Magnetic torque and heat capacity measurements on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>TPP</mml:mtext><mml:msub><mml:mrow><mml:mrow><mml:mo>[</mml:mo><mml:mrow><mml:mtext>Fe</mml:mtext><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>Pc</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>CN</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow></mml:mrow><mml:mn>2</mml:mn></mml:msub></m

Tajima, Hiroyuki; Yoshida, Gosuke; Matsuda, Masaki; Nara, Kazumi; Kajita, Kôji; Nishio, Y.; Hanasaki, N.; Naito, T.; Inabe, Tamotsu

doi:10.1103/physrevb.78.064424

Cited by 29 publications

(13 citation statements)

References 15 publications

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“…(3) The magnetic susceptibility shows a large anisotropy, χ ⊥ /χ > 5, and χ gives similar values with the Co-one 9 . (4) Residual magnetization is observed at T < 12K, which is attributed to the ferrimagnetism of π-electrons by the torque experiment 18 . (5) The MR is not scaled by the magnetization and shows large Tdependence 19 .…”

Section: Summary and Discussionmentioning

confidence: 99%

Interplay of strongly correlated electrons and localized Ising moments in one dimension

Hotta

2010

Phys. Rev. B

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We study the ground state properties of the one-dimensional quarter-filled strongly correlated electronic chain coupled by J to another chain of antiferromagnetic Ising moments. We focus on the case where the large Coulomb interactions localize the charges on every other site. Both the electronic spins and the Ising moments interact antiferromagnetically within each chain by J eff and J ′ , respectively. Since the number of electrons is half as that of the Ising moments the period of magnetic correlation of these two chains are incommensurate. In the presence of J, the frustration of J eff and J ′ arises, which may lead the system to the intriguing magneto-electric effect.

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Section: Summary and Discussionmentioning

confidence: 99%

Interplay of strongly correlated electrons and localized Ising moments in one dimension

Hotta

2010

Phys. Rev. B

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“…The numerical simulation based on the anisotropic Heisenberg model in one dimension was performed to explain the anomaly observed at 25 K for the susceptibility with B ⊥ c and the large anisotropy [16]. The results indicate that the anomaly at 25 K is due to antiferromagnetic short range order formation of the d electrons and that the π-electrons fall into an antiferromagnetic state at the lower temperatures.…”

Section: Tpp[fe(pc)(cn) 2 ] 2 Magnetic Conductormentioning

confidence: 99%

Axially Ligated Phthalocyanine Conductors with Magnetic Moments

Inabe

Hanasaki

2017

Magnetochemistry

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This mini-review describes electrical conductivity, magnetic properties, and magnetotransport properties of one-dimensional partially oxidized salts composed of axially ligated phthalocyanines, TPP[M(Pc)(CN) 2 ] 2 (TPP = tetraphenylphosphonium, Pc = phthalocyaninato), with M of Fe (d 5 , S = 1/2) and Cr (d 3 , S = 3/2). These salts are isomorphous, and π-π interactions in the crystal, that becomes the origin of the charge carriers, are nearly the same. Both the Fe and Cr salts show carrier localization and charge disproportionation which is enhanced by the interaction between local magnetic moments and conduction π-electrons (π-d interaction). However, the magnetic properties are slightly different between them. M = Fe has been found to show unique anisotropic magnetic properties and antiferromagnetic short-range magnetic order between the d-spins. On the other hand, for M = Cr, its magnetic moment is isotropic. Temperature dependence of the magnetic susceptibility shows typical Curie-Weiss behavior with negative Weiss temperature, but the exchange interaction is complicated. Both M = Fe and M = Cr show large negative magnetoresistance, reflecting the difference in the anisotropy. The magnetoresistance ratio (MR) is larger in the Fe system than in the Cr system in the low magnetic field range, but MR in the Cr system exceeds that in the Fe system when the magnetic field becomes higher than 15 T. We discuss the mechanism of the giant negative magnetoresistance with reference to the d-d, π-d, and π-π interactions.

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“…J H denotes the π-d interaction. We also include the AF super-exchange interaction, J K , between d spins, whose short-range correlation is experimentally indicated by the analysis of the magnetic susceptibilities [72]. We have elucidated that, at low-T range compared to J K , corresponding to a situation where the Ising spins are frozen antiferromagnetically, the π-d coupling, J H , considerably enhances the correlation of CO [71], consistent with the insulating character seen in the compound.…”

Section: Discussionmentioning

confidence: 80%

Theoretical Studies on Phase Transitions in Quasi-One-Dimensional Molecular Conductors

2012

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A review is given for recent theoretical studies on phase transitions in quasi-one-dimensional molecular conductors with a quarter-filled band. By lowering temperature, charge transfer salts exhibit a variety of transitions accompanying symmetry breaking, such as charge ordering, lattice dimerization, antiferromagnetic transition, spin-Peierls distortion, and so on. Analyses on microscopic quasi-one-dimensional models provide their systematic understandings, by the complementary use of different analytical and numerical techniques; they can reproduce finite-temperature phase transitions, whose results can be directly compared with experiments and give feedbacks to material design.

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Magnetic torque and heat capacity measurements onTPP[Fe(Pc)(CN)2

Cited by 29 publications

References 15 publications

Interplay of strongly correlated electrons and localized Ising moments in one dimension

Interplay of strongly correlated electrons and localized Ising moments in one dimension

Axially Ligated Phthalocyanine Conductors with Magnetic Moments

Theoretical Studies on Phase Transitions in Quasi-One-Dimensional Molecular Conductors

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