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Title: Evidence of anisotropic phase correlations above T c in single crystalline Ba 0.54 K 0.46 Fe 2 As 2

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USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physica. B, Condensed Matter
Additional Journal Information:
Journal Volume: 512; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-14 03:30:01; Journal ID: ISSN 0921-4526
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Citation Formats

Paladhi, D., Sahoo, R. C., and Nath, T. K. Evidence of anisotropic phase correlations above T c in single crystalline Ba 0.54 K 0.46 Fe 2 As 2. Netherlands: N. p., 2017. Web. doi:10.1016/j.physb.2017.02.020.
Paladhi, D., Sahoo, R. C., & Nath, T. K. Evidence of anisotropic phase correlations above T c in single crystalline Ba 0.54 K 0.46 Fe 2 As 2. Netherlands. doi:10.1016/j.physb.2017.02.020.
Paladhi, D., Sahoo, R. C., and Nath, T. K. 2017. "Evidence of anisotropic phase correlations above T c in single crystalline Ba 0.54 K 0.46 Fe 2 As 2". Netherlands. doi:10.1016/j.physb.2017.02.020.
title = {Evidence of anisotropic phase correlations above T c in single crystalline Ba 0.54 K 0.46 Fe 2 As 2},
author = {Paladhi, D. and Sahoo, R. C. and Nath, T. K.},
abstractNote = {},
doi = {10.1016/j.physb.2017.02.020},
journal = {Physica. B, Condensed Matter},
number = C,
volume = 512,
place = {Netherlands},
year = 2017,
month = 5

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.physb.2017.02.020

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  • Optical properties of In{sub 0.46}Al{sub 0.54}As/Ga{sub 0.46}Al{sub 0.54}As quantum dots (QDs) have been investigated by photoluminescence (PL). At a low temperature of 8 K, the PL peak energy blue-shifts 44 meV and the linewidth broadens by 21 meV as the excitation intensity increases by four orders of magnitude. As the temperature increases, the QD spectra demonstrate a fast redshift and narrowing from ∼35 K. These observations have been explained by the type-II nature of QDs and the lateral carrier transfer due to electronic coupling between neighboring QDs. A special double exponential decay behavior indicates the coexistence of type-I and type-II band alignment in thismore » QD sample.« less
  • Single crystals of the KTiOPO{sub 4} (KTP) type phases K{sub 0.55}Li{sub 0.45}TiOPO{sub 4} and K{sub 0.54}Li{sub 0.46}TiOAsO{sub 4} have been prepared by molten salt ion-exchange reactions from their potassium-containing precursors. After ion-exchange both phases maintain the distinctive distorted TiO{sub 6} octahedra seen in KTiOPO{sub 4} and KTiOAsO{sub 4}. The pattern of lithium-ion substitution differs for these two phases: In K{sub 0.55}Li{sub 0.45}TiOPO{sub 4}, Li substitutes for both of the two crystallographically distinct potassium cations to roughly equal extent, whereas in K{sub 0.54}Li{sub 0.46}TiOAsO{sub 4}, the 9-coordinate K(2) atom is preferentially replaced by Li. The lithium cations occupy six-rings of TiO{submore » 6} and PO{sub 4} polyhedra and adopt approximate square-planar coordination in both these materials. Second harmonic generation at 1064 nm is not significantly affected by lithium substitution in either of these phases. Crystal data: K{sub 0.55}Li{sub 0.45}TiOPO{sub 4}: M{sub r} = 183.55, orthorhombic, space group Pna2{sub 1} (No. 33), a = 12.741(2) {angstrom}, b = 6.357(1) {angstrom}, c = 10.535(2) {angstrom}, V = 853(2) {angstrom}{sup 3}, Z = 8, R(F) = 3.31% for 1393 reflections with I > 3{sigma}(I). K{sub 0.54}Li{sub 0.46}TiOAsO{sub 4}: M{sub r} = 227.11, orthorhombic, space group Pna2{sub 1} (No. 33), a = 13.018(2) {angstrom}, b = 6.589(1) {angstrom}, c = 10.766(2) {angstrom}, V = 923(2) {angstrom}{sup 3}, Z = 8, R(F) = 3.76% for 1637 reflections [I > 3{sigma}(I)]. 31 refs., 6 figs., 7 tabs.« less
  • We have fabricated high-quality <00.1> textured Pb(Zr{sub 0.54} Ti{sub 0.46})O{sub 8} (PZT) thin films on (001)Si with interposing <001> textured YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} (YBCO) and yttria-stabilized zirconia (YSZ) buffer layers using pulsed laser deposition (KrF excimer laser, {lambda} = 248 nm, {tau} = 20 nanosecs). The YBCO layer provides a seed for PZT growth and can also act as an electrode for the PZT films, whereas YSZ provides a diffusion barrier as well as a seed for the growth of YBCO films on (001)Si. These heterostructures were characterized using x-ray diffraction, high-resolution transmission electron microscopy, and Rutherford backscattering techniques.more » The YSZ films were deposited in oxygen ambient ({minus}9 x 10{sup {minus}4} Torr) at 775{degree}C on (001)Si substrate having <001> YSZ // <001> Si texture. The YBCO thin films were deposited in-situ in oxygen ambient (200 mTorr) at 650{degree}C. The temperature and oxygen ambient for the PZT deposition were optimized to be 530{degree}C and 0.4-0.6 Torr, respectively. The laser fluence to deposit this multilayer structure was 2.5-5.0 J/cm{sup 2}. The <001> textured perovskite PZT films showed a dielectric constant of 800-1000, a saturation polarization of 37.81 {mu}C/cm{sup 2}, remnant polarization of 24.38 {mu}C/cm{sup 2} and a coercive field of 125 kV/cm. 21 refs., 6 figs.« less
  • In this Letter we present the results of a diffusion study of Hf in a Ni{sub 0.54}Zr{sub 0.46} amorphous alloy. We have measured the diffusion properties with and without pressure, up to 1GPa. From these measurements we can deduce an Arrhenius behavior of the diffusion, with an activation energy of 0.76eV and a pre-exponential factor of 7.4{times}10{sup -17}m{sup 2}/s. The activation volume amounts to 8.5{angstrom};{sup 3}. Activation volume and energy are related by the Keyes relationship. We then discuss to what extent presently proposed diffusion mechanisms, point defects, or collective processes can be tested against these results. {copyright} {ital 1997}more » {ital The American Physical Society}« less