Greenblatt, Martha

	Phone:	732-445-3277
	E-mail:
	FAX:	732-445-5312
	Office:	Wright Rieman Labs 134A/114
	Mail:	Chemistry & Chemical Biology, 610 Taylor Road, Piscataway, NJ 08854

Research Summary

Solid state inorganic chemistry; synthesis and crystal growth of novel transition metal compounds with quasi-low-dimensional properties including perovskite-related manganates, coboltates and ferrates with large magnetoresistant properties, transition metal (Mo, W, Nb) oxide bronzes, metal cluster chalcogenides, transition metal nitrides, and high temperature superconductors. Properties of compounds are characterized by X-ray diffraction, magnetic susceptibility, electronic conductivity, Seebeck effect, X-ray absorption near-edge spectroscopy, and thermal analysis. Structural-physicochemical property relationships are emphasized. Particular interest in compounds with electronic correlations/instabilities that lead to metal-to- insulator or metal-to-charge density wave, or superconducting transitions. Because of the highly aniosotropic behavior of low-dimensional materials, single crystal growth of bulk materials and films are pursued.

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Greenblatt Research Group

Awards & Honors

• 2003 Francis P. Garvan-John M. Olin Award

Publications

1. Large effects of A-site Average Cation Size on the Properties of Double Perovskites Ba_2‑xSr_xMnReO₆: a d⁵-d¹ System. G. Popov, M. Greenblatt, and M. Croft, Phys Rev. B67, 024406/1-024406/9 (2003).
2. Structural, magnetic and transport properties of the two electron-doped Ruddlesden-Popper manganites Ca_3-xTh_xMn₂O₇. M. Lobanov, S. Li and M. Greenblatt, Chem. Mater., 15, 1302-1308 (2003)
3. Structural Disorder and Magnetic Frustration in ALaMnMoO₆ (A=Sr, Ba) Double Perovskites. E. N. Caspi, J. D. Jorgensen, M. Lobanov, and M. Greenblatt, Phys. Rev. B67, 134431-1-134431-11 (2003).
4. Crystal Structure, Magnetic and Electrochemical Properties of a New Quaternary Thiospinel: Ag₂MnSn₃S_8.  Gunjan Garg, Kandalam V. Ramanujachary, Samuel E. Lofland, Maxim V. Lobanov Martha Greenblatt, Trupthi Maddanimath, K. Vijayamohanan and Ashok K. Ganguli, J. Solid State Chem., 174, 229-232 (2003).
5. Transmission Electron Microscopy Study of Ruddlesdon-Popper Ca_n+1Mn_nO_3n+, n = 2 and 3 Compounds.  Leonid A. Bendersky, Martha Greenblatt and Rongji Chen, J. Solid State Chem., 174, 418-423 (2003).
6. Effects of vacancy concentration on the magnetic and transport properties of (La_1‑xPb_x)_1‑yð_yMnO₃ ,Guerman Popov, Jacob Goldsmith, and Martha Greenblatt, J. Solid State Chem., 175, 52-58 (2003).
7. Fermi Surface Studies of the Charge Density Wave State of the Quasi-two-Dimensional Monophosphate Tungsten Bronze P₄W₁₂O₄₄.  U. Beierlein, C. Schlenker⁺, J. Dumas, and M. Greenblatt, Phys. Rev. B67, 235111-235115 (2003).
8. Crystallographic and magnetic structure of the Sr₂MnReO₆ double perovskite. Guerman Popov, Maxim V. Lobanov , Eugene V. Tsiper , Martha Greenblatt, El'ad N. Caspi , Alexandre Borissov, Valery Kiryukhin, Jeffrey W. Lynn, J. Phys.: Condens. Matter 15, 1-11 (2003).
9. Structural and magnetic phase diagram of the two-electron-doped (Ca_1-xCe_x)MnO₃ system: Effects of competition among charge, orbital, and spin ordering. El’ad N. Caspi, Maxim Avdeev, Simine Short, James D. Jorgensen, Maxim V. Lobanov, Zuotao Zeng, Martha Greenblatt, Pappannan Thiyagarajan, Cristian E. Botez, and Peter W. Stephens, Phys. Rev. B in press., 12/03