Magnetic properties and exchange integrals of the frustrated chain cuprate linarite PbCuSO4(OH)2

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dc.contributor.authorWolter, AUBen_AU
dc.contributor.authorLipps, Fen_AU
dc.contributor.authorSchäpers, Men_AU
dc.contributor.authorDrechsler, SLen_AU
dc.contributor.authorNishimoto, Sen_AU
dc.contributor.authorVogel, Ren_AU
dc.contributor.authorKataev, Ven_AU
dc.contributor.authorBüchner, Ben_AU
dc.contributor.authorRosner, Hen_AU
dc.contributor.authorSchmitt, Men_AU
dc.contributor.authorUhlarz, Men_AU
dc.contributor.authorSkourski, Yen_AU
dc.contributor.authorWosnitza, Jen_AU
dc.contributor.authorSüllow, Sen_AU
dc.contributor.authorRule, KCen_AU
dc.date.accessioned2014-04-22T02:53:11Zen_AU
dc.date.available2014-04-22T02:53:11Zen_AU
dc.date.issued2012-01-05en_AU
dc.date.statistics2014-04-22en_AU
dc.description.abstractWe present a detailed study in the paramagnetic regime of the frustrated s = 1/2 spin-compound linarite PbCuSO4(OH)(2) with competing ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchange interactions. Our data reveal highly anisotropic values for the saturation field along the crystallographic main directions, with similar to 7.6, similar to 10.5, and similar to 8.5 T for the a, b, and c axes, respectively. In the paramagnetic regime, this behavior is explained mainly by the anisotropy of the g factor, but leaving room for an easy-axis exchange anisotropy. Within the isotropic J(1)-J(2) spin model, our experimental data are described by various theoretical approaches, yielding values for the exchange interactions J(1) similar to -100 K and J(2) similar to 36 K. These main intrachain exchange integrals are significantly larger as compared to the values derived in two previous studies in the literature and shift the frustration ratio alpha = J(2)/vertical bar J(1)vertical bar approximate to 0.36 of linarite closer to the one-dimensional critical point at 0.25. Electron spin resonance (ESR) and nuclear magnetic resonance (NMR) measurements further prove that the static susceptibility is dominated by the intrinsic spin susceptibility. The Knight shift as well as the broadening of the linewidth in ESR and NMR at elevated temperatures indicate a highly frustrated system with the onset of magnetic correlations far above the magnetic ordering temperature T-N = 2.75(5) K, in agreement with the calculated exchange constants. © 2012, American Physical Society.en_AU
dc.identifier.articlenumber014407en_AU
dc.identifier.citationWolter, A. U. B., Lipps, F., Schäpers, M., Drechsler, S. L., Nishimoto, S., Vogel, R., Kataev, V., Büchner, B., Rosner, H., Schmitt, M., Uhlarz, M., Skourski, Y., Wosnitza, J., Süllow, S., & Rule, K. C. (2012). Magnetic properties and exchange integrals of the frustrated chain cuprate linarite PbCuSO4(OH)2. Physical Review B, 85, 014407. doi:10.1103/PhysRevB.85.014407en_AU
dc.identifier.govdoc4587en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.85.014407en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5461en_AU
dc.identifier.volume85en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectNuclear magnetic resonanceen_AU
dc.subjectElectron spin resonanceen_AU
dc.subjectThermodynamicsen_AU
dc.subjectParamagnetismen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectFerromagnetismen_AU
dc.titleMagnetic properties and exchange integrals of the frustrated chain cuprate linarite PbCuSO4(OH)2en_AU
dc.typeJournal Articleen_AU
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