Publisher's Note: Long-range Coulomb interactions and nanoscale electronic inhomogeneities in correlated oxides [Phys. Rev. B<b>80</b>, 125121 (2009)]

Shenoy, Vijay B.; Gupta, Tribikram; Krishnamurthy, H. R.; Ramakrishnan, T. V.

doi:10.1103/physrevb.80.169902

Phys. Rev. B

2009

DOI: 10.1103/physrevb.80.169902

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Publisher's Note: Long-range Coulomb interactions and nanoscale electronic inhomogeneities in correlated oxides [Phys. Rev. B80, 125121 (2009)]

Vijay B. Shenoy¹,

Tribikram Gupta²,

H. R. Krishnamurthy³

et al.

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Cited by 10 publications

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“…In the Mo pyrochlores, the competing phases under pressure are FM and PM, and therefore, we speculate that the intervening SGM state originate from the electronic PS found in our results. The glassy magnetic response is presumably explained by domain-like structure or a mixed state; for such situation, it is crucial to consider the effect of longranged Coulomb interaction as well as quenched randomness [20,21]. In the present case, the competing phases are both metallic, and hence, we expect that the resulting glassy state remains metallic.…”

mentioning

confidence: 78%

Electronic phase separation in the pyrochlore double-exchange model

Motome

Furukawa

2010

Phys. Rev. B

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Electronic phase separation and related inhomogeneity is ubiquitously seen in strongly-correlated systems. A typical example is found between ferromagnetic metal and antiferromagnetic insulator in CMR manganese oxides. Here we demonstrate that the geometrical frustration brings distinctive aspects into the phase separation phenomena. From Monte Carlo simulation and a simple energy comparison for the pyrochlore double-exchange model, we show that such phase separation takes place between ferromagnetic and paramagnetic metals. We discuss the relevance of our results to a spin-glassy metallic phase found in Mo pyrochlore oxides under external pressure.PACS numbers: 71.30.+h, 71.27.+a, 71.20.Be, 71.10.Fd Electronic inhomogeneity is one of the key concepts in strongly correlated electron systems. It emerges from keen competition between different electronic phases, and gives rise to fascinating phenomena, such as nanometerscale domain structure and gigantic response to external perturbations. Many intriguing topics related to the electronic inhomogeneity have been studied intensively, such as granular superconductivity in cuprates [1], colossal magneto-resistance (CMR) in manganites [2], and relaxor response in dielectric compounds [3].One of the most interesting, well-known examples is found in CMR manganites. It was argued that the competition between ferromagnetic metal (FM) and antiferromagnetic insulator (AFI) results in an electronicallyinhomogeneous state in the presence of quenched disorder, and that the inhomogeneous state is highly sensitive to external magnetic field and gives rise to the CMR effect [4]. Theoretically, the double-exchange (DE) model and its extensions have been extensively studied, and it was clarified that the model has an instability toward the electronic phase separation (PS) [2]. The PS occurs with a discontinuous change in the electron density, e.g., between FM and AFI: The former appears in a wide range of density by the DE ferromagnetic interaction of kinetic origin [5] and the latter is stabilized at a commensurate electron density by the AF super-exchange (SE) interaction [6,7]. The energetically-competing phases lead to the electronic PS as well as bicritical behaviors, which are discussed as key players in the fascinating properties of CMR manganites.In this Letter, we elucidate a new type of electronic PS in the DE model, which emerges when the lattice structure is geometrically frustrated. Here we show that PS takes place between FM and a paramagnetic state for the model defined on the pyrochlore lattice which has a threedimensional network of corner-sharing tetrahedra [inset of Fig. 1(a)]. The paramagnetic state does not have a charge gap, in contrast to the AFI state in the unfrustrated cases. While the PS was observed in the previous study [8], the present work elucidates its ubiquitousness and origin. It should be noted that this PS with a discontinuous change of the density is non-trivial, since the transition from ferromagnet to paramagnet is continuous in general. Th...

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confidence: 78%

Electronic phase separation in the pyrochlore double-exchange model

Motome

Furukawa

2010

Phys. Rev. B

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“…It has previously been suggested that strain parameter can tune the metal-insulator phase fraction in this LPCMO series of compounds [10]. Further, recently it is argued that the observed micro(meso) meter scale phase separation owes their existence to extrinsic causes like strain [11]. It is also remarked that "kinetic arrest" could be another possible reason for the observed micrometer scale phase separation in manganites.…”

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confidence: 90%

Effect of strain on the phase separation and devitrification of the magnetic glass state in thin films of La_{5/8 −y}Pr_yCa_3/8MnO₃(y= 0.45)

Sathe

Ahlawat

Rawat

et al. 2010

J. Phys.: Condens. Matter

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We present our study of effect of substrate induced strain on the La 5/8-y Pr y Ca 3/8 MnO 3 (y=0.45), thin films grown on LaAlO 3 , NdGaO 3 and SrTiO 3 susbtrates that show large scale phase separation. It is observed that unstrained films grown on NdGaO 3 behave quite similar to bulk material but the strained film grown on SrTiO 3 show melting of insulating phase to metallic phase at low temperatures. However, the large scale phase separation and metastable glass-like state is observed in all the films despite difference in substrate induced strain. The measurements of resistivity as a function of temperature under cooling and heating in unequal field (CHUF) protocol elucidates the presence of glass-like metastable phase generated due to kinetic arrest of first order transformation in all the films.Like structural glasses, these magnetic glass-like phase shows evidence of devitrification of the arrested charge order-antiferromagnetic insulator (CO-AFI) phase to equilibrium ferromagnetic metallic (FMM) phase with isothermal increase of magnetic field and/or isofield warming. These measurements also clearly brought out the equilibrium ground state of this system to be FMM and metastable glass-like phase to be AFI phase. PACS number(s): 75.30. Kz, 75.47.Lx, 75.60.Nt Introduction:

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“…The importance of interactions has also been stressed for DMS [8-10] and hexaborides [11]. The combination of disorder and electron-electron interactions may also play an important role in nanoscale electronic phase separation [12], which has been argued to be important for CMR in manganites [13]. It is hence important to develop accurate techniques that can account for the effects of electron-electron interactions in DE type models and to study their effects on magnetic properties of these models.Here we introduce a method to study the effects of electron-electron interactions in DE type models when the energy scale for interactions is in the experimentally relevant regime of no more than a few times the Hund coupling.…”

mentioning

confidence: 99%

“…The scheme we have introduced, and our demonstration that it should be accurate for the experimentally relevant interaction range U 3J, should be a further step towards the quantitative description of the magnetic properties of important DE type materials. It should also be possible to extend the scheme introduced here to treat both disorder (which has been included in previous non-interacting simulations [8,[18][19][20]) and longrange Coulomb interactions, which have been argued as being relevant to nanoscale phase separation and CMR [12].…”

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confidence: 99%

Enhanced ferromagnetism from electron-electron interactions in double-exchange-type models

Yazdani¹,

Kennett²

2011

Phys. Rev. B

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The magnetic properties of a variety of materials with promise for technological applications have been described by models in which fermions are coupled to local moment spins. Monte Carlo studies of such models usually ignore electron-electron interactions, even though the energy scale corresponding to these interactions may be comparable to or larger than other relevant energy scales. In this work we add on-site interactions between fermions to the double exchange model which we study with a Monte Carlo scheme in which temporal fluctuations of local moment spins are fully accounted for and electron-electron interactions are treated at a mean field level. We show that when the number of fermions is considerably less than the number of local moments even moderate interactions can lead to significant enhancement of ferromagnetism and the Curie temperature.The magnetic properties of a variety of materials of fundamental interest and technological promise, such as collosal magnetoresistance (CMR) manganites [1], rare earth hexaborides [2], and diluted, magnetic semiconductors (DMS) [3] have been described using double exchange (DE) type models in which fermions are coupled to local moment spins. In the limit that the number of fermions is considerably less than the number of local moments, such models generally display ferromagnetism [4].In manganites it is well established that electronelectron interactions are at least as large as the Hund coupling, and may be the largest energy scale in the problem [1,[5][6][7]. The importance of interactions has also been stressed for DMS [8-10] and hexaborides [11]. The combination of disorder and electron-electron interactions may also play an important role in nanoscale electronic phase separation [12], which has been argued to be important for CMR in manganites [13]. It is hence important to develop accurate techniques that can account for the effects of electron-electron interactions in DE type models and to study their effects on magnetic properties of these models.Here we introduce a method to study the effects of electron-electron interactions in DE type models when the energy scale for interactions is in the experimentally relevant regime of no more than a few times the Hund coupling. We use this method to show that even moderate interactions can enhance ferromagnetism and the Curie temperature T c significantly when the number of fermions is considerably less than the number of local moments.We combine a Hartree-Fock treatment of electronelectron interactions with a Monte Carlo scheme for fermions coupled to classical local moment spins. Through the use of exact diagonalizations on small systems we have determined regions of parameter space where this technique should be most accurate. We calculate the magnetization as a function of temperature for a variety of interaction strengths and determine the effects of interactions on the Curie temperature T c . Electronelectron interactions can lead to ferromagnetism in the absence of Hund coupling [14], so the enhancement in...

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Publisher's Note: Long-range Coulomb interactions and nanoscale electronic inhomogeneities in correlated oxides [Phys. Rev. B80, 125121 (2009)]

Cited by 10 publications

References 0 publications

Electronic phase separation in the pyrochlore double-exchange model

Electronic phase separation in the pyrochlore double-exchange model

Effect of strain on the phase separation and devitrification of the magnetic glass state in thin films of La_{5/8 −y}Pr_yCa_3/8MnO₃(y= 0.45)

Enhanced ferromagnetism from electron-electron interactions in double-exchange-type models

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Publisher's Note: Long-range Coulomb interactions and nanoscale electronic inhomogeneities in correlated oxides [Phys. Rev. B80, 125121 (2009)]

Cited by 10 publications

References 0 publications

Electronic phase separation in the pyrochlore double-exchange model

Electronic phase separation in the pyrochlore double-exchange model

Effect of strain on the phase separation and devitrification of the magnetic glass state in thin films of La5/8 −yPryCa3/8MnO3(y= 0.45)

Enhanced ferromagnetism from electron-electron interactions in double-exchange-type models

Contact Info

Product

Resources

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Effect of strain on the phase separation and devitrification of the magnetic glass state in thin films of La_{5/8 −y}Pr_yCa_3/8MnO₃(y= 0.45)