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Shimomura, S.; Tonegawa, Takashi; Tajima, Kazuo; Wakabayashi, N.; Ikeda, Naoshi; Shobu, Takahisa; Noda, Yukio; Tomioka, Y.; Tokura, Y.

doi:10.1103/physrevb.62.3875

Cited by 38 publications

(30 citation statements)

References 17 publications

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“…Γ continues to follow T 2 dependence above T CO/OO as shown in Fig. 7 46 exists even above T CO/OO by neutron and x-ray scattering experiments, respectively. As in the case of the CDW system such as K0.3Mo1−zWzO3 and (TaSe4)2I, the collective excitation modes are also observed above the CDW transition temperature TCDW due to the presence of the fluctuating CDW segments, which are systematically investigated by Schwartz et al 47 For example, the collective excitation mode of K0.3MoO3 is visible even at 300 K (TCDW ∼ 183 K).…”

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confidence: 60%

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3
Kida
¹
,
Tonouchi
²

2002
Phys. Rev. B
83
5
38
0
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THz time-domain spectroscopy was used to directly probe the low-energy (0.5-5 meV) electrodynamics of the charge-ordered manganite Pr0.7Ca0.3MnO3. We revealed the existence of a finite peak structure around 2-3 meV well below the charge gap ∼ 300 meV. In analogy to the low-energy optical properties of the well-studied low-dimensional materials, we attributed this observed structure to the collective excitation mode arising from the charge-density-wave condensate. This finding provides the importance role of the quasi-one dimensional nature of the charge and orbital ordering in Pr0.7Ca0.3MnO3.

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confidence: 60%

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3
Kida
¹
,
Tonouchi
²

2002
Phys. Rev. B
83
5
38
0
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“…Recent x-ray diffuse and Raman scattering measurements [12,18,19,20,21] and optical conductivity experiments [22] have revealed that the CO/OO correlations gradually vanish with increasing temperature. Therefore, towards larger bandwidth, where T C is remarkably enhanced, the phase fluctuations at the paramagnetic side of the transition become less relevant.…”

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confidence: 99%

Multicritical End Point of the First-Order Ferromagnetic Transition in Colossal Magnetoresistive Manganites

et al. 2008

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We have studied the bandwidth-temperature-magnetic field phase diagram of RE0.55Sr0.45MnO3 colossal magnetoresistance manganites with ferromagnetic metallic (FM) ground state. The bandwidth (or equivalently the double exchange interaction) was controlled both via chemical substitution and hydrostatic pressure with a focus on the vicinity of the critical pressure p * where the character of the zero-field FM transition changes from first to second order. Below p * the first-order FM transition extends up to a critical magnetic field, Hcr. It is suppressed by pressure and approaches zero on the larger bandwidth side where the surface of the first-order FM phase boundary is terminated by a multicritical end-point (p * ≈32 kbar, T * ≈188 K, H * =0). The change in the character of the transition and the decrease of the CMR effect is attributed to the reduced CO/OO fluctuations. PACS numbers:Perovskite-type manganites exhibit various fundamental phenomena of current interest including colossal magnetoresistance (CMR), photo-and current-induced insulator to metal transition, first-order ferromagnetic transition and gigantic magneto-electric effect [1]. Most of them are collective effects arising from the strong interplay among the electronic degrees of freedom in the spin, charge and orbital sector which are further coupled to the underlying lattice. One of the most dramatic phase transformations induced by external stimuli is the magnetic field driven paramagnetic insulator (PI) to FM transition. It is observed in a broad range above the Curie temperature and the huge resistivity change associated with the transition is termed as colossal magnetoresistance. In the context of the CMR effect and the orbital order-disorder transition in manganites, the possibility that the first-order nature of phase transitions in three dimensional systems can be preserved in the presence of disorder has recently attracted much interest [2].Although the detailed mechanism of the CMR effect is still under debate, some of the basic ingredients have already been clarified. Among them the phase competition between the two robust neighboring states, i.e. the charge-and orbital-ordered insulator (CO/OO) and the ferromagnetic metal, is thought to be indispensable [1,3]. In the bandwidth-temperature (w − T ) phase diagram of CMR mangnites with low quenched disorder, these two phases are separated by a first-order phase boundary which can extend to as high temperature as T ≈ 200 K (see Fig. 1). It is terminated by a bicritical point where the CO/OO and FM transition line (T CO (w) and T C (w), respectively) meet each other. The temperature-induced transition from the high-temperature PI phase to the long-range ordered states on the both sides close to the bicritical point is of first order [4,5,6]. If quenched disorder is introduced to the lattice by alloying rare earth (RE) and alkali earth (AE) atoms on the A-sites with different ionic radius, the phase diagram is strongly modified; the bicritical point is suppressed and a spin-glass state appe...

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“…Temperature dependence of in a related compoundPr 0:5 Ca 0:5 MnO 3 can be obtained from Fig. 2(c) of [20]. It is 100…”

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confidence: 99%

Colossal Magnetoresistance in Manganites as a Multicritical Phenomenon

Murakami

Nagaosa

2003

Phys. Rev. Lett.

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The colossal magnetoresistance in manganites AMnO3 is studied from the viewpoint of multicritical phenomena. To understand the complicated interplay of various phases, we study the Ginzburg-Landau theory in terms of both the mean-field approximation and the renormalization-group analysis for comparison with the observed phase diagram. Several novel features, such as the first-order ferromagnetic transition and the dip in the transition temperature near the multicritical point, can be understood as being driven by enhanced fluctuations near the multicritical point. Furthermore, we obtain a universal scaling relation for the H/M versus M2 plot (Arrott plot), which fits rather well with the experimental data, providing further evidence for the enhanced fluctuation.

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X-ray diffuse scattering study on charge-localized states ofPr1−xCax
S. Shimomura
¹
,
Takashi Tonegawa
²
,
Kazuo Tajima
³

et al.

Cited by 38 publications

References 17 publications

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3
Kida
¹
,
Tonouchi
²

2002
Phys. Rev. B
83
5
38
0
View full text Add to dashboard Cite

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3
Kida
¹
,
Tonouchi
²

2002
Phys. Rev. B
83
5
38
0
View full text Add to dashboard Cite

Multicritical End Point of the First-Order Ferromagnetic Transition in Colossal Magnetoresistive Manganites

Colossal Magnetoresistance in Manganites as a Multicritical Phenomenon

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X-ray diffuse scattering study on charge-localized states ofPr1−xCaxS. Shimomura1, Takashi Tonegawa2, Kazuo Tajima3 et al.

Cited by 38 publications

References 17 publications

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3Kida1, Tonouchi2 2002Phys. Rev. B835380View full textAdd to dashboardCite

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3Kida1, Tonouchi2 2002Phys. Rev. B835380View full textAdd to dashboardCite

Multicritical End Point of the First-Order Ferromagnetic Transition in Colossal Magnetoresistive Manganites

Colossal Magnetoresistance in Manganites as a Multicritical Phenomenon

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Product

Resources

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X-ray diffuse scattering study on charge-localized states ofPr1−xCax
S. Shimomura
¹
,
Takashi Tonegawa
²
,
Kazuo Tajima
³

et al.

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3
Kida
¹
,
Tonouchi
²

2002
Phys. Rev. B
83
5
38
0
View full text Add to dashboard Cite

Spectroscopic evidence for a charge-density-wave condensate in a charge-ordered manganite: Observation of a collective excitation mode inPr0.7Ca0.3
Kida
¹
,
Tonouchi
²

2002
Phys. Rev. B
83
5
38
0
View full text Add to dashboard Cite