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The thermodynamical phenomenological theory of magnetically active superconducting materials and magnetic-superconducting heterostructures is presented. The materials may exhibit arbitrarily strong anisotropy, parametric or structural.…

Superconductivity · Physics 2010-12-20 Dominik Rogula , Małgorzata Sztyren

Recently the anomalous behaviour of Fermions below the Fermi temperature was analysed in detail from different viewpoints. In the present communication we obtain a justification for this anomalous semionic behaviour and also obtain the…

General Physics · Physics 2015-06-26 B. G. Sidharth

The temperature dependence of commutator anomalies is discussed on the explicit example of particular (anyonic) field operators in two dimensions. The correlation functions obtained show that effects of the non-zero temperature might…

High Energy Physics - Theory · Physics 2015-06-25 Nevena Ilieva

From an analysis of the specific heat of one of the cuprate superconductors it is shown, that even if a large part of the experimental specific heat associated with the superconducting phase transition is due to fluctuations, this part must…

Strongly Correlated Electrons · Physics 2009-11-07 D. van der Marel , A. J. Leggett , J. W. Loram , J. R. Kirtley

Superconductors with low superfluid density can be described by XY models. In such models the scale of the transition temperature T_c is largely set by the zero temperature phase stiffness (helicity modulus), a long-wavelength property of…

Superconductivity · Physics 2007-05-23 Y. L. Loh , E. W. Carlson

We show that the strong Nernst signal observed recently in amorphous superconducting films far above the critical temperature is caused by the fluctuations of the superconducting order parameter. We demonstrate a striking agreement between…

Superconductivity · Physics 2015-05-13 Karen Michaeli , Alexander M. Finkel'stein

The recent report of superconductivity under high pressure at the record transition temperature of Tc=203K in sulfur hydride has been identified as conventional in view of the observation of an isotope effect upon deuteration. Here it is…

Superconductivity · Physics 2016-05-24 Annette Bussmann-Holder , Jurgen Kohler , M. -H. Whangbo , Antonio Bianconi , Arndt Simon

We suggest that the high-temperature superconductivity is attributed to the director-roles of van Hove singularity between electron-electron interaction and electron-phonon interaction. Difference between the critical temperature and…

Superconductivity · Physics 2013-01-08 Tian De Cao

An analytical model of high frequency oscillations of the kinetic and potential energies in a one-dimensional harmonic crystal with a substrate potential is obtained by introducing the nonlocal energies [1]. A generalization of the kinetic…

Statistical Mechanics · Physics 2018-02-07 Mikhail B. Babenkov , Anton M. Krivtsov , Denis V. Tsvetkov

Superconductivity is characterized by a nonvanishing superconducting pair amplitude. It has a definite symmetry in spin, momentum and frequency (time). While the spin and momentum symmetry have been probed experimentally for different…

Mesoscale and Nanoscale Physics · Physics 2018-10-31 Sun-Yong Hwang , Pablo Burset , Björn Sothmann

We revisit the interlayer tunneling theory of high temperature superconductors and formulate it as a mechanism by which the striking systematics of the transition temperature within a given homologous series can be understood. We pay…

Superconductivity · Physics 2008-07-16 Angela Kopp , Sudip Chakravarty

Recent neutron scattering experiments in YBCO exhibit an unusual magnetic peak that appears only below the superconducting transition temperature. The experimental observations are explained within the context of the interlayer tunneling…

Condensed Matter · Physics 2009-10-28 L. Yin , S. Chakravarty , P. W. Anderson

We use alternative quantisation of the D3-D5 system to explore properties of a strongly coupled anyon material at finite density and temperature. We study the transport properties of the material and find both diffusion and massive…

High Energy Physics - Theory · Physics 2016-01-27 Daniel K. Brattan

The superconductor YB6 has the second highest critical temperature Tc among the boride family MBn. We report measurements of the specific heat, resistivity, magnetic susceptibility and thermal expansion from 2 to 300 K, using a single…

Superconductivity · Physics 2009-11-11 R. Lortz , Y. Wang , U. Tutsch , S. Abe , C. Meingast , P. Popovich , W. Knafo , N. Shitsevalova , Yu. B. Paderno , A. Junod

We propose a new mixed-mechanism for superconductors, which addresses not only low- but also high-, and even possible room-temperature superconductivity. We use this mixed-mechanism to explain superconductivity in different temperature…

Superconductivity · Physics 2013-11-05 D. H. Lin , D. J. Cui , B. Li , L. F. Liu , X. Q. Wang

The two-band model possessing metal and semiconductor properties is offered. This model may explain the appearance of temperature maximum of the electrical resistance at the proper relationships between the parameters of the theory. The…

Strongly Correlated Electrons · Physics 2011-02-22 Boris V. Karpenko , Alexander V. Kuznetzov

We investigate the superconducting mechanism and the transition temperature of heav y fermion superconductor UPd_2Al_3 on the basis of a single band two-dimensional Hubbard model on triangular lattice, whi ch represents the most heavy band…

Strongly Correlated Electrons · Physics 2007-05-23 Yunori Nisikawa , Kosaku Yamada

The response of the worldwide scientific community to the discovery in 2008 of superconductivity at Tc = 26 K in the Fe-based compound LaFeAsO_{1-x}F_x has been very enthusiastic. In short order, other Fe-based superconductors with the same…

Superconductivity · Physics 2015-03-17 David C. Johnston

We study heat transport in normal/superconducting graphene junctions. We find that while the thermal conductance displays the usual exponential dependence on temperature, reflecting the s-wave symmetry of the superconductor, it exhibits an…

Superconductivity · Physics 2009-11-13 Takehito Yokoyama , Jacob Linder , Asle Sudbo

The behavior of electrical resistivity rho(T), temperature of superconducting transition Tc, and upper critical field Hc2(T) of polycrystalline YNi2B2C after irradiation with thermal neutron and subsequent high-temperature isochronous…

Superconductivity · Physics 2013-03-06 A. E. Karkin , Yu. N. Akshentsev , B. N. Goshchitskii