Phases of the spin-21 Heisenberg antiferromagnet on the diamond-decorated square lattice in a magnetic field

被引:4
作者
Caci, Nils [1 ,2 ]
Karl'ova, Katarina [3 ]
Verkholyak, Taras [4 ]
Strecka, Jozef [3 ]
Wessel, Stefan [1 ,2 ]
Honecker, Andreas [5 ]
机构
[1] Rhein Westfal TH Aachen, Inst Theoret Solid State Phys, JARA FIT, D-52056 Aachen, Germany
[2] Rhein Westfal TH Aachen, JARA CSD, D-52056 Aachen, Germany
[3] Safarik Univ, Fac Sci, Dept Theoret Phys & Astrophys, Pk Angelinum 9, Kosice 04001, Slovakia
[4] Natl Acad Sci Ukraine, Inst Condensed Matter Phys, Svientsitskii St 1, UA-79011 Lvov, Ukraine
[5] CY Cergy Paris Univ, Lab Phys Theor & Modelisat, CNRS UMR 8089, F-95000 Cergy Pontoise, France
关键词
DIMER GROUND-STATE; ORDER; TRANSITION; PLATEAUS; DENSITY; MODEL; SRCU2(BO3)(2); EXCITATIONS; STATISTICS;
D O I
10.1103/PhysRevB.107.115143
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The spin-1/2 Heisenberg antiferromagnet on the frustrated diamond-decorated square lattice is known to feature various zero-field ground-state phases, consisting of extended monomer-dimer and dimer-tetramer ground states as well as a ferrimagnetic regime. Using a combination of analytical arguments, density matrix renormalization group (DMRG), exact diagonalization as well as sign-problem-free quantum Monte Carlo (QMC) calculations, we investigate the properties of this system and the related Lieb lattice in the presence of a finite magnetic field, addressing both the ground-state phase diagram as well as several thermodynamic properties. In addition to the zero-field ground states, we find at high magnetic field a spin-canted phase with a continuously rising magnetization for increasing magnetic field strength as well as the fully polarized paramagnetic phase. At intermediate field strength, we identify a first-order quantum phase transition line between the ferrimagnetic and the monomer-dimer regime. This first-order line extends to finite temperatures, terminating in a line of critical points that belong to the universality class of the two-dimensional Ising model.
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页数:14
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