Bilayer splitting and<i>c</i>-axis coupling in bilayer manganites showing colossal magnetoresistance

Graf, J.; Bostwick, Aaron; Rotenberg, Eli; Zheng, Hong; Mitchell, J. F.; Lanzara, Alessandra

doi:10.1103/physrevb.80.235111

Cited by 8 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, high resolution experiments allowed resolving the coherent quasiparticle peaks and their renormalized dispersion at E F . 54,56 The ability to take this type of data efficiently allowed exploring a large phase space of temperature, momentum, and doping in our own study, 208 partly shown in Figure These results are quite promising and hint at the power of spin-resolved photoemission in addressing the physics in these materials. However they do not offer the level of data required to resolve the questions presented above.…”

Section: Cmr Manganitessupporting

confidence: 48%

A New Spin on Photoemission Spectroscopy

Jozwiak

2008

View full text Add to dashboard Cite

Professor Alessandra Lanzara, ChairThe electronic spin degree of freedom is of general fundamental importance to all matter.Understanding its complex roles and behavior in the solid state, particularly in highly correlated and magnetic materials, has grown increasingly desirable as technology demands advanced devices and materials based on ever stricter comprehension and control of the electron spin. However, direct and efficient spin dependent probes of electronic structure are currently lacking.Angle Resolved Photoemission Spectroscopy (ARPES) has become one of the most successful experimental tools for elucidating solid state electronic structures, bolstered by continual breakthroughs in efficient instrumentation. In contrast, spin-resolved photoemission spectroscopy has lagged behind due to a lack of similar instrumental advances. The power of photoemission spectroscopy and the pertinence of electronic spin in the current research climate combine to make breakthroughs in Spin and Angle Resolved Photoemission Spectroscopy (SARPES) a high priority .This thesis details the development of a unique instrument for efficient SARPES and represents a radical departure from conventional methods. A custom designed spin polarimeter based on low energy exchange scattering is developed, with projected efficiency gains of two orders of magnitude over current state-of-the-art polarimeters. For energy analysis, the 1 popular hemispherical analyzer is eschewed for a custom Time-of-Flight (TOF) analyzer offering an additional order of magnitude gain in efficiency. The combined instrument signifies the breakthrough needed to perform the high resolution SARPES experiments necessary for untangling the complex spin-dependent electronic structures central to today's condensed matter physics.

show abstract

Section: Cmr Manganitessupporting

confidence: 48%

A New Spin on Photoemission Spectroscopy

Jozwiak

2008

View full text Add to dashboard Cite

show abstract

“…1(b). As revealed by many theoretical and experimental studies, the two hole pockets arise from bonding and antibonding bands of bi-layer splitting band structure in this material with hybridized d x 2 −y 2 and d 3z 2 −r 2 states of e g electrons, and the outer electron pocket consists mainly of d 3z 2 −r 2 e g states151718192021. However, the inner electron pocket has not yet been explicitly presented by ARPES investigations.…”

Section: Resultsmentioning

confidence: 89%

Minority-spin t2gstates and the degree of spin polarization in ferromagnetic metallic La2−2xSr1+2xMn2O7 (x = 0.38)

Sun

Wang

Douglas

et al. 2013

Sci Rep

Self Cite

View full text Add to dashboard Cite

A half-metal is a material with conductive electrons of one spin orientation. This type of substance has been extensively searched for due to the fascinating physics as well as the potential applications for spintronics. Ferromagnetic manganites are considered to be good candidates, though there is no conclusive evidence for this notion. Here we show that the ferromagnet La2−2xSr1+2xMn2O7 (x = 0.38) possesses minority-spin states, challenging whether any of the manganites may be true half-metals. However, when electron transport properties are taken into account on the basis of the electronic band structure, we found that the La2−2xSr1+2xMn2O7 (x = 0.38) can essentially behave like a complete half metal.

show abstract

“…This doping dependence is intriguing but potentially puzzling given such sensitivity. Still, work in other correlated electronic systems, such as the manganites, demonstrates that such a small doping change does cause a qualitative change in the electronic structure [44]. Thus, the IE has a strong sensitivity to optimal doping and, therefore, there exists a rapid change in the electron-lattice interaction near optimal doping.…”

Section: Isotope Effect In Arpes Width Of Bi2212mentioning

confidence: 99%

Through a Lattice Darkly: Shedding Light on Electron-Phonon Coupling in the HighTcCuprates

Garcia

Lanzara

2010

Advances in Condensed Matter Physics

Self Cite

View full text Add to dashboard Cite

With its central role in conventional BCS superconductivity, electron-phonon coupling appears to play a more subtle role in the phase diagram of the high-temperature superconducting cuprates. Their added complexity due to potentially numerous competing phases, including charge, spin, orbital, and lattice ordering, makes teasing out any unique phenomena challenging. In this review, we present our work using angle-resolved photoemission spectroscopy (ARPES) exploring the role of the lattice on the valence band electronic structure of the cuprates. We introduce the ARPES technique and its unique ability to the probe the effect of bosonic renormalization (or “kink”) on near-EFband structure. Our survey begins with the establishment of the ubiquitous nodal cuprate kink leading to how isotope substitution has shed a critical new perspective on the role and strength of electron-phonon coupling. We continue with recently published work connecting the phonon dispersion seen with inelastic X-ray scattering (IXS) to the location of the kink observed by ARPES near the nodal point. Finally, we present very recent and ongoing ARPES work examining how induced strain through chemical pressure provides a potentially promising avenue for understanding the broader role of the lattice to the superconducting phase and larger cuprate phase diagram.

show abstract

Bilayer splitting andc-axis coupling in bilayer manganites showing colossal magnetoresistance

Cited by 8 publications

References 42 publications

A New Spin on Photoemission Spectroscopy

A New Spin on Photoemission Spectroscopy

Minority-spin t2gstates and the degree of spin polarization in ferromagnetic metallic La2−2xSr1+2xMn2O7 (x = 0.38)

Through a Lattice Darkly: Shedding Light on Electron-Phonon Coupling in the HighTcCuprates

Contact Info

Product

Resources

About