.uky.edu/gradschool_diss/426.
Повний текст джерелаZare, Aida [Verfasser], and Nils [Akademischer Betreuer] Schopohl. "Impurity Scattering and Magnetic Field Influence on a Nodal Surface of a d-Wave Superconductor / Aida Zare ; Betreuer: Nils Schopohl." Tübingen : Universitätsbibliothek Tübingen, 2012. http://d-nb.info/1162699612/34.
Повний текст джерелаFeder, David L. "Inhomogeneous d-wave superconductors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30085.pdf.
Повний текст джерелаFeder, David. "Inhomogeneous d-wave superconductors /." *McMaster only, 1997.
Знайти повний текст джерелаPairor, Puangratana. "In-plane tunneling spectroscopy of d-wave superconductors." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63754.pdf.
Повний текст джерелаDurst, Adam Craig 1974. "Low temperature quasiparticle transport in d-wave superconductors." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29305.
Повний текст джерелаIncludes bibliographical references (p. 120-124).
Experiments have now established that the order parameter (gap) in the high-Tc cuprate superconductors exhibits d-wave symmetry, vanishing at four nodal points on the Fermi surface. Near each of these four gap nodes, quasiparticles are easily excited and behave more like massless relativistic particles than electrons in a metal. In this thesis, we study the transport properties of these nodal quasiparticles, providing theoretical interpretations for the results of low temperature thermal and (microwave) electrical transport experiments in the cuprates. We begin by considering the very low temperature regime in which transport is dominated by quasiparticles induced by the very presence of impurities. This is known as the universal limit because prior calculations indicate that the transport coefficients obtain universal (scattering-independent) values. We improve upon prior results by including the contribution of vertex corrections and find that while the electrical conductivity obtains a scattering-dependent correction, the thermal and spin conductivity maintain their universal values.
(cont.) We then focus on the microwave electrical conductivity and consider the slightly higher temperature regime where quasiparticles are excited thermally. Since measurements in detwinned samples yield results that are inconsistent with simple models of impurity scattering, we hypothesize that line defects, remnant from the process of removing twin boundaries, may provide an additional scattering mechanism. We calculate the self-energy and microwave conductivity due to line defect scattering and obtain results that agree well with experiment. Finally, we turn on a magnetic field and consider thermal transport in the mixed (vortex) state. In the weak-field regime, the thermal conductivity tensor can be expressed in terms of the cross section for quasiparticle scattering from a single vortex. We calculate this cross section and thereby obtain both the longitudinal thermal conductivity and the thermal Hall conductivity in surprisingly good qualitative agreement with the measured data. The transparent nature of our calculation allows us to obtain a physical understanding of the features seen in experiments.
by Adam Craig Durst.
Ph.D.
Branch, Dwayne G. "Optical properties of strongly coupled d-wave superconductors with an anisotropic momentum dependent interaction /." *McMaster only, 1997.
Знайти повний текст джерелаMichal, Vincent P. "Zeeman effects in heavy electron superconductors." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY043/document.
Повний текст джерелаUnderstanding the properties of newly discovered strongly correlated electron compounds is a considerable challenge for both fundamental matters and long-term industrial impact. Experimental activity on heavy electron metals and superconductors has lead to highlighting effects that depart from current knowledge. The thesis is aimed at modelling effects that have been observed in response to magnetic field in the heavy electron superconductor CeCoIn$_5$. This consists of two parts. In the first time we deal with the vortex lattice state anomalous local magnetic field space variations as highlighted by small angle neutron scattering and muon spin rotation experiment. On the basis of the Ginzburg-Landau theory with account of spin effect, we analyse the local field inhomogeneity in the vortex lattice and derive expressions for the neutron scattering form factors and muon spin rotation static linewidth. The anomalous experimental data are shown to be result of spin driven supercurrents which circulate around the vortex cores and lead to an increase with external field in the internal field inhomogeneity on a distance of the order of the superconducting coherence length from the vortex axis. The importance of the effect is controlled by a single quantity (the Maki parameter). The second part is on nearly commensurate spin density wave transition in a quasi two-dimensional superconductor. It is motivated by observation of the confinement of spin density wave ordering inside the superconducting state of CeCoIn$_5$ in magnetic field. In the frame of the spin-fermion formulation we propose a mechanism for the ground state transition consisting in the field-induced slowing down of a collective spin density fluctuation mode (spin-exciton) to static ordering. This represents a scenario by which the transition to spin ordering is intrinsically related to superconductivity
Duncan, R. D. (Richard D. ). "A Quantum phase trasition in d-wave superconductors and symmetry features of quasi-one-dimensional superconductors." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/29337.
Повний текст джерелаPeronaci, Francesco. "Transient dynamics of unconventional superconductors: d-wave symmetry and strong correlations." Doctoral thesis, SISSA, 2016. http://hdl.handle.net/20.500.11767/4916.
Повний текст джерелаChanda, Geoffrey. "Terahertz and infrared spectroscopy of novel superconductors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-157061.
Повний текст джерелаDell'Anna, Luca. "Disordered d-wave superconductors: the role of nesting and interactions in transport properties." Doctoral thesis, SISSA, 2002. http://hdl.handle.net/20.500.11767/3938.
Повний текст джерелаBranch, Dwayne G. "Optical properties of strongly coupled d-wave superconductors with an anisotropic momentum dependent interaction." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0004/NQ42726.pdf.
Повний текст джерелаAmmar, Kirmani A. "NOVEL PHYSICAL PHENOMENA IN CORRELATED SUPERFLUIDS AND SUPERCONDUCTORS IN- AND OUT-OF-EQUILIBRIUM." Kent State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=kent1586785964148996.
Повний текст джерелаWatanabe, T., H. Yokoyama, Y. Tanaka, and J. Inoue. "Predominant magnetic states in the Hubbard model on anisotropic triangular lattices." American Physical Society, 2008. http://hdl.handle.net/2237/11256.
Повний текст джерелаChen, YU-You, and 陳昱佑. "Strong impurities freezing nematicity in underdoped d-wave high –temperarute superconductor." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/24142885862107776761.
Повний текст джерелаChang, Chun-Fu, and 張春富. "Impurity effect on d-wave superconductor La1.78Sr0.22Cu1-xNixO4: A magnetic field dependent specific heat study." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/35487214698575201538.
Повний текст джерела國立中山大學
物理學系
87
Very recently quasiparticles in d-wave vortex state have attracted much attention. To explore this issue, magnetic field dependence of the low-temperature specific heat (LTSH) of La-1.78Sr0.22Cu1-xNixO4 is desirable to provide information about the quasiparticle electronic states of cuprates in vortex state with the presence of impurities. We found that the magnetic dependence of linear-T coefficient g of Ni-doped samples varies as Hln(1/H) rather than H1/2, consistent with the most recent theoretical approach including impurity scattering of dirty d-wave scenario. Furthermore, our results are compared with the recently proposed scaling theory.
Mallik, Aabhaas Vineet. "The role of quantum fluctuations in the t-J model: Implications for cuprate superconductors." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5436.
Повний текст джерелаLiu, Yu-Sheng, and 劉于聖. "Holographic d-wave Superconductors." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15481195708787310563.
Повний текст джерела國立臺灣大學
物理研究所
99
We study the d-wave (spin two) superconductors through its dual gravitational description using AdS/CFT duality with finite temperature. To give the anisotropic nature of spectral function, we introduce the Majorana coupling in the neutral blackhole metric without back reaction. We find that the spectral function is indeed anisotropically gapped. At low temperature or strong Majorana coupling, the spectral function shrinks to four nodal points. At high temperature or weak Majorana coupling, the spectral function is partially gapped and generates fermi arc. Also we consider the effect of the dirac mass and there is a phase difference between the condensate fields, that is the d+id scenario. The dirac mass term will cause the spectral function to shrink or to expand with respect to the origin in the momentum space. In the d+id scenario, we find the s-wave and d-wave mixing in the spectral function.
Dai, Mei-Cheng, and 戴美澂. "Magnetic Properties in d-wave Superconductors." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/30393368277224120713.
Повний текст джерела國立交通大學
電子物理系
87
The Ginzburg-Landau theory has successfully predicted many interesting properties of $d$-wave superconductors near $T_c$. Most of the theories proposed so far assumed the order parameter with purely $d_{x^2-y^2}$-wave symmetry or mixed $s$+$d$ symmetry. Within the context of the relevant phenomenological and microscopical Ginzburg-Landau theory, this thesis is concerned with studies of the magnetic properties for a $d$-wave superconductor. Underlain by the Ginzburg-Landau theory of a $d$-wave superconductor with mass anisotropy $\lambda = m_x/m_y$, we have derived the non-zero, subsidiary order parameter induced by an external current. The amplitude of induced $s$-component depends on the amplitude and direction of the current. The extreme values appear in some specific conditions. Unlike the isotropic case, we find that the current density is not parallel to the wave vector any more except $M_a = 1$. The single vortex structure is derived in the presence of applied magnetic field. According to our results, the winding number of the $s$-wave does not change regardless of the vector potential. The generic London equation for a $d_{x^2-y^2}$-wave superconductor with mass anisotropy is expressed. By neglecting higher order terms, this work analyzes the magnetic-field distribution with and without a vortex. The interaction force between two parallel vortices is derived as well. Our results further reveal the presence of a torque between vortices irrespective of $s$- or $d$-wave order parameter, which is expected to vanish for isotropic cases. This implies that a torque between vortices due to mass anisotropy can change the lattice structure. A $d_{x^2-y^2}$ superconductor is modeled as the superconducting layers in the $a$-$b$ plane, whose coupling in the $c$-direction is approximated by the effective mass, within the Ginzburg-Landau theory. In this work, this model is applied to the system where the coherence length along the $c$-direction is greater than the layer spacing. Based on our model, we calculate the upper critical field in a magnetic field lying in $a$-$c$ plane and tilted by an angle from the $c$-axis. According to our results, the curvature of $H_{c2}(T)$ is upward, and the slope $-dH_{c2}(T)/dT$ depends on the angle between the c-axis and the external field. It is worthwhile to note that the ratio of the $c$-direction parameter related to the effective mass to the $a$-$b$ plane parameter connected with the effective mass can make enormous influence $H_{c2}$. As this ratio decreases, $H_{c2}$ becomes increasing. We also find that there is no admixture of $s$-wave component in the critical regime and believe that the upward curvature of the $H_{c2}(T)$ is illuminated as the characteristic property of a $d$-wave superconductor. In the context of the time-dependent Ginzburg-Landau theory for a $d_{x^2-y^2}$-wave superconductor, we investigate the energy theorem that demonstrates that the rate of increase of the total free energy plus the rate of dissipation equals the inflow of energy current. In addition, we derive an equation of motion for a single vortex $(h \ll H_{c2})$ in the presence of an applied transport current. Our results indicate that the imaginary parts of the relaxation times for $s$- and $d$-wave order parameters can change a sign of the Hall effect. We also find that the change of the parameters in the Ginzburg-Landau free energy functional, due to the nonmagnetic impurities, can affect the anomalous Hall effect. The tangent of Hall angle is investigated and found that the negative part of the tangent of Hall angle is essentially due to the imaginary parts of the relaxation time.
Chiang, Hsin0Chun, and 江欣峻. "Metal-insulator Transition, Weak Ferromagnetism and d-wave Superconductivity in High-Tc Electron Superconductors." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/65088096122497301180.
Повний текст джерела國立清華大學
物理學系
88
Metal-insulator transition in the Gd-doped (R1-yGdy)1.85Ce0.15CuO4-d systems occurred around y ~ 0.65 for R = Nd and y ~ 0.1 for R = Eu with a simultaneous structural transition from the tetragonal T¢-phase (space group I4/mmm) to an orthorhombic O¢-phase (Acam, ao £ bo ~O2 at). The structural change is due to the lattice mismatch between (R,Gd,Ce)2O2 layer and CuO2 layer which results with an oxygen distortion in the perfect square CuO2 plane. The phase diagram indicates that the superconductivity can only occur in the metallic T¢-phase cuprates where the metallic state is controlled by a delicate balance between oxygen reduction and structural stability. The oxygen distortion lowers the crystal symmetry from T¢-phase to O¢-phase (space group: Acam) at room temperature. The Cu2+ weak ferromagnetic weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order observed in the insulating region is the direct result of non-180° a(Cu-O-Cu) canting angle of the O¢-phase. In order to confirm the pairing state of the high temperature electron superconductor Pr1.85Ce0.15CuO4-d was chosen for further study. The temperature dependence of the in-plane magnetic penetration depth lab(T) of magnetically aligned powders of crystalline Pr1.85Ce0.15CuO4-d is reported. The temperature dependence of lab(T)- lab(0) shows a power law component but not all exponential decay indicative there are nodes on the Fermi surface. The result implies that the order parameter of high Tc electron superconductors should not be totally s-wave but a little d-wave symmetry.