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Title: EPR study of the onset of long-range order in the 2D organo-metallic magnet Cu(pyz)2(pyo)2(PF6)2

Abstract

The spin (S) 1/2 two-dimensional (2D) square-lattice quantum Heisenberg antiferromagnet system has long been interesting to theoretical physicists due to the variety of transitions that can arise. Moreover, the role of S = 1/2 fluctuations on a square lattice in the mechanism for cuprate superconductivity is hotly debated. Low dimensional metal-organic magnets, such as Cu(pyz){sub 2}(pyo){sub 2}(PF{sub 6}){sub 2}, offer the possibility to readily control the exchange parameters in a 20 system by changing chemical composition, thus creating spin architectures with desirable properties 'to order'. For a perfectly 20 system, long range magnetic order would not occur at finite temperature. However, in the metal-organic systems, interlayer coupling gives rise to a finite Neel temperature. For these quasi-2D systems the ordering temperature is dominated by the weakest (the interlayer) exchange interaction, whereas the saturation magnetic field is dominated by the strongest exchange interactions, thus providing a means of estimating the spatial exchange anisotropy in the system. It should be noted that the more 2D the system, the wider the temperature (T) range, T{sub N} < T < J/k{sub B}, over which magnetic fluctuations dominate. As evident by the ratio of magnetic saturation field, H{sub sat} {approx} 30 T, to the Neelmore » temperature, T{sub N} = 1.72 K, Cu(pyz){sub 2}(pyo){sub 2}(PF{sub 6}){sub 2} is a good example of a 2D system with the anisotropy between inplane and interplane exchange interactions being of the order of 10{sup 3}.« less

Authors:
 [1];  [1];  [1];  [2];  [2];  [3]
  1. Los Alamos National Laboratory
  2. OXFORD
  3. EWU
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1047131
Report Number(s):
LA-UR-11-00331; LA-UR-11-331
TRN: US1203862
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ANISOTROPY; CHEMICAL COMPOSITION; CUPRATES; EXCHANGE INTERACTIONS; FLUCTUATIONS; MAGNETIC FIELDS; MAGNETS; NEEL TEMPERATURE; SATURATION; SPIN; SUPERCONDUCTIVITY

Citation Formats

Mcdonald, Ross D, Ayala - Valenzuela, Oscar E, Singleton, John, Goddard, Paul A, Franke, I, and Manson, J L. EPR study of the onset of long-range order in the 2D organo-metallic magnet Cu(pyz)2(pyo)2(PF6)2. United States: N. p., 2011. Web.
Mcdonald, Ross D, Ayala - Valenzuela, Oscar E, Singleton, John, Goddard, Paul A, Franke, I, & Manson, J L. EPR study of the onset of long-range order in the 2D organo-metallic magnet Cu(pyz)2(pyo)2(PF6)2. United States.
Mcdonald, Ross D, Ayala - Valenzuela, Oscar E, Singleton, John, Goddard, Paul A, Franke, I, and Manson, J L. Fri . "EPR study of the onset of long-range order in the 2D organo-metallic magnet Cu(pyz)2(pyo)2(PF6)2". United States. https://www.osti.gov/servlets/purl/1047131.
@article{osti_1047131,
title = {EPR study of the onset of long-range order in the 2D organo-metallic magnet Cu(pyz)2(pyo)2(PF6)2},
author = {Mcdonald, Ross D and Ayala - Valenzuela, Oscar E and Singleton, John and Goddard, Paul A and Franke, I and Manson, J L},
abstractNote = {The spin (S) 1/2 two-dimensional (2D) square-lattice quantum Heisenberg antiferromagnet system has long been interesting to theoretical physicists due to the variety of transitions that can arise. Moreover, the role of S = 1/2 fluctuations on a square lattice in the mechanism for cuprate superconductivity is hotly debated. Low dimensional metal-organic magnets, such as Cu(pyz){sub 2}(pyo){sub 2}(PF{sub 6}){sub 2}, offer the possibility to readily control the exchange parameters in a 20 system by changing chemical composition, thus creating spin architectures with desirable properties 'to order'. For a perfectly 20 system, long range magnetic order would not occur at finite temperature. However, in the metal-organic systems, interlayer coupling gives rise to a finite Neel temperature. For these quasi-2D systems the ordering temperature is dominated by the weakest (the interlayer) exchange interaction, whereas the saturation magnetic field is dominated by the strongest exchange interactions, thus providing a means of estimating the spatial exchange anisotropy in the system. It should be noted that the more 2D the system, the wider the temperature (T) range, T{sub N} < T < J/k{sub B}, over which magnetic fluctuations dominate. As evident by the ratio of magnetic saturation field, H{sub sat} {approx} 30 T, to the Neel temperature, T{sub N} = 1.72 K, Cu(pyz){sub 2}(pyo){sub 2}(PF{sub 6}){sub 2} is a good example of a 2D system with the anisotropy between inplane and interplane exchange interactions being of the order of 10{sup 3}.},
doi = {},
url = {https://www.osti.gov/biblio/1047131}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {1}
}