Published March 18, 2015 | Version v1
Journal article Metadata-only

Pseudogap and the specific heat of high Tc superconductors: a Hubbard model in a n-pole approximation

Creators

  • 1. Laboratório de Teoria da Matéria Condensada, Departamento de Física – UFSM, 97105-900, Santa Maria, RS (Brazil)
  • 2. Instituto de Física, Universidade Federal Fluminense Av. Litorânea s/n, 24210, 346, Niterói, Rio de Janeiro (Brazil)
  • 3. Centro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180, Rio de Janeiro, RJ (Brazil)

Description

In this work the specific heat of a two-dimensional Hubbard model, suitable to discuss high-Tc superconductors (HTSC), is studied taking into account hopping to first (t) and second (t2) nearest neighbors. Experimental results for the specific heat of HTSC's, for instance, the YBCO and LSCO, indicate a close relation between the pseudogap and the specific heat. In the present work, we investigate the specific heat by the Green's function method within a n-pole approximation. The specific heat is calculated on the pseudogap and on the superconducting regions. In the present scenario, the pseudogap emerges when the antiferromagnetic (AF) fluctuations become sufficiently strong. The specific heat jump coefficient Δγ decreases when the total occupation per site (nT) reaches a given value. Such behavior of Δγ indicates the presence of a pseudogap in the regime of high occupation

Availability note (English)

Available from http://dx.doi.org/10.1088/1742-6596/592/1/012075

Additional details

Identifiers

DOI
10.1088/1742-6596/592/1/012075;

Publishing Information

Journal Title
Journal of Physics. Conference Series (Online)
Journal Volume
592
Journal Issue
1
Journal Page Range
[6 p.]
ISSN
1742-6596

Conference

Title
International conference on strongly correlated electron systems 2014
Acronym
SCES2014
Dates
7-14 Jul 2014
Place
Grenoble (France)

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
47113732
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ANTIFERROMAGNETISM; APPROXIMATIONS; BARIUM COMPOUNDS; COPPER COMPOUNDS; FLUCTUATIONS; HIGH-TC SUPERCONDUCTORS; HUBBARD MODEL; OCCUPATIONS; SPECIFIC HEAT; TWO-DIMENSIONAL CALCULATIONS; TWO-DIMENSIONAL SYSTEMS; YTTRIUM COMPOUNDS
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CALCULATION METHODS; CRYSTAL LATTICES; CRYSTAL MODELS; CRYSTAL STRUCTURE; MAGNETISM; MATHEMATICAL MODELS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TYPE-II SUPERCONDUCTORS; VARIATIONS