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https://open.uns.ac.rs/handle/123456789/9941
Title: | Critical spin fluctuations in the two-dimensional antiferromagnet KFeF4: A Mössbauer study | Authors: | Slivka, Jaroslav Keller H. Kündig W. Wanklyn B. |
Issue Date: | 1-Jan-1984 | Journal: | Physical Review B | Abstract: | The critical spin fluctuations in the two-dimensional antiferromagnet KFeF4 were investigated above TN=136.15 K in detail by means of Fe57 Mössbauer spectroscopy. Evidence is given that the critical dynamics of KFeF4 falls within the dynamic universality class (d,n)=(2,1). The dynamic critical exponent z was deduced from the longitudinal spin-autocorrelation time in the reduced temperature range 4×10-4<t<10-1. It is shown that the dynamic critical behavior of KFeF4 is in agreement with conventional theory (z=1.75) with z=1.77(5) down to at least t 5×10-3. However, closer to TN our data seem to indicate a small deviation from conventional behavior with z=1.54(6). Possible reasons for this deviation are discussed. © 1984 The American Physical Society. | URI: | https://open.uns.ac.rs/handle/123456789/9941 | ISSN: | 01631829 | DOI: | 10.1103/PhysRevB.30.3649 |
Appears in Collections: | Naučne i umetničke publikacije |
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