Magnetic analogue of liquid-gas phase transition of water: case study of a spin-1/2 Ising-Heisenberg model on a diamond-decorated square lattice

arXiv (Cornell University)

Abstract

The spin-1/2 Ising-Heisenberg model on a diamond-decorated square lattice exhibits an intriguing temperature-driven phase transition in a magnetic field between a classical ferrimagnetic phase and a quantum monomer-dimer phase. A generalized decoration-iteration transformation accurately maps the considered model to an effective spin-1/2 Ising model on a square lattice with temperature-dependent effective interactions and field, whereby the effective field vanishes at the phase boundary separating the classical ferrimagnetic phase from the quantum monomer-dimer phase. Typical features of the magnetization, magnetic susceptibility and specific heat in the vicinity of discontinuous and continuous thermal phase transitions between the classical ferrimagnetic phase and the quantum monomer-dimer phase are elucidated.

Authors 6

1. Jozef Strečka

   University of Pavol Jozef Šafárik · Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine

   Affiliation as printed

   Institute for Condensed Matter Physics , NASU , Svientsitskii Street 1 , 790 11 , L'viv , Ukraine, N. Caci ,

   P.J. Safarik University (Slovakia)

2. Katarína Karľová

   University of Pavol Jozef Šafárik

   Affiliation as printed

   P.J. Safarik University (Slovakia)

3. Taras Verkholyak

   Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine

   Affiliation as printed

   Institute of Condensed Matter Physics, Lviv, Ukraine (Ukraine)

4. Nils Caci Aachen

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen - RWTH Aachen University = Rheinisch-Westfälische Technische Hochschule Aachen (RWTH Aachen – Templergraben 55 – 52062 Aachen (Hausanschrift) – 52056 Aachen (Postanschrift) – Deutschland - Germany)

5. Stefan Weßel Aachen

   RWTH Aachen University · University of Pavol Jozef Šafárik

   Affiliation as printed

   Institute of Physics , Faculty of Science , P. J. Šafárik University , Park Angelinum 9 , 04001 Košice , Slovakia,

   RWTH Aachen - RWTH Aachen University = Rheinisch-Westfälische Technische Hochschule Aachen (RWTH Aachen – Templergraben 55 – 52062 Aachen (Hausanschrift) – 52056 Aachen (Postanschrift) – Deutschland - Germany)

6. A. Honecker

   Laboratoire de Physique Théorique et Modélisation · Université de Cergy-Pontoise

   Affiliation as printed

   LPTM - UMR 8089 - Laboratoire de Physique Théorique et Modélisation (Université de Cergy-Pontoise 2 avenue Adolphe Chauvin, Pontoise 95302 Cergy-Pontoise cedex - France)