Fluctuations and criticality in quantum paraelectrics.
نویسندگان
چکیده
The temperature dependence of the static dielectric susceptibility of a system with strongly coupled fluctuating dipoles is calculated within a self-consistent mean fluctuation field approximation. Results are qualitatively in good agreement with a quantum paraelectric SrTiO(3) in the low temperature regime. We identify this system as a gapped quantum paraelectric and suggest a possible experimental realization of a quantum critical paraelectric through the application of hydrostatic pressure or doping by impurity.
منابع مشابه
Quantum Critical Origin of the Superconducting Dome in SrTiO_{3}.
We expand the well-known notion that quantum criticality can induce superconductivity by proposing a concrete mechanism for superconductivity due to quantum ferroelectric fluctuations. To this end, we investigate the origin of superconductivity in doped SrTiO_{3} using a combination of density functional and strong coupling theories within the framework of quantum criticality. Our density funct...
متن کاملJu n 20 09 Weak First Order Phase Transitions in Quantum Ferroelectrics
We discuss the possibility of weak first order transition in the domain of pressure induced phase transitions in quantum paraelectrics as a consequence of the coupling between strain and order parameter fluctuations. We start with a semimicroscopic Hamiltonian, where paraelectric(optical mode) fluctuations are controlled by hydrostatic pressure via strain coupling, which above certain strength ...
متن کاملQuantum critical paraelectrics and the Casimir effect in time
We study the quantum paraelectric-ferroelectric transition near a quantum critical point, emphasizing the role of temperature as a “finite-size effect” in time. The influence of temperature near quantum criticality may thus be likened to a temporal Casimir effect. The resulting finite-size scaling approach yields 1 T2 behavior of the paraelectric susceptibility and the scaling form ,T = 1 2 F T...
متن کاملLocal criticality close to a quantum Lifshitz point
Near quantum Lifshitz points the stiffness of the lifetime of the spin fluctuations is very small. This gives rise to a regime where the critical fluctuations are local in space but extended along the time directions. The Fermi liquid properties in this local quantum regime is governed by a single energy scale, the coherence temperature. These results are relevant for heavy fermions and frustra...
متن کاملFractal Fluctuations and Statistical Normal Distribution
Dynamical systems in nature exhibit selfsimilar fractal fluctuations and the corresponding power spectra follow inverse power law form signifying long-range space-time correlations identified as self-organized criticality. The physics of selforganized criticality is not yet identified. The Gaussian probability distribution used widely for analysis and description of large data sets underestimat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of physics. Condensed matter : an Institute of Physics journal
دوره 21 9 شماره
صفحات -
تاریخ انتشار 2009