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Masuda, Takatsugu; Yano, D.; Kuroda, Ryo; Uchinokura, K.; Kuroe, Haruhiko; Sekine, Tomoyuki; Katsuki, Yuya; Ohwada, Kenji; Fujii, Yasuhiko; Nakao, Hironori; Murakami, Youichi

doi:10.1103/physrevb.67.024423

Cited by 7 publications

(5 citation statements)

References 32 publications

(40 reference statements)

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“…The strength of the second-neighbor bonds can also be controlled by applying pressure to such systems. Masuda and co-workers 22 studied the effect of pressure on highly Mg-doped CuGeO 3 and found that the frustration is enhanced as the pressure is increased. Another example of material that exhibits nontrivial second-neighbor interaction is Cu 6 Ge 6 O 18Ϫx H 2 O studied by Hase and co-workers.…”

Section: Introductionmentioning

confidence: 99%

Random antiferromagnetic spin-12chains with competing interactions

Yusuf¹,

Yang²

2003

Phys. Rev. B

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We study disordered antiferromagnetic spin-1 2 chains with nearest-and further-neighbor interactions using the real-space renormalization-group method. We find that the system supports two different phases, depending on the ratio of the strength between nearest-neighbor and further-neighbor interactions as well the bond randomness strength. For weak further-neighbor coupling the system is in the familiar random singlet phase, while stronger further-neighbor coupling drives the system to a large spin phase similar to that found in the study of random antiferromagnetic-ferromagnetic spin chains. The appearance of the large spin phase in the absence of ferromagnetic coupling is due to the frustration introduced by further-neighboring couplings, and is unique to the disordered chains.

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Section: Introductionmentioning

confidence: 99%

Random antiferromagnetic spin-12chains with competing interactions

Yusuf¹,

Yang²

2003

Phys. Rev. B

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“…12) This paper is concerned with the pressure-induced magnetic ordering in the spin gap system TlCuCl 3 .…”

Section: -7)mentioning

confidence: 99%

Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl₃

et al. 2003

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Neutron elastic scattering measurements have been performed under a hydrostatic pressure in order to investigate the spin structure of the pressure-induced magnetic ordering in the spin gap system TlCuCl 3 . Below the ordering temperature T N ¼ 16:9 K for the hydrostatic pressure P ¼ 1:48 GPa, magnetic Bragg reflections were observed at reciprocal lattice points Q ¼ ðh; 0; lÞ with integer h and odd l, which are equivalent to those points with the lowest magnetic excitation energy at ambient pressure. This indicates that the spin gap closes due to the applied pressure. The spin structure of the pressure-induced magnetic ordered state for P ¼ 1:48 GPa was determined.KEYWORDS: TlCuCl 3 , spin gap, pressure-induced magnetic ordering, spin structure, neutron elastic scattering DOI: 10.1143/JPSJ.72.1026The spin gap system is a magnetic system having the singlet spin liquid ground state with a finite excitation gap. 1)Recently, the magnetic ordering induced by modifying the gapped ground state by an external field or impurity doping has been energetically investigated. When a magnetic field, which is higher than the gap field H g corresponding to the energy gap Á ¼ g B H g , is applied in a spin gap system, the energy gap vanishes, and the system can undergo the magnetic ordering with the help of three-dimensional (3D) interactions. On the other hand, when nonmagnetic ions are substituted for magnetic ions in a spin gap system, the singlet ground state is disturbed, so that staggered moments are induced around the impurities. If the induced moments interact through effective exchange interactions, which are mediated by intermediate singlet spins, the 3D long-range order can arise. Such field-induced and impurity-induced magnetic orderings were observed in many spin gap systems. 2-7)The application of pressure is another method of controlling the quantum magnetism including the spin gap and the spin-Peierls transition. Some significant pressure effects have been observed in some quantum spin systems. The pressure-induced magnetic ordering was observed in Cu 2 (C 5 H 12 N 2 ) 2 Cl 4 , 8) which was first assumed to be an S ¼ 1=2 Heisenberg antiferromagnetic two-leg ladder 9) and was later characterized as a frustrated 3D spin gap system. 10) In Cu 2 (C 5 H 12 N 2 ) 2 Cl 4 , some of the singlet spin pairs are broken by the applied pressure to become paramagnetic spins, and the magnetic ordering similar to the impurity-induced antiferromagnetic ordering occurs in the rest of the spins. 8)The spin gap remains even in the ordered state.In a well-known inorganic spin-Peierls (SP) material CuGeO 3 , the SP phase was enhanced by the applied pressure, 11) so that the revival of the SP phase was observed for highly Mg-doped CuGeO 3 , in which the SP transition does not occur and the impurity-induced antiferromagnetic ordering only occurs at the low temperature for ambient pressure. 12)This paper is concerned with the pressure-induced magnetic ordering in the spin gap system TlCuCl 3 .We summarize the physical properties of TlCuCl ...

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“…For example, after the observation of the SP transition in CuGeO 3 , 4 many works on this cuprate and the SP transition have been carried out. [5][6][7][8][9][10][11][12][13][14][15][16][17] This leads to further understanding of the SP system and quantum spin systems.…”

Section: Introductionmentioning

confidence: 97%

“…It is known that there exist nearest-neighbor and next-nearest-neighbor AF interactions in spin chains in the SP CuGeO 3 , 9,10 and there are reports that the value of ␣ in CuGeO 3 is larger than ␣ c . 10,15,17 However, since the SP transition occurs at low temperatures, the spin gap in CuGeO 3 is not caused solely by the competing AF interactions.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties ofCu6Ge6O18

2003

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We studied magnetic properties of powder samples of Cu 6 Ge 6 O 18 -xH 2 O (xϭ0 -6). Susceptibility above the antiferromagnetic ͑AF͒ transition temperature (T N ) agrees with susceptibility obtained from the onedimensional Heisenberg Sϭ1/2 model with competing AF interactions. Since the estimated ratio ͑0.27-0.31͒ between nearest-neighbor and next-nearest-neighbor AF exchange interactions is close to a critical value ͑0.24 -0.30͒ which determines whether a spin gap exists or not, the spin system in Cu 6 Ge 6 O 18 -xH 2 O is probably located near a boundary between spin systems with gapless and gapped magnetic excitation. The value of T N /T max , where T max is the temperature at which the susceptibility is maximum, shows a unique dependence on x. We speculate that a spin gap due to competing AF interactions exists at xϽ1.54 and that magnetic excitation is gapless at xϾ1.54, explaining qualitatively the dependence of T N /T max on x.

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Appearance of the spin-Peierls phase under pressure inCu1−xMgxGeO<

Cited by 7 publications

References 32 publications

Random antiferromagnetic spin-12chains with competing interactions

Random antiferromagnetic spin-12chains with competing interactions

Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl₃

Magnetic properties ofCu6Ge6O18

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Appearance of the spin-Peierls phase under pressure inCu1−xMgxGeO<

Cited by 7 publications

References 32 publications

Random antiferromagnetic spin-12chains with competing interactions

Random antiferromagnetic spin-12chains with competing interactions

Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl3

Magnetic properties ofCu6Ge6O18

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Product

Resources

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Neutron Diffraction Study of the Pressure-Induced Magnetic Ordering in the Spin Gap System TlCuCl₃