Epitaxial-strain effect on charge/orbital order in Pr0.5Ca0.5MnO3 films

Okuyama, Daisuke; Nakamura, Masao; Wakabayashi, Yusuke; Itoh, Hirotake; Kumai, Reiji; Yamada, Hiroyuki; Taguchi, Y.; Arima, T.; Kawasaki, Masashi; Tokura, Y.

doi:10.1063/1.3246158

Cited by 46 publications

(44 citation statements)

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“…Near this bicritical point, the PCSMO crystal shows coexistence and competition of the two phases, which is sensitive to external stimuli 21 . In addition to this sample, the half-doped Pr 0.5 Ca 0.5 MnO 3 (PCMO) with very rigid charge-ordered (CO) state and the metallic La 0.65 Sr 0.35 MnO 3 (LSMO) have also been examined as the references 22 . With epitaxially grown manganite films (~40 nm in thickness) on n-type Nb-doped (0.01 wt%) SrTiO 3 substrates (Nb: STO), p-n junctions were built for PCMO and PCSMO samples, while a Schottky junction for metallic LSMO sample, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The LSMO and PCMO thin films were grown on Nb:STO (001) substrates. The LSMO (001) film with a small strain effect from the substrate shows a ferromagnetic metallic state in a whole measurement temperature range, whereas half doped PCMO (001) film is a rigid insulator with the CO state, which is stabilized by tensile strain from the substrate 22 . All these manganite films were grown by pulsed laser deposition.…”

Section: Methodsmentioning

confidence: 99%

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Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

et al. 2012

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Electronic phase separation is one of the key features in correlated electron oxides. The coexistence and competition of multiple phases give rise to gigantic responses to tiny stimuli producing dramatic changes in magnetic, transport and other properties of these compounds. To probe the physical properties of each phase separately is crucial for a comprehensive understanding of phase separation phenomena and for designing their device functions. Here we unravel, using a unique p-n junction configuration, dynamic properties of multiple phases in manganite thin films. The multiple dielectric relaxations have been detected and their corresponding multiple phases have been identified, while the activation energies of dielectric responses from different phases were extracted separately. Their phase evolutions with changing both temperature and applied magnetic field have been demonstrated by dielectric response. These results provide a guideline for exploring the electronic phase separation phenomena in correlated electron oxides.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

et al. 2012

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“…The impact of substrate induced structural/microstructural perturbations on the magnetic and magnetotransport properties have been investigated by several authors [20][21][22]. Here we would like to mention that the strain arising owing to the distinct lattice constants of the film material and the substrate is one of the key external stimuli and has profound impact on the size and fraction of the FMM and AFM/COI phases [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism, insulator-metal transition and magnetotransport in Pr_0.58Ca_0.42MnO₃films: role of microstructural perturbations

Agarwal

Siwach

Varma

et al. 2014

Mater. Res. Express

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Magnetic and magnetotransport properties of oriented polycrystalline Pr 0.58 Ca 0.42 MnO 3 thin films prepared in flowing oxygen and air ambient has been investigated. The magnetic ground state of both the films is a frozen cluster glass. In the air annealed film charge order (CO) is quenched and ferromagnetic (FM) transition, which appears at T C 148 K is followed by antiferromagnetic (AFM) transition at T N 104 K. This film shows self-field hysteretic As H increases to higher values the thermoresistive hysteresis is reduced, resistivity jumps are observed to disappear and T IM decreases. In the lower temperature regime (T=5 K and 40 K) the resistivity first decreases slowly with H and then shows sharp drop. The virgin cycle  is not recoverable in subsequent cycles. The  decrement far more pronounced in the oxygen annealed film and occurs at much higher H suggesting that the frozen cluster glass state is more robust in this film. At temperatures around T C , the -H hysteresis and the magnetic field induced drop in resistivity is more prominent in the oxygen annealed film. In the temperature regime dominated by CO (T C

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“…The 40-nm PCMO thin film was grown by pulsed laser deposition on a (011)-oriented ðLaAlO 3 Þ 0.3 ðSr 2 TaAlO 6 Þ 0.7 substrate, as described in [20], and has an ordering temperature T CO of 220 K, only slightly below the reported bulk critical temperature. During the experiment, the sample was kept at 100 K, well below T CO , by means of a nitrogen cryoblower.…”

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confidence: 99%

Nonlinear Electron-Phonon Coupling in Doped Manganites

et al. 2017

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We employ time-resolved resonant x-ray diffraction to study the melting of charge order and the associated insulator-to-metal transition in the doped manganite Pr 0.5 Ca 0.5 MnO 3 after resonant excitation of a high-frequency infrared-active lattice mode. We find that the charge order reduces promptly and highly nonlinearly as function of excitation fluence. Density-functional theory calculations suggest that direct anharmonic coupling between the excited lattice mode and the electronic structure drives these dynamics, highlighting a new avenue of nonlinear phonon control. DOI: 10.1103/PhysRevLett.118.247601 Some of the most fascinating phenomena in condensedmatter physics arise from electron-phonon interactions. A striking example is the BCS theory for superconductivity, where phonons mediate an attractive interaction between two electrons [1]. In metals and semiconductors, transport properties are also shaped by linear electron-phonon (e-ph) coupling, in particular through the creation of polarons [2]. Furthermore, e-ph coupling plays an important role in the physics of perovskite oxides such as the mixed-valence manganites, where a variety of electronic and magnetic phases is stabilized via the Jahn-Teller effect [3]. The precarious equilibrium between these possible ground states is easily perturbed by external stimuli such as static electric or magnetic fields, temperature, pressure, or even by light, opening new ways of manipulating matter on ever faster time scales with short laser pulses [4][5][6][7][8][9][10].The recent progress in the generation of high-energy ultrashort pulses in the midinfrared (mid-IR) range permits us to resonantly excite vibrational modes of the lattice to large amplitudes, exceeding several percent of the interatomic distances-a value at which nonlinear coupling of phonons to other degrees of freedom becomes important [11][12][13]. This approach enabled mode-selective material control on subpicosecond time scales, as exemplified in vibrationally induced superconductivity [8,12] and insulator-metal transitions [11], as well as lattice-driven suppression of magnetic and orbital order [14]. A proposed mechanism, referred to as "nonlinear phononics" and based on nonlinear phonon-phonon coupling, suggests that these phenomena result from the rectification of the excited mode and a net displacement of the crystal lattice along the coordinates of anharmonically coupled vibrational modes, which control the electronic properties [8,[14][15][16]. A possible direct coupling between the excited mode and the electronic system has only seldomly been considered [17], although, for example, the vibrational excitation of a molecular solid was shown to coherently perturb electronic interactions [18].In this Letter, we explore the nonlinear electron-phonon coupling in a manganite by investigating the lattice driven ultrafast insulator-metal transition [11]. We use resonant xray diffraction at the Mn K edge to study the dynamics of the electronic and structural order in a Pr 0.5 Ca 0.5 MnO 3 (PCM...

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Epitaxial-strain effect on charge/orbital order in Pr0.5Ca0.5MnO3 films

Cited by 46 publications

References 16 publications

Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

Ferromagnetism, insulator-metal transition and magnetotransport in Pr_0.58Ca_0.42MnO₃films: role of microstructural perturbations

Nonlinear Electron-Phonon Coupling in Doped Manganites

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Epitaxial-strain effect on charge/orbital order in Pr0.5Ca0.5MnO3 films

Cited by 46 publications

References 16 publications

Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

Ferromagnetism, insulator-metal transition and magnetotransport in Pr0.58Ca0.42MnO3films: role of microstructural perturbations

Nonlinear Electron-Phonon Coupling in Doped Manganites

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Ferromagnetism, insulator-metal transition and magnetotransport in Pr_0.58Ca_0.42MnO₃films: role of microstructural perturbations