Jan’s Publications

@article{WOS:000266501100062,

title = {Phase diagram of the frustrated spatially-anisotropic S=1 

 antiferromagnet on a square lattice},

author = {H. C. Jiang and F. Kruger and J. E. Moore and D. N. Sheng and J. Zaanen and Z. Y. Weng},

doi = {10.1103/PhysRevB.79.174409},

issn = {2469-9950},

year  = {2009},

date = {2009-05-01},

journal = {PHYSICAL REVIEW B},

volume = {79},

number = {17},

publisher = {AMER PHYSICAL SOC},

address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA},

abstract = {We study the S=1 square lattice Heisenberg antiferromagnet with 

 spatially anisotropic nearest-neighbor couplings J(1x) and J(1y) 

 frustrated by a next-nearest-neighbor coupling J(2) numerically using 

 the density-matrix renormalization-group (DMRG) method and analytically 

 employing the Schwinger-Boson mean-field theory (SBMFT). Up to 

 relatively strong values of the anisotropy, within both methods we find 

 quantum fluctuations to stabilize the Neel-ordered state above the 

 classically stable region. Whereas SBMFT suggests a fluctuation-induced 

 first-order transition between the Neel state and a stripe antiferromagnet for 1/3 <= J(1x)/J(1y)<= 1 and an intermediate 

 paramagnetic region opening only for very strong anisotropy, the DMRG 

 results clearly demonstrate that the two magnetically ordered phases are 

 separated by a quantum-disordered region for all values of the 

 anisotropy with the remarkable implication that the quantum paramagnetic 

 phase of the spatially isotropic J(1)-J(2) model is continuously 

 connected to the limit of decoupled Haldane spin chains. Our findings indicate that for S=1 quantum fluctuations in strongly frustrated 

 antiferromagnets are crucial and not correctly treated on the 

 semiclassical level.},

keywords = {antiferromagnetism; frustration; Heisenberg model; magnetic anisotropy;   magnetic transitions; paramagnetic-antiferromagnetic transitions;   renormalisation},

pubstate = {published},

tppubtype = {article}

}