Neutron diffraction study on the two-dimensional Ising system KEr(MoO{sub 4}){sub 2}

• Published in: Physical review. B, Condensed matter and materials physics Vol. 82; no. 18
• Main Authors: Mat'as, Slavomir, Dudzik, Esther, Feyerherm, Ralf, Gerischer, Sebastian, Klemke, Sebastian, Prokes, Karel, Orendacova, Alzbeta, Helmholtz-Zentrum fuer Materialien und Energie GmbH, Hahn Meitner Platz 1, D-14109 Berlin, University of P. J. Safarik, Park Angelinum 9, 040 01 Kosice
• Format: Journal Article
• Language: English
• Published: United States 23-11-2010
• Subjects: ALKALI METAL COMPOUNDS; ANTIFERROMAGNETIC MATERIALS; COHERENT SCATTERING; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTAL MODELS; DIFFRACTION; ERBIUM COMPOUNDS; ISING MODEL; MAGNETIC FIELDS; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MAGNETIZATION; MATERIALS; MATHEMATICAL MODELS; MOLYBDATES; MOLYBDENUM COMPOUNDS; NEEL TEMPERATURE; NEUTRON DIFFRACTION; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; POTASSIUM COMPOUNDS; RARE EARTH COMPOUNDS; REFRACTORY METAL COMPOUNDS; SCATTERING; SPECIFIC HEAT; TEMPERATURE RANGE; TEMPERATURE RANGE 0000-0013 K; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE
• ISSN: 1098-0121; 1550-235X
• DOI: 10.1103/PHYSREVB.82.184427

The magnetic properties of the two-dimensional Ising antiferromagnet KEr(MoO{sub 4}){sub 2} have been investigated below and above transition temperature T{sub N}{approx}0.95 K in zero field and in fields up to 6.5 T by means of elastic neutron-diffraction, heat-capacity, and magnetization measurements. The low-temperature signal recorded at 0.34 K by neutron diffraction is explained within a noncollinear magnetic structure model. However, additional contribution is also present when applying the external magnetic field along the c axis even at temperatures well above the magnetic transition temperature T{sub N}. Various explanations are discussed.