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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Physical Review B - Condensed Matter and Materials Physics

ISSN

1098-0121

e-ISSN

—

Svazek periodika

95

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

054436

Kód UT WoS článku

000395987700003

EID výsledku v databázi Scopus

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