Study of Raman active phonons in NdMnO3

Jandl, S.; Barilo, S. N.; Shiryaev, S. V.; Mukhin, A. A.; Ivanov, V. Yu.; Balbashov, A. M.

doi:10.1016/s0304-8853(03)00133-1

Cited by 24 publications

(22 citation statements)

References 17 publications

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“…This indicates the overall persistence of coherent Jahn-Teller distortions at low Ca doping. Phonon intensities are strongly reinforced below T N = 75 K in NdMnO 3 [17] (Fig. 2).…”

Section: Methodsmentioning

confidence: 90%

“…The canted antiferromagnetic layered structure, at T N ~ 80 K, corresponds to a ferromagnetic exchange in the MnO 2 planes and an antiferromagnetic exchange between them [15,16]. A recent study of Raman active phonons in NdMnO 3 [17] has indicated that the phonon frequencies, intensities, and bandwidths are sensitive to the magnetic evolution of the Mn 3+ sublattice as a function of temperature. In particular, similarly to orthorhombic LaMnO 3 , the NdMnO 3 structure is distorted by a static JahnTeller effect consistent with the D 16 2h space group and the most intense ~ 601 cm -1 Raman active B 2g phonon softens below T N ~ 80 K following the paramagnetic to canted-antiferromagnetic phase transition.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Micro-Raman and magnetization studies of Nd_1-xCa_xMnO₃phase transitions

Jandl

Mukhin

Ivanov

et al. 2007

J. Phys.: Conf. Ser.

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Abstract. We present a micro-Raman study associated with magnetization measurements of high quality Nd 1-x Ca x MnO 3 single crystals, grown by the floating zone technique, in the temperature range from 4.2 to 300K for x = 0, 0.025, 0.05, and 0.1. Similarly to LaMnO3, the orthorhombic crystalline structures are distorted by a static Jahn-Teller effect consistent with the Pbnm space group. Influence of phase separation in ferromagnetic and A-type antiferromagnetic domains in the low doping regime is retraced by monitoring the Raman active phonon frequencies as a function of temperature and composition. The most intense B 2g mode softens for x = 0, 0.025, 0.05 compounds below T N ~80K, following the paramagnetic to canted-antiferromagnetic phase transition. While the magnetization measurements indicate for x = 0.1 compound an overall antiferromagnetic transition, its Raman B 2g mode does not soften below T N pointing to a disruption of long range antiferromagnetism.

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“…This indicates the overall persistence of coherent Jahn-Teller distortions at low Ca doping. Phonon intensities are strongly reinforced below T N = 75 K in NdMnO 3 [17] (Fig. 2).…”

Section: Methodsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Micro-Raman and magnetization studies of Nd_1-xCa_xMnO₃phase transitions

Jandl

Mukhin

Ivanov

et al. 2007

J. Phys.: Conf. Ser.

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show abstract

“…Recently Lorenz et al [1] found a remarkable increase (up to 60 %) of the dielectric constant with the onset of the magnetic order of 42 K in the metastable orthorhombic structures of YMnO 3 and HoMnO 3 that proves the existence of strong magneto-electric coupling in the compounds. It has been shown that magnetic ordering in LaMnO 3 [2][3][4] and NdMnO 3 [5] results in softening of a Raman active mode near 910 cm -1 , involving mainly in-plane stretching oxygen vibrations. This softening has been discussed by Granado et al [3] in terms of spin-phonon coupling caused by phonon modulation of the superexchange integral.…”

Section: Introductionmentioning

confidence: 99%

Study of J-T effect on the self-energy of electrons in manganite systems

Parhi¹,

Rout

Behera

2010

Indian J Phys

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We present here a theoretical study of the effect of Jahn-Teller(J-T) distortion on the self-energy of electrons in the CMR manganites. The model consists of the itinerant e g electrons distorted by J-T effect and the localized t 2 g core electrons carrying strong ferromagnetism due to Hund's rule. The phonon interacts with the e g electrons as well as the J-T distorted e g band. The electron Green's functions are calculated by Zubarev's technique. The electron self-energy which carries all the information of the model is calculated from the Green's function. The effect of J-T distortion, magnetism on the frequency and temperature dependent dynamic selfenergy is presented in this paper. The results are discussed.

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“…Its A-type structure is related to a layered structure with MnO 2 in-plane ferromagnetic interaction and MnO 2 inter-plane antiferromagnetic interaction [15,16]. Raman active phonons of Nd 1Àx Ca x MnO 3 [17,18] are sensitive to the magnetic evolution of the Mn 3+ sublattice as a function of temperature. In particular, for x ¼ 0, 0.025 and 0.05, the most intense $607 cm À1 Raman active B 2g phonon softens below T N $80 K, following the paramagnetic to canted antiferromagnetic phase transition.…”

Section: Introductionmentioning

confidence: 99%