Author
Chan-Soo Jee
Other affiliations: Massachusetts Institute of Technology, Tufts University
Bio: Chan-Soo Jee is an academic researcher from Temple University. The author has contributed to research in topics: Antiferromagnetism & Magnetic susceptibility. The author has an hindex of 9, co-authored 14 publications receiving 666 citations. Previous affiliations of Chan-Soo Jee include Massachusetts Institute of Technology & Tufts University.
Papers
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TL;DR: The specific heat, the susceptibility, the magnetic ordering, and the metal-to-semiconductor transition seen in the resistivity are consistent with the picture that Y{sup 3+} is replaced by Pr{sup 4+} with some degree of valence admixture of the Pr-Ba-Cu-O configuration.
Abstract: An extensive study of magnetic, thermal, transport, and structural properties of the alloy Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} is presented. The endpoints of the alloy series are a high-temperature superconductor Y-Ba-Cu-O and an antiferromagnetic semiconductor (Pr-Ba-Cu-O, {ital T}{sub {ital N}}=17 K). The superconducting transition temperature is reduced with increasing Pr concentration following the Abrikosov-Gorkov pair-breaking curve with critical concentration {ital x}{sub cr}=0.62. Alloying also reduces the Neel temperature approximately linearly with the Y content, and there is a concentration region (0.4{lt}{ital x}{lt}0.6) where antiferromagnetism and superconductivity is suggested to coexist. The specific heat, the susceptibility, the magnetic ordering, and the metal-to-semiconductor transition seen in the resistivity are consistent with the picture that Y{sup 3+} is replaced by Pr{sup 4+} with some degree of valence admixture of the Pr{sup 3+} configuration.
274 citations
TL;DR: The small moment, along with the large value of the low-temperature electronic specific-heat coefficient {gamma} of 196 mJ/mol K{sup 2}, suggests that there is substantial {ital f}-electron character at the Fermi level.
Abstract: The magnetic order of Pr in nonsuperconducting PrBa{sub 2}Cu{sub 3}O{sub 7} has been studied by specific-heat, susceptibility, and neutron-diffraction measurements. The basic ordering consists of a simple antiferromagnetic arrangement, with a saturated moment of 0.24{mu}{sub {ital B}} and a Neel temperature {ital T}{sub {ital N}} of {similar to}17 K, which is two orders of magnitude higher than expected from either dipolar or Rudeman-Kittel-Kasuya-Yosida interactions alone. The small moment, along with the large value of the low-temperature electronic specific-heat coefficient {gamma} of 196 mJ/mol K{sup 2}, suggests that there is substantial {ital f}-electron character at the Fermi level.
144 citations
TL;DR: The specific heat, magnetization, susceptibility and electrical resistivity of Y1-xPrxBa2Cu3O7 are presented in this paper, where the authors show that Pr depresses Tc and causes a transition from metallic to semiconducting behavior at x ∼ 0.6.
67 citations
TL;DR: In this article, the magnetic unit cell is obtained from doubling the orthorhombic chemical unit cell along all three basis vectors; q/sub magnetic/ = ((1/2, 1) / 2,(1/ 2).
Abstract: Neutron diffraction measurements on the high-temperature superconductor DyBa/sub 2/Cu/sub 3/O/sub 7/ have revealed antiferromagnetic ordering of the Dy moments below 1 K. The magnetic unit cell is obtained from doubling the orthorhombic chemical unit cell along all three basis vectors; q/sub magnetic/ = ((1/2, 1) / 2 ,(1/2). Within experimental error, the moments are aligned along the c axis of the structure and the ordered moment is 7.2 +- 0.6..mu../sub B/, which is smaller than the full moment of 10..mu../sub B/.
51 citations
TL;DR: In this article, the experimental binding energies are between 1.0 and 1.4 eV further from the Fermi level than the calculation, and they suggest that this difference may affect attempts to predict tight-binding modeling of the electron-phonon mechanism.
Abstract: Valence-band photoemission measurements have been made both above and below the ${T}_{c}$ of ${\mathrm{Ba}}_{2}$${\mathrm{YaCu}}_{3}$${\mathrm{O}}_{9\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ where \ensuremath{\delta}=2.1. We find similarities to recent calculations of the electronic properties. However, the experimental binding energies are between 1.0 and 1.4 eV further from the Fermi level than the calculation. We suggest that this difference may affect attempts to predict ${T}_{c}$ from tight-binding modeling of the electron-phonon mechanism.
47 citations
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TL;DR: In this paper, the authors present a review of the state-of-the-art in the field of high-temperature superconductivity in transition-metal oxides, focusing on the low energy excitations, the topology of the Fermi surface in the normal state, and the superconducting gap.
362 citations
TL;DR: The properties of the Y1−xPrxBa2Cu3O7 (YPrBCO) system are reviewed in this paper, including superconducting, normal state, structural, chemical, optical, magnetic, and thermal properties.
Abstract: The properties of the Y1−xPrxBa2Cu3O7 (YPrBCO) system are reviewed. These include superconducting, normal state, structural, chemical, optical, magnetic, and thermal properties. The destruction of superconductivity with Pr doping is discussed in view of possible models such as hole filling, localization, magnetic pair-breaking, and the role of hybridization. Applications to electronic devices using YBCO/PrBCO/YBCO multilayers are also reviewed.
327 citations
TL;DR: In this article, a review of recent experimental and theoretical work on ordering and pattern formation in thin magnetic thin-film and quasi-two-dimensional systems is presented, where a wide range of magnetic structures are possible as a result of the competition between the long-ranged dipolar interactions and localized interactions.
Abstract: Thin films and quasi-two-dimensional systems show a wide range of ordering effects and related pattern-formation phenomena. The origins of these phenomena can often be traced to competition between the atomic (or molecular) interactions in the system and the resulting inherent frustration of the system. In magnetic thin films, a wide range of magnetic structures are possible as a result of the competition between the long-ranged dipolar interactions and localized interactions. This article reviews recent experimental and theoretical work which has developed our understanding of ordering and pattern formation in these films and in related structures.
223 citations
TL;DR: In this paper, Raman and IR-measurements on the high-T c material series La 2 CuO 4 and YBa 2 Cu 3 O 7 are reviewed, focusing on lattice vibrations in these superconducting systems, on impurity phases, the influence of oxygen stoichiometry and element substitution.
Abstract: Raman and IR-measurements on the high- T c material series La 2 CuO 4 and YBa 2 Cu 3 O 7 are reviewed. This summary focuses on lattice vibrations in these superconducting systems, on impurity phases, the influence of oxygen stoichiometry and element substitution. The determination of the superconducting gap, the phonon renormalization in the superconducting state, and the isotope effect with its implications on the theory of superconductivity in these materials are discussed. In addition, the measured lattice vibrations are compared with the results of lattice dynamics calculations.
185 citations
TL;DR: Improvements in energy resolution and detection efficiency of angle-resolved photoemission spectroscopy have made it possible to discover a number of fascinating features in the electronic structure of the high transition temperature (Tc) superconductors: apparently bandlike Fermi surfaces, flat-band saddle points, and nested Fermani surface sections.
Abstract: Over the last several years there have been great improvements in the energy resolution and detection efficiency of angle-resolved photoemission spectroscopy. These improvements have made it possible to discover a number of fascinating features in the electronic structure of the high transition temperature (T(c)) superconductors: apparently bandlike Fermi surfaces, flat-band saddle points, and nested Fermi surface sections. Recent work suggests that these features, previously thought explainable only by one-electron band theory, may be better understood with a many-body approach. Furthermore, other properties of the high-T(c) superconductors, which are difficult to understand with band theory, are well described using a many-body picture. Angle-resolved photoemission spectroscopy has also been used to investigate the nature of the superconducting pairing state, revealing an anisotropic gap consistent with a d-wave order parameter and fueling the current debate over s-wave versus d-wave superconductivity.
184 citations