High frequency ESR measurements of antiferromagnetic state in quantum spin system

Mitsudo, S.; Yamagishi, Masakazu; Fujita, Toshiyuki; Fujimoto, Y.; Toda, Masaya; Idehara, T.; Hase, Masashi

doi:10.1016/j.jmmm.2006.10.393

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…Indeed, this possibility has been thoroughly explored by tuning magnetic couplings via several different routes. It has turned out that the application of chemical or external pressure causes many-sided effects on structural and magnetic properties [12][13][14][15]. For example, external pressure induces a magnetic phase transition with no spontaneous magnetic moment [12,13], whereas chemical substitution alters a crystal structure, leading to a change of the underlying spin model [14,15].…”

Section: Introductionmentioning

confidence: 99%

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-
Lee
¹
,
Do
²
,
Yoon
³

et al. 2014
Phys. Rev. B
10
3
6
0
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We report 11 B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu 2 (BO 3) 2 , which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at T N = 9.8 K by a critical divergence of the nuclear spin-lattice relaxation rate 1/T 1 and an appearance of well-defined muon-spin precessions. In addition, we find the spectroscopic signature for a magnetic anomaly at T * = 6.5 K, a few kelvins below T N. For temperatures below T * , 1/T 1 ceases to follow a T 4.9(1) behavior. Instead, upon cooling below T * , both 1/T 1 and 1/T 2 become temperature-independent with a subsequent small drop. The muon frequency and the relative fraction of the Cu magnetic sites show anomalies mostly for Cu(2) spins at T *. This is ascribed to a Cu(2) spin reorientation. Site-specific change in magnetic structure is discussed in terms of the energy hierarchy of involved exchange interactions and an additional intertetramer interaction that controls magnetism at temperature T * .

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Section: Introductionmentioning

confidence: 99%

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-
Lee
¹
,
Do
²
,
Yoon
³

et al. 2014
Phys. Rev. B
10
3
6
0
View full text Add to dashboard Cite

show abstract

“…Indeed, the compound CdCu 2 (BO 3 ) 2 exists, and its magnetic properties have been investigated experimentally. [24][25][26] In contrast to SrCu 2 (BO 3 ) 2 , the magnetic GS of CdCu 2 (BO 3 ) 2 is long-range ordered, while the magnetization M (H) curve exhibits a plateau at one-half of the saturation magnetization. 24 The substitution of Sr by Cd in SrCu 2 (BO 3 ) 2 is accompanied by a structural transformation.…”

Section: Introductionmentioning

confidence: 99%

Decorated Shastry-Sutherland lattice in the spin-12magnet CdCu2(BO3)
Janson
¹
,
Rousochatzakis
²
,
Tsirlin
³

et al. 2012
Phys. Rev. B

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We report the microscopic magnetic model for the spin-1 2 Heisenberg system CdCu2(BO3)2, one of the few quantum magnets showing the 1 2 -magnetization plateau. Recent neutron diffraction experiments on this compound [M. Hase et al., Phys. Rev. B 80, 104405 (2009)] evidenced longrange magnetic order, inconsistent with the previously suggested phenomenological magnetic model of isolated dimers and spin chains. Based on extensive density-functional theory band structure calculations, exact diagonalizations, quantum Monte Carlo simulations, third-order perturbation theory, as well as high-field magnetization measurements, we find that the magnetic properties of CdCu2(BO3)2 are accounted for by a frustrated quasi-2D magnetic model featuring four inequivalent exchange couplings: the leading antiferromagnetic coupling J d within the structural Cu2O6 dimers, two interdimer couplings Jt1 and Jt2, forming magnetic tetramers, and a ferromagnetic coupling Jit between the tetramers. Based on comparison to the experimental data, we evaluate the ratios of the leading couplings J d : Jt1 : Jt2 : Jit = 1 : 0.20 : 0.45 : −0.30, with J d of about 178 K. The inequivalence of Jt1 and Jt2 largely lifts the frustration and triggers long-range antiferromagnetic ordering. The proposed model accounts correctly for the different magnetic moments localized on structurally inequivalent Cu atoms in the ground-state magnetic configuration. We extensively analyze the magnetic properties of this model, including a detailed description of the magnetically ordered ground state and its evolution in magnetic field with particular emphasis on the 1 2 -magnetization plateau. Our results establish remarkable analogies to the Shastry-Sutherland model of SrCu2(BO3)2, and characterize the closely related CdCu2(BO3)2 as a material realization for the spin-1 2 decorated anisotropic Shastry-Sutherland lattice.

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“…Although we have studied many magnetic materials with fascinating properties [2,5,6,7,8], only an example [9] is presented in this digest. (CPA) 2 CuBr 4 belongs to a spin ladder system with two legs [10].…”

Section: Esr Studies Of a Spin Ladder Systemmentioning

confidence: 99%

Development of a millimeter and submillimeter wave ESR measurement system

Fujita

Mitsudo

Idehara

et al. 2007

2007 Joint 32nd International Conference on Infrared and Millimeter Waves and the 15th International Conference on Terahertz El

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In our facility, FIR center Fukui University Japan, several radiation sources of millimeter-and submillimeter-wave are available in addition to high power and high frequency gyrotrons that have been developed successfully. We have developed millimeter and submillimeter wave ESR measurement systems, mainly, to study magnetism at low temperature and in high magnetic field. The ESR measurement systems in our facilities and also recent results of the research of the magnetism are presented.

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High frequency ESR measurements of antiferromagnetic state in quantum spin system

Cited by 6 publications

References 3 publications

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-
Lee
¹
,
Do
²
,
Yoon
³

et al. 2014
Phys. Rev. B
10
3
6
0
View full text Add to dashboard Cite

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-
Lee
¹
,
Do
²
,
Yoon
³

et al. 2014
Phys. Rev. B
10
3
6
0
View full text Add to dashboard Cite

Decorated Shastry-Sutherland lattice in the spin-12magnet CdCu2(BO3)
Janson
¹
,
Rousochatzakis
²
,
Tsirlin
³

et al. 2012
Phys. Rev. B

Development of a millimeter and submillimeter wave ESR measurement system

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High frequency ESR measurements of antiferromagnetic state in quantum spin system

Cited by 6 publications

References 3 publications

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-Lee1, Do2, Yoon3 et al. 2014Phys. Rev. B10360View full textAdd to dashboardCite

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-Lee1, Do2, Yoon3 et al. 2014Phys. Rev. B10360View full textAdd to dashboardCite

Decorated Shastry-Sutherland lattice in the spin-12magnet CdCu2(BO3)Janson1, Rousochatzakis2, Tsirlin3 et al. 2012Phys. Rev. B

Development of a millimeter and submillimeter wave ESR measurement system

Contact Info

Product

Resources

About

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-
Lee
¹
,
Do
²
,
Yoon
³

et al. 2014
Phys. Rev. B
10
3
6
0
View full text Add to dashboard Cite

Anomalous spin dynamics inCdCu2(BO3)2revealed by11BNMR and ZF-
Lee
¹
,
Do
²
,
Yoon
³

et al. 2014
Phys. Rev. B
10
3
6
0
View full text Add to dashboard Cite

Decorated Shastry-Sutherland lattice in the spin-12magnet CdCu2(BO3)
Janson
¹
,
Rousochatzakis
²
,
Tsirlin
³

et al. 2012
Phys. Rev. B