Realization of a spin-1/2 spatially anisotropic square lattice in a quasi-two-dimensional quantum antiferromagnet Cu(en)(H2O)(2)SO4

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27740%2F17%3A10237845" target="_blank" >RIV/61989100:27740/17:10237845 - isvavai.cz</a>

Result on the web

<a href="https://journals.aps.org/prb/pdf/10.1103/PhysRevB.95.054436" target="_blank" >https://journals.aps.org/prb/pdf/10.1103/PhysRevB.95.054436</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.95.054436" target="_blank" >10.1103/PhysRevB.95.054436</a>

Result language

angličtina

Original language name

Realization of a spin-1/2 spatially anisotropic square lattice in a quasi-two-dimensional quantum antiferromagnet Cu(en)(H2O)(2)SO4

Original language description

Theoretical and experimental studies of a quasi-two-dimensional quantum antiferromagnet Cu(en)(H2O)(2)SO4 (en = C2H8N2) were performed. ab initio calculations of exchange interactions confirmed that the system represents a realization of a spatially anisotropic zigzag square lattice. Corresponding quantum Monte Carlo calculations of thermodynamic quantities were realized and the results were applied in the analysis of experimental susceptibility, magnetization, and specific heat studied at temperatures ranging from nominally 300 mK up to 8 K and magnetic fields up to 14 T. The analysis of experimental results provided the estimates of intralayer exchange couplings, J/k(B) = 3.5 +/- 0.2 K and J (1) = 0.35 J. Theoretical analysis of spin symmetries in Cu( en)( H2O) 2SO4 structure predicted the presence of symmetric exchange anisotropies (out- of plane and in-plane spin anisotropy) and a spin-flop transition within the easy plane induced by the magnetic field applied along the easy axis. Isothermal magnetization measurements indicated the expected transition in the field 200 mT applied along the b axis which was finally identified as the easy axis lying within the easy plane bc. Magnetic phase diagrams with saturation fields about 6.5 T show nearly identical behavior in all studied directions. Differences appear only in weak magnetic fields as a result of the presence of weak exchange anisotropies approximate to 10(-3) J. The present analysis suggests that Cu( en)( H2O) 2SO4 can be a model system for exploring the interplay of quantum fluctuations, exchange anisotropies, and magnetic field in the two-dimensional lattice space.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review B - Condensed Matter and Materials Physics

ISSN

1098-0121

e-ISSN

—

Volume of the periodical

95

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

054436

UT code for WoS article

000395987700003

EID of the result in the Scopus database

—