Dynamics of a first-order electronic phase transition in manganites

Ward, Thomas Z.; Gai, Zheng; Guo, Hangwen; Yin, Lifeng; Shen, Jian

doi:10.1103/physrevb.83.125125

Cited by 34 publications

(27 citation statements)

References 40 publications

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“…For example, macroscopic magnetization cannot distinguish intra domain relaxation from phase switching [12]. Although the dynamics of PS state may be inferred from the transports through a manganite nanowire [13], but these measurements are limited to a narrow temperature range with sufficient conductivity. To date, the PS state with distinct physical properties has been visualized by various microscopy techniques such as scanning tunneling microscopy [14], electron microscopy [15], photoemission spectroscopy [16], magnetic force microscopy [17,18], and recently near-field microwave impedance microscopy (MIM) [19].…”

Section: Page 2 Of 12mentioning

confidence: 99%

Direct Imaging of Dynamic Glassy Behavior in a Strained Manganite Film

et al. 2015

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Complex many-body interaction in perovskite manganites gives rise to a strong competition between ferromagnetic metallic and charge ordered phases with nanoscale electronic inhomogeneity and glassy behaviors. Investigating this glassy state requires high resolution imaging techniques with sufficient sensitivity and stability. Here, we present the results of a near-field microwave microscope imaging on the strain driven glassy state in a manganite film. The high contrast between the two electrically distinct phases allows direct visualization of the phase separation. The low temperature microscopic configurations differ upon cooling with different thermal histories. At sufficiently high temperatures, we observe switching between the two phases in either direction. The dynamic switching, however, stops below the glass transition temperature. Compared with the magnetization data, the phase separation was microscopically frozen, while spin relaxation was found in a short period of time.

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Section: Page 2 Of 12mentioning

confidence: 99%

Direct Imaging of Dynamic Glassy Behavior in a Strained Manganite Film

et al. 2015

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“…Compared to the 500 lm strip, the q $ T cooling curve of the 1.5 lm strip is more noisy because there are fewer conducting channels and the signal of the phase transitions and fluctuations of the individual EPS domains is more pronounced. 16,18 Moreover, the q $ T cooling curve of the 1.5 lm strip shows a more pronounced shoulder at around 110 K, which corresponds to a second MIT based on our previous results. 17 Interestingly, as shown in Fig.…”

Section: Unusual Giant Anisotropic Magnetoresistance In Manganite Stripsmentioning

confidence: 86%

“…[16][17][18] Here, we investigate the GAMR behavior in manganite strips fabricated from epitaxial thin films. While the GAMR of the parent thin films has one single broad peak in the cooling process, the GAMR of the manganite strips show a remarkable double peak behavior.…”

Section: Unusual Giant Anisotropic Magnetoresistance In Manganite Stripsmentioning

confidence: 99%

Unusual giant anisotropic magnetoresistance in manganite strips

Chen

Wei

Zhang

et al. 2014

Applied Physics Letters

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Manganites have been known to exhibit giant anisotropic magnetoresistance (GAMR) near metal-insulator transition temperatures. Interestingly, we observed a second GAMR peak at lower temperatures in manganite strips fabricated from epitaxial thin films. The second low-temperature GAMR peak is highly sensitive to magnetic field and vanishes quickly upon increasing of magnetic field. We attribute the emergent GAMR behavior to spatial confinement effect on electronic phase separation in manganite strips.

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“…For the 500-nm disk array, however, no thermal hysteresis can be observed. This observation implies that the EPS state may no longer exist in the system (7,26).…”

Section: Significancementioning

confidence: 99%

Emerging single-phase state in small manganite nanodisks

Shao

Líu

Zhang

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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In complex oxides systems such as manganites, electronic phase separation (EPS), a consequence of strong electronic correlations, dictates the exotic electrical and magnetic properties of these materials. A fundamental yet unresolved issue is how EPS responds to spatial confinement; will EPS just scale with size of an object, or will the one of the phases be pinned? Understanding this behavior is critical for future oxides electronics and spintronics because scaling down of the system is unavoidable for these applications. In this work, we use La 0.325 Pr 0.3 Ca 0.375 MnO 3 (LPCMO) single crystalline disks to study the effect of spatial confinement on EPS. The EPS state featuring coexistence of ferromagnetic metallic and charge order insulating phases appears to be the low-temperature ground state in bulk, thin films, and large disks, a previously unidentified ground state (i.e., a single ferromagnetic phase state emerges in smaller disks). The critical size is between 500 nm and 800 nm, which is similar to the characteristic length scale of EPS in the LPCMO system. The ability to create a pure ferromagnetic phase in manganite nanodisks is highly desirable for spintronic applications.manganites | electronic phase separation | magnetization | single phase O wing to strong coupling between spin, charge, orbital, and lattice (1, 2), different electronic phases often coexist spatially in strongly correlated materials known as electronic phase separation (EPS) (3, 4). For colossal magnetoresistance (CMR) manganites, EPS has been observed to have strong influence on the global magnetic and transport properties (5, 6). Regarding the physical origin of EPS, it has been shown theoretically that quenched disorder can lead to inhomogeneous states in manganites (1, 3, 7). Once long-range effects such as coulombic forces (8), cooperative oxygen octahedral distortions (9), or strain effects (10) are included, calculations show infinitesimal disorder (8, 11) or even no explicit disorder (10) may lead to EPS. Within a phenomenological Ginzburg-Landau theory, it has been shown that EPS is intrinsic in complex systems as a thermodynamic equilibrium state (12).Although the details of the origin of the EPS remain as a matter of dispute, its very existence as a new form of electronic state has been well accepted. The length scale of the EPS has been observed to vary widely from nanometers to micrometers depending on many parameters that can affect the competition between different electronic phases (13)(14)(15)(16)(17)(18)(19)(20). It is thus of great interest to examine whether the EPS state still exists as the system is scaled down, especially when the spatial dimension of the system is smaller than the length scale of the EPS domains.In this work, we use La 0.325 Pr 0.3 Ca 0.375 MnO 3 (LPCMO) as a prototype system to show a spatial confinement-induced transition from the EPS state to a single ferromagnetic phase state. The LPCMO system is chosen because of its well-known large length scale of EPS domains (approximately a micromet...

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Dynamics of a first-order electronic phase transition in manganites

Cited by 34 publications

References 40 publications

Direct Imaging of Dynamic Glassy Behavior in a Strained Manganite Film

Direct Imaging of Dynamic Glassy Behavior in a Strained Manganite Film

Unusual giant anisotropic magnetoresistance in manganite strips

Emerging single-phase state in small manganite nanodisks

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