Cohn Lab

Spin Seebeck Effect in Cu₂OSeO₃: Test of Bulk Magnon Spin-Current Theory. Akopyan, Prasai, Trump, Marcus, McQueen, and Cohn, Phys. Rev. B 101, 100407(R) (2020).

Spin phases of the helimagnetic insulator Cu₂OSeO₃ probed by magnon heat conduction. Prasai, Akopyan, Trump, Marcus, Huang, McQueen, and Cohn, Phys. Rev. B 99, 020403(R) (2019).

Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu₂OSeO₃. Prasai, Trump, Marcus, Akopyan, Huang, McQueen, and Cohn, Phys. Rev. B 95, 224407 (2017) (Editor's Suggestion).

Extreme Thermopower Anisotropy and Interchain Transport in the Quasi-One-Dimensional Metal Li_0.9Mo₆O₁₇. Cohn, Moshfeghyeganeh, dos Santos, and Neumeier, Phys. Rev. Lett. 112, 186602 (2014).

Giant Nernst Effect and Bipolarity in the Quasi-One-Dimensional Metal, Li_0.9Mo₆O₁₇. Cohn, White, dos Santos, and Neumeier, Phys. Rev. Lett. 108, 056604 (2012).

Giant Electrothermal Conductivity and Spin-phonon Coupling in an Antiferromagnetic Oxide. Chiorescu, Neumeier, and Cohn, Phys. Rev. Lett. 101, 257202 (2008).

Impurity conduction and magnetic polarons in antiferromagnetic oxides. Chiorescu, Cohn, and Neumeier. Phys. Rev. B 76 020404(R) (2007).

Polaron transport in the paramagnetic phase of electron-doped manganites. Cohn, Chiorescu, and Neumeier. Phys. Rev. B 72 024422 (2005).

Low-temperature permittivity of insulating perovskite manganites. Cohn, Peterca, and Neumeier. Phys. Rev. B 70 214433 (2004).

Heat conduction and magnetic phase behavior in electron-doped Ca_1-xLa_xMnO₃ (0< x <0.2). Cohn and Neumeier. Phys. Rev. B 66, 100404 (2002).

Possible signatures of magnetic phase segregation in electron-doped antiferromagnetic CaMnO₃. Neumeier and Cohn. Phys. Rev. B 61, 14319 (2000).

Hole localization in underdoped superconducting cuprates near 1/8 doping. Cohn, Popoviciu, Lin, and Chu. Phys. Rev. B 59, 3823 (1999).

Glasslike Heat Conduction in High-Mobility Crystalline Semiconductors. Cohn, Nolas, Fessatidis, Metcalf, and Slack. Phys. Rev. Lett. 82, 779 (1999).

Dissertation Title

Currently At

Dharmendra Shukla

Low-Temperature Thermal Conductivity in the Metal-Organic Frameworks (MOFs) [C(NH₂)₃][B(HCOO)₃] (B = Cu²⁺, Zn²⁺,Ni²⁺)

postdoc, Florida State Univ.

Artem Akopyan

Low-Temperature Spin Seebeck effect in the Helimagnetic Insulator Cu₂OSeO₃

postdoc, Univ. Miami

Narayan Prasai

postdoc, 2015-2018

Visiting Asst. Prof., St. Mary's College, MD

Saeed Moshfeghyeganeh

Anisotropic Transport Properties of Low-dimensional Molybdenum Bronzes

postdoc, Fl. Int.'l Univ.

Alexandra Cote

undergrad, 2014-15

physics graduate student, Univ. Illinois UC

Narayan Prasai

Spin-Phonon Coupling And Magnetic Heat Transport In Low-Dimensional Quantum Antiferromagnets (2015)

postdoc, Univ. Miami

Alwyn Rebello

postdoc, 2013-14

National University of Singapore

Krishna Neupane

Studies of the Insulator-Metal Transition in La_1-xCa_xMnO₃ and Thin-Film Growth of Nd_0.2Sr_0.8MnO₃ (2009)

Corneliu Chiorescu

Transport Studies of Lightly Electron-Doped Manganese Oxides (2008)

Mihai Peterca

M.S. Degree

Editor, John Wiley and Sons

Bartosz Zawilski

postdoc

Laboratoire Louis Neel, Grenoble

Roland Maier

Novel Phase of Thin-Film Iron-Doped Barium Titanate (2002)

Gymnasium Instructor, Heidelberg, Germany

Ciprian Popoviciu

Thermal Transport and Phase Behavior of Cuprate Superconductors (1997)

CISCO Systems

Dmitri Litvinov

University of Houston

Mary O. Olagunju, Elsayed M. Zahran, Elnaz Zeynaloo, Dharmendra Shukla, Joshua L. Cohn, Bapurao Surnar, Shanta Dhar, Leonidas G. Bachas, and Marc R. Knecht, Design of Pd-Decorated SrTiO₃/BiOBr Heterojunction Materials for Enhanced Visible-Light-Based Photocatalytic Reactivity, Langmuir 37, 11986 (2021). (Full Text PDF)

Mary O. Olagunju, Elsayed M. Zahran, Jacqueline M. Reed, Elnaz Zeynaloo, Dharmendra Shukla, Joshua L. Cohn, Bapurao Surnar, Shanta Dhar, Leonidas G. Bachas, and Marc R. Knecht, Halide Effects in BiVO₄/BiO_X Heterostructures Decorated with Pd Nanoparticles for Photocatalytic Degradation of Rhodamine B as a Model Organic Pollutant, ACS Applied Nano Materials 4, 3262 (2021). (Full Text PDF)

Ahmed E. ElMetwally, Elnaz Zeynaloo, Dharmendra Shukla, Bapurao Surnar, Shanta Dhar, Joshua L. Cohn, Marc R. Knecht, and Leonidas G. Bachas, Cu₂O Cubes Decorated with Azine-Based Covalent Organic Framework Spheres and Pd Nanoparticles as Tandem Photocatalyst for Light-Driven Degradation of Chlorinated Biphenyls, ACS Applied Nano Materials 4, 2795 (2021). (Full Text PDF)

Mary O. Olagunju, Xavier Poole, Patricia Blackwelder, Melonie P. Thomas, Beth S. Guiton, Dharmendra Shukla, Joshua L. Cohn, Bapurao Surnar, Shanta Dhar, Elsayed M. Zahran, Leonidas G. Bachas, and Marc R. Knecht, Size-Controlled SrTiO₃ Nanoparticles Photodecorated with Pd Cocatalysts for Photocatalytic Organic Dye Degradation, ACS Applied Nano Materials 3, 4904 (2020). (Full Text PDF)

D. S. Inosov, Y. O. Onykiienko, Y. V. Tymoshenko, A. Akopyan, D. Shukla, N. Prasai, M. Doerr, S. Zherlitsyn, D. Voneshen M. Boehm, V. Tsurkan, V. Felea, A. Loidl, and J. L. Cohn, Magnetic-field dependence of low-energy magnons, anisotropic heat conduction, and spontaneous relaxation of magnetic domains in the cubic helimagnet ZnCr₂Se₄, Physical Review B 102, 184431 (2020). (Full Text PDF)

Mahamalage Kusumitha Perera, James D. Englehardt, Joshua L. Cohn, Edward A Dauer, Dharmendra Shukla, Electrohydromodulation for phosphate recovery from wastewater, Separation and Purification Technology 247, 116909 (2020). (Full Text PDF)

A. Akopyan, N. Prasai, B. A. Trump, G. G. Marcus, T. M. McQueen, and J. L. Cohn, Spin Seebeck Effect in Cu₂OSeO₃: Test of Bulk Magnon Spin-Current Theory, Physical Review B 101, 100407(R) (2020). (Full Text PDF)

D. Shukla, N. Prasai, T. M. Carlino, M. M. A. Mazza, A. M. Scott, and J. L. Cohn, Anisotropic Heat Conduction in the Metal Organic Framework Perovskites [C(NH₂)₃]X(HCOO)₃ (X=Cu, Zn), Applied Physics Letters 114, 081907 (2019). (Full Text PDF)

N. Prasai, A. Akopyan, B. A. Trump, G. G. Marcus, S. X. Huang, T. M. McQueen, and J. L. Cohn, Spin phases of the helimagnetic insulator Cu₂OSeO₃ probed by magnon heat conduction, Physical Review B 99, 020403(R) (2019). (Full Text PDF)

D. C. Bell, C. J. Munro, J. M. Slocik, D. Shukla, A. D. Parab, J. Cohn, and M. Knecht, Biomimetic strategies to produce catalytically reactive CuS nanodisks, Nanoscale Advances 1, 2857-2865 (2019). (Full Text PDF)

C. J. Munro, E. C. Bell, M. O. Olagunju, J. L. Cohn, E. M. Zahran, L. G. Bachas, and M. R. Knecht, Amino Acids for Sustainable Production of Cu₂O Materials: Effects on Morphology and Photocatalytic Reactivity, ACS Sustainable Chemistry and Engineering 7, 17055-17064 (2019). (Full Text PDF)

N. Prasai, A. B. Christian, J. J. Neumeier, and J. L. Cohn, Resonant scattering of phonons in the quasi-one-dimensional spin-chain compounds AB₂O₆ (A = Ni, Co; B = Sb, Ta) , Physical Review B 98, 134449 (2018). (Full Text PDF)

N. Prasai, B. A. Trump, G. G. Marcus, A. Akopyan, S. X. Huang, T. M. McQueen, and J. L. Cohn, Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu₂OSeO₃, Physical Review B 95, 224407 (2017). (Full Text PDF)

S. Moshfeghyeganeh, A. N. Cote, J. J. Neumeier and J. L. Cohn, Anisotropic transport in the quasi-one-dimensional semiconductor Li_0.33MoO₃, J. Appl. Phys. 119, 095105 (2016). (Full Text PDF)

S. H. Masunaga, A. Rebello, A. T. Schye, N.Prasai, J. J. Neumeier, and J. L. Cohn, Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi₄O₁₀): Observation of structural phase transitions, J. Phys. Chem. Sol. 85, 69 (2015). (Full Text PDF)

N. Prasai, A. Rebello, A. B. Christian, J. J. Neumeier, and J. L. Cohn, Phonon-spin scattering and magnetic heat transport in the quasi-one-dimensional spin-1/2 antiferromagnetic chain compound CuSb₂O₆, Physical Review B 91, 054403 (2015). (Full Text PDF)

J. L. Cohn, S. Moshfeghyeganeh, C. A. M. dos Santos, and J. J. Neumeier, Extreme Thermopower Anisotropy and Interchain Transport in the Quasi-One- Dimensional metal Li_0.9Mo₆O₁₇, Physical Review Letters 112, 186602 (2014). (Full Text PDF)

J. L. Cohn, P. Boynton, J. S. Triviño, J. Trastoy, B. D. White, C. A. M. dos Santos, and J. J. Neumeier, Stoichiometry, structure, and transport in the quasi-one- dimensional metal Li_0.9Mo₆O₁₇, Physical Review B 86, 195143 (2012). (Full Text PDF)

E. J. Moon, J. M. Rondinelli, N. Prasai, B. A. Gray, M. Kareev, J. Chakhalian, and J. L. Cohn, Strain-controlled band engineering and self-doping in ultrathin LaNiO₃ films, Physical Review B 85, 121106(R) (2012). (Full Text PDF)

J. L.Cohn, B. D. White, C. A. M. dos Santos, and J. J. Neumeier, Giant Nernst Effect and Bipolarity in the Quasi-One-Dimensional Metal Li_0.9Mo₆O₁₇, Physical Review Letters 108, 056604 (2012). (Full Text PDF)

J. Chakhalian, J. M. Rondinelli, Jian Liu, B. A. Gray, M. Kareev, E. J. Moon, N. Prasai, J. L. Cohn, M. Varela, I. C. Tung, M. J. Bedzyk, S. G. Altendorf, F. Strigari, B. Dabrowski, L. H. Tjeng, P. J. Ryan, and J.W. Freeland, Asymmetric Orbital-Lattice Interactions in Ultrathin Correlated Oxide Films, Physical Review Letters 107, 116805 (2011). (Full Text PDF)

A. de Campos, M. S. da Luz, C. A. M. dos Santos, A. T. Rice, A. M. Deml, B. D. White, J. J. Neumeier, and J. L. Cohn, Physical properties of quasi-one-dimensional SrNbO_3.41 and Luttinger liquid analysis of electrical transport, Physical Review B 82, 125117 (2010). (Full Text PDF)

K. Neupane, J. J. Neumeier, and J. L. Cohn, Anisotropic in-plane strain and transport in epitaxial Nd_0.2Sr_0.8MnO₃ thin films, Journal of Applied Physics 106, 123904 (2009). (Full Text PDF)

B. D. White, J. A. Souza, C. Chiorescu, J. J. Neumeier, and J. L. Cohn, Magnetic, transport, and thermodynamic properties of CaMn₂O₄ single crystals, Physical Review B 79, 104427 (2009). (Full Text PDF)

C. Chiorescu, J. J. Neumeier, and J. L. Cohn, Giant Electrothermal Conductivity and Spin-Phonon Coupling in an Antiferromagnetic Oxide, Physical Review Letters 101, 257202 (2008). (Full Text PDF)

C. Chiorescu, J. L. Cohn, and J. J. Neumeier, Impurity conduction and magnetic polarons in antiferromagnetic oxides, Physical Review B 76, 020404(R) (2007). (Full Text PDF)

K. P. Neupane, J. L. Cohn, H. Terashita, and J. J. Neumeier, Doping dependence of polaron hopping energies in La_1-xCa_xMnO₃ (0 < x < 0.15), Physical Review B 74, 144428 (2006). (Full Text PDF)

M. A. Pires, C. Israel, W. Iwamoto, R. R. Urbano, O. Agüero, I. Torriani, C. Rettori, P. G. Pagliuso, L. Walmsley, Z. Le, J. L. Cohn, and S. B. Oseroff, Role of oxygen vacancies in the magnetic and dielectric properties of the high-dielectric-constant system CaCu3Ti4O12: An electron-spin resonance study, Physical Review B 73, 224404 (2006). (Full Text PDF)

C. Chiorescu, J. J. Neumeier, and J. L. Cohn, Magnetic inhomogeneity and magnetotransport in electron-doped Ca_1-xLa_xMnO₃ (0 < x < 0.10) Physical Review B 73, 014406 (2006). (Full Text PDF)

J. L. Cohn, C. Chiorescu, and J. J. Neumeier, Polaron transport in the paramagnetic phase of electron-doped manganites, Physical Review B 72, 024422 (2005). (Full Text PDF)

J. L. Cohn, M. Peterca, and J. J. Neumeier, Giant dielectric permittivity of electron-doped manganite thin films, Ca_1-xLa_xMnO₃ (0<=x<=0.03), Journal of Applied Physics 97, 034102 (2005). (Full Text PDF)

J. L. Cohn, M. Peterca, and J. J. Neumeier, Low-temperature permittivity of insulating perovskite manganites, Physical Review B 70, 214433 (2004). (Full Text PDF)

G.S. Nolas, J.L. Cohn, J. S. Dyck, C. Uher, G. A. Lamberton, Jr., and T.M. Tritt, Low temperature transport properties of polycrystalline Ba₈Ga₁₆Sn₃₀ Journal of Materials Research 19, 3556 (2004).

R. Maier and J. L. Cohn, Ferroelectric and ferrimagnetic iron-doped thin-film BaTiO3: Influence of iron on physical properties, Journal of Applied Physics 92, 5429 (2002). (Full Text PDF)

J. L. Cohn and J. J. Neumeier, Heat conduction and magnetic phase behavior in electron-doped Ca_1-xLa_xMnO₃ (0< x <0.2), Physical Review B 66, 100404(R) (2002). (Full Text PDF)

G. S. Nolas, D. G. Vanderveer, A. P. Wilkinson, and J. L. Cohn, Temperature dependent structural and transport properties of the type II clathrates A₈Na₁₆E₁₃₆ (A = Cs or Rb and E = Ge or Si), Journal of Applied Physics 91, 8970 (2002). (Full Text PDF)

G. S. Nolas, J. L. Cohn, J. S. Dyck, C. Uher, and J. Yang Transport properties of polycrystalline type-I Sn clathrates, Physical Review B 65, 165201 (2002). (Full Text PDF)

R. Maier, J. L. Cohn, J. J. Neumeier, and L. A. Bendersky, Ferroelectricity and ferrimagnetism in iron-doped BaTiO₃, Applied Physics Letters 78, 2356 (2001). (Full Text PDF)

J. J. Neumeier and J. L. Cohn, Possible signatures of magnetic phase segregation in electron-doped antiferromagnetic CaMnO₃, Physical Review B 61, 14319 (2000). (Full Text PDF)

J. L. Cohn, Electrical and Thermal Transport in Perovskite Manganites, Journal of Superconductivity: Incorporating Novel Magnetism 13, 291 (2000). (Full Text PDF)

J. L. Cohn, Heat Conduction and Charge Ordering in Perovskite Manganites, Nickelates and Cuprates, Thermal Conductivity 25, Thermal Expansion 13, ed. by C. Uher and D. T. Morelli, (Technomic Publishing, Lancaster, PA, 2000), pp. 87-97.

L. A. Bendersky, R. Maier, J. L. Cohn, and J. J. Neumeier, Structural studies of pulsed-laser-deposited Ba₄Fe₄Ti₃O₁₆ oxide films, Journal of Materials Research 15, 1389 (2000).

G. S. Nolas, T. J. Weakley, J. L. Cohn, and R. Sharma, Structural properties and thermal conductivity of crystalline Ge clathrates, Physical Review B 61, 3845 (2000). (Full Text PDF)

Selection of Papers Prior to 2000

1. J. L. Cohn, C. P. Popoviciu, Q. M. Lin, and C. W. Chu, Structural, chemical and transport properties of a new clathrate compound: Cs₈Zn₄Sn₄₂, Chemistry of Materials 1, 2470 (1999). (Full Text PDF)
2. J. L. Cohn, G. S. Nolas, V. Fessatidis, T. H. Metcalf, and G. A. Slack, Glasslike Heat Conduction in High-Mobility Crystalline Semiconductors, Physical Review Letters 82, 779 (1999). (Full Text PDF)
3. J. L. Cohn, C. P. Popoviciu, Q. M. Lin, and C. W. Chu, Hole localization in underdoped superconducting cuprates near 1/8 doping, Physical Review B 59, 3823 (1999). (Full Text PDF)
4. J. L. Cohn, G. S. Nolas, V. Fessatidis, T. H. Metcalf, and G. A. Slack, Thermal Transport as a Probe of Localized Charge and Lattice Distortions in Manganites and Cuprates, Journal of Superconductivity 12, 281 (1999). (Full Text PDF)
5. G. S. Nolas, J. L. Cohn, G. A. Slack, and S. B. Schujman, Semiconducting Ge clathrates: Promising candidates for thermoelectric applications, Applied Physics Letters 73, 178 (1998). (Full Text PDF)
6. J. L. Cohn and J. Karpinski, Anisotropic in-plane thermal conductivity of single-crystal YBa₂Cu₄O₈, Physical Review B 58, 14617 (1998). (Full Text PDF)
7. G. S. Nolas, J. L. Cohn, and G. A. Slack, Effect of partial void filling on the lattice thermal conductivity of skutterudites, Physical Review B 58, 164 (1998). (Full Text PDF)
8. J. L. Cohn, J. J. Neumeier, C. P. Popoviciu, K. J. McClellan, and Th. Leventouri, Local lattice distortions and thermal transport in perovskite manganites, Physical Review B 56, R8495 (1997). (Full Text PDF)
9. C. P. Popoviciu and J. L. Cohn, Thermal transport in YBa₂Cu₃O_6+x: Doping dependence across the phase diagram, Physical Review B 55, 3155 (1997). (Full Text PDF)
10. S. E. Barnes, J. L. Cohn, and F. Zuo, The Possibility of Flux Flow Spectroscopy, Physical Review Letters 77, 3252 (1996). (Full Text PDF)
11. Joshua L. Cohn, Superconducting-state enhancement of thermal conductivity in the cuprates: Correlation with the pair density, Physical Review B 53, R2963 (1996). (Full Text PDF)
12. J. L. Cohn, C. K. Lowe-Ma, and T. A. Vanderah, Anomalous phonon damping and thermal conductivity in insulating cuprates, Physical Review B 52, R13134 (1995). (Full Text PDF)