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Anomalous spin dynamics in the coupled spin tetramer systemCuSeO3
Lee, S.,Lee, W.-J.,van Tol, J.,Kuhns, P. L.,Reyes, A. P.,Berger, H.,Choi, K.-Y. American Physical Society 2017 Physical Review B Vol.95 No.5
<P>We report high-field magnetization, high-frequency electron spin resonance (ESR), and Se-77 nuclear magnetic resonance (NMR) measurements on the linear spin tetramer system CuSeO3, consisting of strongly interacting Cu(1) dimers and weakly coupled Cu(2) spins. The magnetization exhibits anisotropic half-step magnetization plateaus at mu H-0 = 45 T, depending on a crystallographic orientation. A temperature dependence of the ESR linewidth Delta H-pp in a paramagnetic phase points towards the significance of anisotropic exchange interactions. Below T-N = 9-10 K long-range magnetic order is evidenced by the observation of a critical divergence of both Delta H-pp(T) and the nuclear spin-lattice relaxation rate 1/T-1. In addition, we identify a magnetic anomaly at T* = 6.0(5) K below T-N, which is caused by a spin reorientation. The nuclear spin-spin relaxation rate 1/T-2 unveils the development of site-specific spin correlations. The intriguing magnetism of CuSeO3 is discussed in terms of the energy hierarchy of Cu(1) and Cu(2) spins in concert with additional intertetramer interactions.</P>
Coexistence of localized and collective magnetism in the coupled-spin-tetrahedra systemCu4Te5O12Cl4
Choi, Kwang-Yong,Do, Seunghwan,Lemmens, Peter,van Tol, Johan,Shin, Jiseon,Jeon, Gun Sang,Skourski, Yurii,Rhyee, Jong-Soo,Berger, Helmuth American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.90 No.18
Spin Dynamics of the S = 1/2 Pyrochlore System Cu_2(OH)_3Cl Studied by Using High-frequency ESR
J. S. Park,최광용,A. N. Ponomaryov,Z. Wang,J. van Tol,옥강민,장지훈,S. W. Yoon,서병진 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.2
We report a magnetization and electron spin resonance (ESR) study of the clinoatacamite Cu_2(OH)_3Cl, which is known to have a S = 1/2 distorted pyrochlore lattice. The static magnetic susceptibility shows a strong increase at temperatures below T_(N2) = 6.4 K without any appreciable anomalies at T_(N1) = 18.1 K. The magnetization vs. field curve exhibits the presence of a weak ferromagnetic moment of 0.1 µB/Cu at T = 2 K, possibly due to an antisymmetric Dzyaloshinsky-Moriya (DM) interaction and/or weak ferromagnetic interplane interactions. From the ESR linewidth, we estimate the magnitude of the DM interaction as 10% of the leading isotropic exchange interaction, J ∼ 170 K. The temperature dependence of the linewidth is characterized by three distinct temperature regions: (i) a high-temperature exchange narrowing region at temperatures above 170 K, (ii) a two-dimensional short-range ordered region at temperatures between 170 K and 36 K, and (iii) a low-temperature region at temperatures below 36 K where an antiferromagnetic-like resonance mode develops. The evolution of the ESR linewidth is comparable to that of the S = 1/2 kagomé lattice in Cu_3Zn(OH)_6Cl_2 [Zorko et al., Phys. Rev. Lett. 101, 02640 (2008)]. This suggests that the magnetic properties of Cu_2(OH)_3Cl may be described in terms of a stack of kagomé lattices.
Hyperfine structure of Sc@C<sub>82</sub> from ESR and DFT
Morley, G W,Herbert, B J,Lee, S M,Porfyrakis, K,Dennis, T J S,Nguyen-Manh, D,Scipioni, R,van Tol, J,Horsfield, A P,Ardavan, A,Pettifor, D G,Green, J C,Briggs, G A D IOP Pub 2005 Nanotechnology Vol.16 No.11
<P>The electron spin <I>g</I>-?and hyperfine tensors of the endohedral metallofullerene Sc@C<SUB>82</SUB> are anisotropic. Using electron spin resonance (ESR) and density functional theory (DFT), we can relate their principal axes to the coordinate frame of the molecule, finding that the <I>g</I>-tensor is not axially symmetric. The Sc bond with the cage is partly covalent and partly ionic. Most of the electron spin density is distributed around the carbon cage, but 5% is associated with the scandium d<SUB><I>yz</I></SUB> orbital, and this drives the observed anisotropy. </P>