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Title: Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz){sub 2}(ClO{sub 4}){sub 2}.

Abstract

We present an investigation of magnetic ordering in the two-dimensional S=1/2 quantum magnet Cu(Pz){sub 2}(ClO{sub 4}){sub 2} using specific heat and zero-field muon-spin relaxation ({mu}{sup +}SR). The magnetic contribution to the specific heat is consistent with an exchange strength of 17.7(3) K. We find unambiguous evidence for a transition to a state of three-dimensional long-range order below a critical temperature T{sub N} = 4.21(1) K using {mu}{sup +} SR even though there is no feature in the specific heat at that temperature. The absence of a specific heat anomaly at T{sub N} is consistent with recent theoretical predictions. The ratio of T{sub N}/J=0.24 corresponds to a ratio of intralayer to interlayer exchange constants of |J{prime}/J| = 6.8 x 10{sup -4}, indicative of excellent two-dimensional isolation. The scaled magnetic specific heat of [Cu(Pz){sub 2}(HF{sub 2})]BF{sub 4}, a compound with an analogous structure, is very similar to that of Cu(Pz){sub 2}(ClO{sub 4}){sub 2} although both differ slightly from the predicted value for an ideal 2D S=1/2 Heisenberg antiferromagnet.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Engineering and Physical Sciences Research Council (EPSRC); Research Corp.; 1851 Commission; CNPq; CAPES; FAPERJ
OSTI Identifier:
948796
Report Number(s):
ANL/MSD/JA-58565
Journal ID: ISSN 0163-1829; PRBMDO; TRN: US200907%%200
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. B; Journal Volume: 75; Journal Issue: 9 ; 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; COPPER COMPLEXES; MAGNETIC SPECIFIC HEAT; MAGNETS; PERCHLORATES; PYRAZINES; RELAXATION; SPIN; ORDER PARAMETERS; ANTIFERROMAGNETISM

Citation Formats

Lancaster, T., Blundell, S. J., Brooks, M. L., Baker, P. J., Pratt, F. L., Manson, J. L., Connor, M. M., Xiao, F., Landee, C. P., Chaves, F. A., Soriano, S., Novak, M. A., Papageorgiou, T., Bianchi, A., Wosnitza, J., Schlueter, J. A., Materials Science Division, Oxford Univ., Rutherford Appleton Lab., Eastern Washington Univ., Clark Univ., Inst. de Fisica, UFRJ, and Hochfeld-Magnetlabor Dresden. Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz){sub 2}(ClO{sub 4}){sub 2}.. United States: N. p., 2007. Web. doi:10.1103/PhysRevB.75.094421.
Lancaster, T., Blundell, S. J., Brooks, M. L., Baker, P. J., Pratt, F. L., Manson, J. L., Connor, M. M., Xiao, F., Landee, C. P., Chaves, F. A., Soriano, S., Novak, M. A., Papageorgiou, T., Bianchi, A., Wosnitza, J., Schlueter, J. A., Materials Science Division, Oxford Univ., Rutherford Appleton Lab., Eastern Washington Univ., Clark Univ., Inst. de Fisica, UFRJ, & Hochfeld-Magnetlabor Dresden. Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz){sub 2}(ClO{sub 4}){sub 2}.. United States. doi:10.1103/PhysRevB.75.094421.
Lancaster, T., Blundell, S. J., Brooks, M. L., Baker, P. J., Pratt, F. L., Manson, J. L., Connor, M. M., Xiao, F., Landee, C. P., Chaves, F. A., Soriano, S., Novak, M. A., Papageorgiou, T., Bianchi, A., Wosnitza, J., Schlueter, J. A., Materials Science Division, Oxford Univ., Rutherford Appleton Lab., Eastern Washington Univ., Clark Univ., Inst. de Fisica, UFRJ, and Hochfeld-Magnetlabor Dresden. Mon . "Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz){sub 2}(ClO{sub 4}){sub 2}.". United States. doi:10.1103/PhysRevB.75.094421.
@article{osti_948796,
title = {Magnetic order in the S=1/2 two-dimensional molecular antiferromagnet, copper pyrazine perchlorate Cu(Pz){sub 2}(ClO{sub 4}){sub 2}.},
author = {Lancaster, T. and Blundell, S. J. and Brooks, M. L. and Baker, P. J. and Pratt, F. L. and Manson, J. L. and Connor, M. M. and Xiao, F. and Landee, C. P. and Chaves, F. A. and Soriano, S. and Novak, M. A. and Papageorgiou, T. and Bianchi, A. and Wosnitza, J. and Schlueter, J. A. and Materials Science Division and Oxford Univ. and Rutherford Appleton Lab. and Eastern Washington Univ. and Clark Univ. and Inst. de Fisica, UFRJ and Hochfeld-Magnetlabor Dresden},
abstractNote = {We present an investigation of magnetic ordering in the two-dimensional S=1/2 quantum magnet Cu(Pz){sub 2}(ClO{sub 4}){sub 2} using specific heat and zero-field muon-spin relaxation ({mu}{sup +}SR). The magnetic contribution to the specific heat is consistent with an exchange strength of 17.7(3) K. We find unambiguous evidence for a transition to a state of three-dimensional long-range order below a critical temperature T{sub N} = 4.21(1) K using {mu}{sup +} SR even though there is no feature in the specific heat at that temperature. The absence of a specific heat anomaly at T{sub N} is consistent with recent theoretical predictions. The ratio of T{sub N}/J=0.24 corresponds to a ratio of intralayer to interlayer exchange constants of |J{prime}/J| = 6.8 x 10{sup -4}, indicative of excellent two-dimensional isolation. The scaled magnetic specific heat of [Cu(Pz){sub 2}(HF{sub 2})]BF{sub 4}, a compound with an analogous structure, is very similar to that of Cu(Pz){sub 2}(ClO{sub 4}){sub 2} although both differ slightly from the predicted value for an ideal 2D S=1/2 Heisenberg antiferromagnet.},
doi = {10.1103/PhysRevB.75.094421},
journal = {Phys. Rev. B},
number = 9 ; 2007,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}