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We report on a hierarchy of temperatures Tc < Tgap < Tmet in superconducting Rb1-xFe2-ySe2 observed by THz spectroscopy. Above Tmet = 90 K the material reveals semiconducting characteristics. Below Tmet a coherent metallic THz response…

Superconductivity · Physics 2014-03-05 Zhe Wang , M. Schmidt , J. Fischer , V. Tsurkan , M. Greger , D. Vollhardt , A. Loidl , J. Deisenhofer

A thermal gradient as the driving force for spin currents plays a key role in spin caloritronics. In this field the spin Seebeck effect (SSE) is of major interest and was investigated in terms of in-plane thermal gradients inducing…

The parameter regime in which a Brinkmann-Rice (BR) transition appears near half-filling is investigated for a model of of one kind of electrons traversing a plane randomly tiled with CuO_4 molecules, simulating the copper-oxide planes of…

Strongly Correlated Electrons · Physics 2007-05-23 D. K. Sunko

Temperature-dependent inter-plane resistivity, $\rho_c(T)$, was measured systematically as a function of transition metal substitution in the iron-arsenide superconductors Ba(Fe$_{1-x}$T$_x$)$_2$As$_2$, $T$= Ni, Pd, Rh. The data are…

Superconductivity · Physics 2011-12-06 M. A. Tanatar , N. Ni , A. Thaler , S. L. Bud'ko , P. C. Canfield , R. Prozorov

The physics of the strongly interacting Hubbard chain (with $t/U \ll 1$) at finite temperatures undergoes a crossover to a spin incoherent regime when the temperature is very small relative to the Fermi energy, but larger than the…

Strongly Correlated Electrons · Physics 2014-11-05 Mohammad Soltanieh-ha , Adrian E. Feiguin

We present the results of $^{75}$As nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), and resistivity measurements in KFe$_2$As$_2$ under pressure ($p$). The temperature dependence of the NMR shift, nuclear spin-lattice…

Superconductivity · Physics 2018-05-10 P. Wiecki , V. Taufour , D. Y. Chung , M. G. Kanatzidis , S. L. Bud'ko , P. C. Canfield , Y. Furukawa

Considering screeening of electron scattering interactions in terms of the finite-temperature STLS theory and solving the linearized Boltzmann equation (with no appeal to a relaxation time approximation), we present a theoretical analysis…

Materials Science · Physics 2011-06-08 S. Y. Liu , X. L. Lei , Norman J. M. Horing

Thermodynamics of a spin-1 Bose gas with ferromagnetic interactions are investigated via the mean-field theory. It is apparently shown in the specific heat curve that the system undergoes two phase transitions, the ferromagnetic transition…

Statistical Mechanics · Physics 2009-11-13 Chengjun Tao , Peilin Wang , Jihong Qin , Qiang Gu

While thermoelectric transport theory is well established and widely applied, there remains some degree of confusion on the proper thermodynamic definition of the Seebeck coefficient (or thermoelectric power) which is a measure of the…

Materials Science · Physics 2016-04-05 Y. Apertet , H. Ouerdane , C. Goupil , Ph. Lecoeur

The electronic properties of disordered systems at the Anderson metal-insulator transition (MIT) have been the subject of intense study for several decades. Thermoelectric properties at the MIT, such as thermopower and thermal conductivity,…

Mesoscale and Nanoscale Physics · Physics 2007-05-23 Alexander Croy , Rudolf A. Roemer

We construct and solve numerically the thermodynamic Bethe Ansatz equations for the spin-anisotropic two-channel Kondo model in arbitrary external field $h$. At high temperatures the specific heat and the susceptibility show power law…

Strongly Correlated Electrons · Physics 2009-11-07 G. Zarand , T. Costi , A. Jerez , N. Andrei

We report the first concurrent determination of conductance (G) and thermopower (S) of single-molecule junctions via direct measurement of electrical and thermoelectric currents using a scanning tunneling microscope-based break-junction…

Mesoscale and Nanoscale Physics · Physics 2012-01-10 J. R. Widawsky , P. Darancet , J. B. Neaton , L. Venkataraman

We report the thermoelectric transport properties in the orbital-ordered Mott insulating phase of Ca$_2$RuO$_4$ close to and far from equilibrium. Near equilibrium conditions where the temperature gradient is only applied to the sample, an…

Strongly Correlated Electrons · Physics 2017-09-21 Yasuo Nishina , Ryuji Okazaki , Yukio Yasui , Fumihiko Nakamura , Ichiro Terasaki

Thermoelectric transport phenomena in a single-level quantum dot coupled to ferromagnetic leads are considered theoretically in the Kondo regime. The dot is described by the Anderson model with Rashba type spin-orbit interaction. The…

Mesoscale and Nanoscale Physics · Physics 2014-12-10 Łukasz Karwacki , Piotr Trocha , Józef Barnaś

Thermodynamic quantities of the hard-sphere system in the steady state with a small heat flux are calculated within the continuous media approach. Analytical expressions for pressure, internal energy, and entropy are found in the…

Statistical Mechanics · Physics 2017-02-13 Y. A. Humenyuk

We derive the expressions for the transition temperature $(T_{c})$, and the spatial dependence of the superconducting gap for a multilayer high-$T_{c}$ superconductor composed of groups of tightly spaced planes separated by a larger…

Condensed Matter · Physics 2009-10-28 Krzysztof Byczuk , Jozef Spalek

The six independent elastic constants of Sr$_2$RuO$_4$ were determined using resonant ultrasound spectroscopy on a high-quality single-crystal specimen. The constants are in excellent agreement with those obtained from pulse-echo…

Superconductivity · Physics 2009-11-07 Johnpierre Paglione , C. Lupien , W. A. MacFarlane , J. M. Perz , Louis Taillefer , Z. Q. Mao , Y. Maeno

Dependence of transport coefficients of the Yb(Rh$_{1-x}$Co$_x$)$_2$Si$_2$ series of alloys on temperature and cobalt concentration is explained by an asymmetric Anderson model which takes into account the exchange scattering of conduction…

Strongly Correlated Electrons · Physics 2020-05-13 V. Zlatić , U. Stockert

An extensive analysis of an optically-thin, dry atmosphere at different values of the thermal Rossby number Ro and of the Taylor number Ff is per- formed with a general circulation model by varying the rotation rate {\Omega} and the surface…

Fluid Dynamics · Physics 2015-06-11 Salvatore Pascale , Francesco Ragone , Valerio Lucarini , Yixiong Wang , Robert Boschi

There is considerable evidence that the superconductivity of Sr2RuO4 has two components. Among this evidence is a jump in the shear elastic modulus $c_{66}$ at the critical temperature $T_c$, observed in ultrasound measurements. Such a jump…

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