Structural Study of the Quantum-Spin Chain Compound (VO)2P2O7

Hiroi, Zenji; Azuma, Masaki; Fujishiro, Yoshinobu; Saito, Takashi; Takano, Mikio; Izumi, Fujio; Kamiyama, Takashi; Ikeda, Takuji

doi:10.1006/jssc.1999.8364

Cited by 42 publications

(67 citation statements)

References 21 publications

(27 reference statements)

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“…10. Subsequent χ(T ) data for powder 13 21) found from inelastic neutron scattering measurements on powder samples are both significantly larger than the one-magnon spin gap of 36.2(3) K determined from the neutron scattering measurements on single crystals.…”

Section: A Ap-(vo)2p2o7mentioning

confidence: 75%

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Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2
Johnston
¹
,
Saito
²
,
Azuma
³

et al. 2001
Phys. Rev. B
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The magnetic susceptibilities χ versus temperature T of powders and single crystals of the ambient-pressure (AP) and high-pressure (HP) phases of (VO)2P2O7 are analyzed using an accurate theoretical prediction of χ(T, J1, J2) for the spin-1/2 antiferromagnetic alternating-exchange (J1, J2) Heisenberg chain. The results are consistent with recent models with two distinct types of alternating-exchange chains in the AP phase and a single type in the HP phase. The spin gap for each type of chain is derived from the respective set of two fitted alternating exchange constants and the one-magnon dispersion relation for each of the two types of chains in the AP phase is predicted. The influences of interchain coupling on the derived intrachain exchange constants, spin gaps, and dispersion relations are estimated using a mean-field approximation for the interchain coupling. The accuracies of the spin gaps obtained using fits to the low-T χ(T ) data by theoretical low-T approximations are determined. The results of these studies are compared with previously reported estimates of the exchange couplings and spin gaps in the AP and HP phases and with the magnon dispersion relations in the AP phase measured previously using inelastic neutron scattering.

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Section: A Ap-(vo)2p2o7mentioning

confidence: 75%

“…13,30 The similarities between the two structures suggest that HP-(VO) 2 P 2 O 7 also contains S = 1/2 AF alternating-exchange chains, but of a single type. 30 Indeed, high-field M (H) measurements at 1.3 K revealed a single spin gap of ∼ 23 K, consistent with this hypothesis.…”

Section: B Hp-(vo)2p2o7mentioning

confidence: 97%

Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2
Johnston
¹
,
Saito
²
,
Azuma
³

et al. 2001
Phys. Rev. B
Self Cite
38
4
57
3
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“…AP-VOPO is made of VO pyramids and PO tetrahedra, and the vanadium ions are in an oxidation state of 4# with spin (10,11). Johnston et al found that the magnetic ground state is a singlet one and explained the temperature dependence of the magnetic susceptibility using a S"…”

Section: Introductionmentioning

confidence: 98%

Single Crystal Growth of the High Pressure Phase of (VO)2P2O7 at 3 GPa

Saito

Terashima

Azuma

et al. 2000

Journal of Solid State Chemistry

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“…Interestingly, the data also revealed the existence of a second energy gap of about twice as large as the first one as predicted theoretically [5]. However, this compound comprises two slightly different chains [6,7], making it difficult to determine whether these chains have single but different spin gaps or have the same double gaps. High-field magnetization and NMR studies have shown the former is the case [8].…”

mentioning

confidence: 63%

“…Because of this structural similarity to the AP phase, the HP phase was also expected to be a gapped alternating AF system. Note that the HP phase has only one V4+ site while the AP phase with multiple sites, four in the orthorhombic (Ρcα21) structure for a powdered sample [6] and eight in the monoclinic structure (Ρ2 1 ) for a single crystal [7]. Therefore, the HP phase comprises a unique kind of chain, in contrast with the ambient pressure phase containing two crystallographically different chains.…”

mentioning

confidence: 99%

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)₂P₂O_7-

et al. 2000

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The high-pressure phase of (VO) 2 P 2 O 7 comprises a unique kind of spain-1/2 Heisenberg alternating antiferromagnetic chain, in contrast with the ambient pressure phase containing two crystallographically different chains. Magnetic susceptibility and high-field magnetization data showed the presence of a single spin gap of 23 (magnetization) 27 (susceptibility) K, not double as observed for the ambient pressure phase. This result shows that the two kinds of chains of the ambient pressure phase have single, different spin gaps. . A recent neutron scattering study on single crystals [4] showed the validity of the alternating chain model with a major AF interaction (J1) between a pair of VO5 pyramids bridged by ΡO4 tetrahedra and a minor one (J2) between a pair of edge sharing VO5 pyramids. Interestingly, the data also revealed the existence of a second energy gap of about twice as large as the first one as predicted theoretically [5]. However, this compound comprises two slightly different chains [6,7], making it difficult to determine whether these chains have single but different spin gaps or have the same double gaps. High-field magnetization and NMR studies have shown the former is the case [8].We found that this compound undergoes a pressure-induced transition to a similar but simplified structure with a unique kind of chain [9]. The crystal structures of the high-pressure (HP) and the ambient-pressure (AP) phases are illustrated in Fig. 1. Both these are made of edge-sharing pairs of VO5 pyramids and PO4 tetrahedra, while the arrangement is simpler in the HP phase. In the (205) .

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Structural Study of the Quantum-Spin Chain Compound (VO)2P2O7

Cited by 42 publications

References 21 publications

Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2
Johnston
¹
,
Saito
²
,
Azuma
³

et al. 2001
Phys. Rev. B
Self Cite
38
4
57
3
View full text Add to dashboard Cite

Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2
Johnston
¹
,
Saito
²
,
Azuma
³

et al. 2001
Phys. Rev. B
Self Cite
38
4
57
3
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Single Crystal Growth of the High Pressure Phase of (VO)2P2O7 at 3 GPa

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)₂P₂O_7-

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Structural Study of the Quantum-Spin Chain Compound (VO)2P2O7

Cited by 42 publications

References 21 publications

Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2Johnston1, Saito2, Azuma3 et al. 2001Phys. Rev. BSelf Cite384573View full textAdd to dashboardCite

Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2Johnston1, Saito2, Azuma3 et al. 2001Phys. Rev. BSelf Cite384573View full textAdd to dashboardCite

Single Crystal Growth of the High Pressure Phase of (VO)2P2O7 at 3 GPa

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)2P2O7-

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Product

Resources

About

Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2
Johnston
¹
,
Saito
²
,
Azuma
³

et al. 2001
Phys. Rev. B
Self Cite
38
4
57
3
View full text Add to dashboard Cite

Modeling of the magnetic susceptibilities of the ambient- and high-pressure phases of(VO)2P2
Johnston
¹
,
Saito
²
,
Azuma
³

et al. 2001
Phys. Rev. B
Self Cite
38
4
57
3
View full text Add to dashboard Cite

New S=1/2 Alternating Chain Compound - High Pressure Form of (VO)₂P₂O_7-