Dissertations / Theses on the topic 'Electric field induced phase transition'
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Koussir, Houda. "Multiscale study of the electric field induced transition in the Mott phase of GaMo4S8 crystals and TaSe2 monolayers." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILN004.
In the realm of condensed matter physics, Mott insulators are essential for exploring complex electronic phenomena, with significant implications for high-temperature superconductivity and quantum spin liquids. This thesis investigates two types of such materials, distinguished by their dimensionality : GaMo4S8 crystals and monolayer 1T-TaSe2.After presenting their properties in the first chapter, the second chapter addresses the local-scale characterization techniques used to characterize both materials, namely scanning tunneling microscopy and spectroscopy for structural and electronic studies, and multi-tip scanning tunneling microscopy for transport measurements. The latter technique was particularly employed to analyze transport in GaMo4S8. The study then delved into the material response to external electric fields, examining the threshold electric field in relation to the electrode geometry and exploring the temporal evolution of switching times in connection with inter-electrode distances. The achievement of volatile transitions opens prospects for applications such as the operation of a microneuron at room temperature.To enhance the control over phase transition properties of Mott insulators, it is beneficial to consider two-dimensional systems where the current flow is restricted within the crystal plane. The final chapter focuses on the 1T phase of TaSe2, epitaxially grown on gallium phosphide (GaP) semiconductor substrates. Low-temperature scanning tunneling microscopy studies reveal that 1T-TaSe2 monolayers exhibit not only the characteristic charge density modulation (Star of David) of the charge density wave phase but also a unique Moiré pattern due to the monolayer interaction with the GaP substrate. Scanning tunneling spectroscopy has identified a bandgap, hallmark of the Mott insulating state. This state is further substantiated by temperature-dependent transport measurements that show the persistence of the insulating phase up to 400 kelvins. Notably, spectroscopic measurements with varying tip-to-surface distances have unveiled insulator to metal transitions at low temperatures. The observation of such transitions suggests that this large-scale heterostructure could be a material of choice for neuromorphic applications
Peräntie, J. (Jani). "Electric-field-induced dielectric and caloric effects in relaxor ferroelectrics." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526204406.
Tiivistelmä Tässä työssä tutkittiin dielektristen ominaisuuksien ja lämpötilan käyttäytymistä teknologisesti merkittävissä (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) ja (1−x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-PT) ferrosähköisissä relaksorimateriaaleissa sähkökentän vaikutuksen alaisena. Tutkimuksen erityishuomion kohteena olivat sähköisesti indusoidut faasimuutokset sekä sähkökalorinen ilmiö, jotka liittyvät läheisesti nykyisiin sekä tulevaisuuden sovellutuksiin. Monikiteisiä PMN-PT keraamikoostumuksia (x=0−0,3) valmistettiin sekä reaktiivisella sintrauksella että kolumbiittimenetelmällä. Lisäksi tutkimuksessa käytettiin kaupallisia PMN-PT erilliskiteitä, joiden koostumus on lähellä morfotrooppista faasirajaa. Työssä käytetty PZN-PT erilliskide kasvatettiin jäähdyttämällä korkean lämpötilan liuoksesta. Materiaaleja tutkittiin pääosin lämpötilan ja dielektristen ominaisuuksien mittauksilla. Kun PMN-PT keraamisysteemiin kohdistettiin alhainen sähkökenttä, sähkökalorisen ilmiön selkeä maksimiarvo havaittiin lähellä materiaalin termistä depolarisaatiolämpötilaa. Suuremmilla sähkökentän arvoilla sähkökalorinen ilmiö voimistui ja sen lämpötila-alue laajeni korkeampiin lämpötiloihin polaaristen nanoalueiden kytkeytymisen vuoksi. Sähkökalorisen lämpötilamuutoksen maksimi vaihteli välillä 0,77−1,55 °C sähkökentän arvolla 50 kV/cm. Lisäksi lämpötilamittaukset depoolatulle PMN-0,13PT koostumukselle osoittivat, että sähkökalorisen ilmiön ohella materiaalissa esiintyy makroskooppisen polarisaation muodostumiseen liittyvä palautumaton lämpöenergia depolarisaatiolämpötilaa pienemmissä lämpötiloissa hystereesihäviön ja mahdollisen faasimuutoksen vaikutuksesta. PMN-PT erilliskiteiden dielektrisyys- ja lämpötilavasteessa havaittiin selkeitä muutoksia sähkökentän vaikuttaessa <001> ja <011> kidesuuntiin. Nämä muutokset ovat selitettävissä PMN-PT:n polarisaation kompleksisten rotaatiosuuntien ja erityyppisten sähkökenttä-lämpötila -faasidiagrammien stabiilisuusalueiden avulla. PMN-PT kiteiden mittauksissa havaittiin myös ensimmäinen suora osoitus väliaikaisesti käänteisestä sähkökalorisesta ilmiöstä sähkökentän kasvaessa. Lisäksi mitatut PZN-PT erilliskiteen sähkökaloriset ominaisuudet transitiolämpötilan läheisyydessä pystyttiin pääpiirteittäin mallintamaan käyttämällä yksinkertaista hilamallia ja keskimääräisen kentän approksimaatiota. Mallinnuksen mukaan sähkökalorinen ilmiö aiheutuu pääasiassa sähköisesti indusoidusta dipolientropian alenemisesta
Cheng, Long. "Relaxor ferroelectrics for neuromorphic computing." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST073.
To overcome challenges posed by traditional von Neumann architectures, neuromorphic computing draws inspiration from brain science to create energy-efficient hardware adaptable to complex tasks. Memristors, though novel, face issues like Joule heat hindering ultra-low-power neural computing.To address this, we propose a memcapacitor mechanism - the electric-field-induced phase transition. Memcapacitors, expressing signals as voltage, offer lower power consumption than memristors (current-based). Our study on relaxor ferroelectric materials (PMN-28PT, PZN-4.5PT) and conventional ferroelectric BTO (001) demonstrates the universal nature ofelectric-field-induced phase transitions. Customized pulses enable the replication of long-term potentiation (LTP), depression (LTD), and spike-timing-dependent plasticity (STDP).Additionally, relaxor ferroelectrics exhibit a dendrite effect absent in conventional counterparts. Implementing PZN-4.5PT dendrites in neural networks improves accuracy (83.44%), surpassing memristor networks with linear dendrites (81.84%) and significantly outperforming networks without dendrites (80.1%).Ultimately, we successfully implement a relaxor memcapacitor using a PMN thin film.This metal/ferroelectric/metal/insulator structure achieves 3-bit capacitance states through field-induced phase transitions. 8 robust memcapacitive states exhibit consistent maintenance over 100 seconds and exceptional endurance exceeding 5×10^5cycles. Tailored pulses effectively emulate LTP and LTD, and enable the exploration of temperature-dependent synaptic functionalities
Johnson, Louise. "Electric field-induced transitions and interlayer interactions in intermediate smectic liquid crystal phases." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/electric-fieldinduced-transitions-and-interlayer-interactions-in-intermediate-smectic-liquid-crystal-phases(64a81e3e-d148-48b4-8e94-4abd44117655).html.
Royles, Adam John. "Electric-field-induced phase transformations in lead-free piezoelectric ceramics." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578687.
Pilla, S. "Electric-field induced glass phase in molecular solids at low temperatures." [Gainesville, Fla.] : University of Florida, 1999. http://etd.fcla.edu/etd/uf/1999/amp7406/pilla.pdf.
Title from first page of PDF file. Document formatted into pages; contains xi, 95 p.; also contains graphics (some colored). Vita. Includes bibliographical references (p. 90-94).
An, Ran. "Study of the field-induced phase transition for the antiferromagnetic chain /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MATH%202006%20AN.
Gustainis, Peter. "Field induced phase transition in one dimensional Heisenberg antiferromagnet model studied using density matrix renormalization group." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61214.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
Leist, Jeannis-Nicos, Jakob Sidoruk, Holger Gibhardt, Klaudia Hradil, Martin Meven, and Götz Eckold. "Domain redistribution and ferroelectric phase transition in SrTiO 3 under the influence of an electric field and mechanical stress." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-187976.
Leist, Jeannis-Nicos, Jakob Sidoruk, Holger Gibhardt, Klaudia Hradil, Martin Meven, and Götz Eckold. "Domain redistribution and ferroelectric phase transition in SrTiO 3 under the influence of an electric field and mechanical stress." Diffusion fundamentals 12 (2010) 69, 2010. https://ul.qucosa.de/id/qucosa%3A13899.
Rambo, Matthew P. "Study of ZrSiO4 phase transition using perturbed angular correlation spectroscopy." Connect to this document online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1109871239.
Title from first page of PDF document. Document formatted into pages; contains [1], vii, 55 p. : ill. Includes bibliographical references (p. 53-55).
Rambo, Matthew P. "Study of ZrSiO4 Phase Transition Using Perturbed Angular Correlation Spectroscopy." Miami University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=miami1109871239.
Jose, Davis. "Dynamics of the B-A transition of DNA double helices." Doctoral thesis, [S.l.] : [s.n.], 2005. http://webdoc.sub.gwdg.de/diss/2005/jose/jose.pdf.
Khanal, Kiran. "Liquid-Crystalline Ordering in Semiflexible Polymer Melts and Blends: A Monte Carlo Simulation Study." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1373901748.
Barbut, Jean-Marc. "Texturation d'YBa2Cu3O(7-[delta]) par fusion de zone sous champ magnétique : détermination par mesure de courant critique de son diagramme de phase dans le plan [H,[THETA]] à 77 K : mise en évidence par mesures résistives de l'existence en champ nul d'une transition du 1er ordre dans l'état supraconducteur." Grenoble 1, 1994. http://www.theses.fr/1994GRE10049.
Morosan, Emilia. "Field-induced magnetic phase transitions and correlated electronic states in the hexagonal RAgGe and RPtIn series /." 2005.
HSU-WEN-TING and 許文廷. "Phase Transition and Electric-field Poling Effect in Pb(Mg1/3Nb2/3)1-xTixO3." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/56986355845184987551.
輔仁大學
物理學系
93
This work was measured electric permittivity and observed polarizing microscope after applied different electric field on (111)-cut single crystal Pb(Mg1/3Nb2/3)1-xTixO3 , for x= 28.6, 34.4, and 35.8. In these samples, an electric field applied along the [111] direction. As electric field applied, more polarization of sample domains was rotated into monoclinic phase, and this phase plays an important role in phase transition while temperature increases. Electric field enhanced some phase transition or induced phase appear with monoclinic phase increase. By measured dielectric permittivity frequency scanning, we also found dielectric resonance after applied electric field.
SHEN, YU-REN, and 沈毓仁. "Optically induced phase grating in an electric-field biased planar aligned liquid-crystal films." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/27953695765786987720.
Chiou, Shih-Wei, and 邱仕偉. "Field-induced shape memory effect and pseudoelastic phenomenon associated with phase transition behavior in lead zirconate titanate stannate system." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/04386025736528868763.
Lee, Chi-Fen, and 李季芬. "The Study of Electric Field and Surface Electro-clinic Effect on the Alignment of the Ferroelectric Liquid Crystal Cell with N*-SmC* Phase Transition." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/438gbm.
國立臺北科技大學
光電工程系研究所
95
In the ferroelectric liquid crystal(FLC) material with N*-SmC* phase sequence, two types of domain with opposite polarization direction randomly formed in the SmC* phase. The director of the molecules in each domain deviate a fixed angle in opposite side from the rubbing direction due to the surface electroclinic effect. Therefore, horizontal chevron defects form and then, the alignment in this kind of material is not uniform. In this paper, we investigated the relationship between the alignment and the deviation angle in the ferroelectric liquid crystal cell by applying an electric field (direct current or alternating current) during N*-SmC* phase transition. The deviation angle is denoted as the angle between the molecular axis and the rubbing direction. In the case of the direct current(DC) electric field applied to the FLC cell during N*-SmC* phase transition, when the amplitude of the electric field is sufficiently larger then a threshold voltage, the molecules can be induced the same polarity and make the same deviation angle from the rubbing direction. As a result, the FLC cell can form a mono-domain alignment. By increasing the amplitude, the angle between molecular axis and rubbing direction become larger. When the polarity of the DC electric field changes the direction of the deviation angle and the polarity of the molecules will be changed. According to the result of the condition of DC electric field, while applying alternating current(AC) electric field with a fixed frequency to the FLC cell during N*-SmC* phase transition, two types of domain with opposite deviation angle and polarization sign form in the SmC* phase. Because two types of domain coexist in the cell, the layer normal of two domains tilt in opposite direction with respect to the rubbing direction and form horizontal chevron defects. However, when the deviation angle is equal to half of the apparent angle of the FLC material, the layer normals of the two domains are parallel to the rubbing direction and a uniform dark state can be observed under crossed polarizers.
Tabei, Seyed Mohiaddeen Ali. "Interplay of Disorder and Transverse-Field Induced Quantum Fluctuations in the LiHo_xY_{1-x}F_4 Ising Magnetic Material." Thesis, 2008. http://hdl.handle.net/10012/3888.
Prévost, Bobby. "Étude des propriétés magnétiques des aimants frustrés Ba(Dy,Ho)2O4 et SrHo2O4 par diffusion de neutrons." Thèse, 2018. http://hdl.handle.net/1866/21151.