Jeremy P. Carlo

Note: I have relocated to Villanova University as of August 2011. My new website can be found at http://homepage.villanova.edu/jeremy.carlo.

Research Associate Canadian Neutron Beam Centre National Research Council PhD (2009)      Physics      Columbia University MA (2003),    MPhil (2007)      Physics      Columbia University BS (2001)      Applied Physics &                    Applied Mathematics      New Jersey Institute of Technology   Contact Information: Address:                Canadian Neutron Beam Centre                National Research Council                Chalk River Laboratories                Bldg. 459, Stn. 18                Chalk River, ON K0J 1J0 (map) Work E-Mail:                   jeremy.carlo@villanova.edu                        (effective August 2011) Home E-Mail:  jcarlo@caa.columbia.edu Phone: 1-613-584-8811 Ext. 44281 Fax:     1-613-584-4040

RESEARCH INTERESTS

My principal research interests are in magnetic materials. In particular, I am interested in the relationship between unconventional superconductivity and magnetism, and magnetism in geometrically frustrated materials. Much of my research thus far has involved the muon spin relaxation and neutron scattering techniques at various facilities throughout North America and the world.

My thesis research (preview), with Tomo Uemura at Columbia University explored magnetism in doped compounds of the Sr₂RuO₄ and FeAs-based superconducting systems.

Currently I an a Research Associate for the National Research Council of Canada, working with Zahra Yamani at the Canadian Neutron Beam Centre, and Bruce Gaulin at McMaster University. My present research includes follow-up studies of these materials, as well as studies of several geometrically frustrated materials using neutron scattering.

For a more basic overview of my research, and some additional details, please see my research page.

 

SELECTED PUBLICATIONS

For my full list of publications click here.

J. P. Carlo et al. "Spin-Triplet Excitations Out of the Singlet Ground State in the Quantum FCC Antiferromagnet Ba₂YMoO₆." Submitted to Physical Review Letters (May 2011). arXiv link

I. M. Gat-Malureanu et al. "muSR and susceptibility measurements of an itinerant-electron system Sr_1-xCa_xRuO₃: quantum evolution from ferromagnet to paramagnet." Submitted to Physical Review B (February 2011).

H. Nojiri et al. "Elucidating High Field Phases of the Multiferroic MnWO₄ with a Pulsed Magnetic Field and Time of Flight Neutron Laue Diffraction." Submitted to Physical Review Letters (January 2011). ORNL news item about this work.

J. Munevar et al. "Static magnetic order of Sr₄A₂O₆Fe₂As₂ (A = Sc and V) revealed by local probes." Submitted to Physical Review B (February 2011). arXiv link

J. P. Carlo et al. "New Magnetic Phase Diagram of (Sr,Ca)₂RuO₄." Submitted to Nature Materials (August 2010).

V. A. Blagojevic et al. "Magnetic phase transition in V₂O₃ nanocrystals." Physical Review B 82, 094453.   arXiv link

T. J. Williams et al. "Superfluid Density and Field-Induced Magnetism in Ba(Fe_1-xCo_x)₂As₂ and Sr(Fe_1-xCo_x)₂As₂ Measured with Muon Spin Relaxation." Physical Review B 82, 094512 (2010).  arXiv link.

J. A. Rodriguez et al. "Study of the ground state properties of LiHo_xY_1-xF₄ using muSR." Physical Review Letters 105, 107203 (2010).  arXiv link

A. A. Aczel et al. "Muon spin rotation/relaxation measurements of the non-centrosymmetric superconductor Mg₁₀Ir₁₉B₁₆." Physical Review B 82, 024520 (2010).   arXiv link

B. S. Conner et al. "Possible Bose-Einstein condensate of magnons in single-crystalline Pb₂V₃O₉." Physical Review B 81, 132401 (2010).

S. R. Dunsiger et al. "Spatially homogeneous ferromagnetism of (Ga,Mn)As." Nature Materials 9, 299 (2010).

J. P. Carlo et al. "Static Magnetic Order and Superfluid Density of RFeAs(O,F) (R=La,Nd,Ce) and LaFePO Studied by Muon Spin Relaxation: Unusual Similarities with the Behavior of Cuprate Superconductors." Physical Review Letters 102, 087001 (2009).

Y. J. Uemura et al. "Phase Separation and Supression of Critical Dynamics at Quantum Transitions of Itinerant Magnets: MnSi and (Sr_1-xCa_x)RuO₃." Nature Physics 3, 29-35 (2007).   arXiv link. PDF from Columbia CISE.   Related News and Views commentary.

 

TALKS AND PRESENTATIONS

You can find several presentations that I have given here:

Adventures in Superconductivity and Magnetism. March 2011
(An introduction to one of my areas of research.)

Adventures in Crystal Growth.
Canadian Neutron Beam Centre seminar, January 2011, Chalk River, ON

Inelastic Magnetic Neutron Scattering on the Spin-Singlet Spin-¹/₂ Compound Ba₂YMoO₆.
2010 American Conference on Neutron Scattering, June 2010, Ottawa, ON

Studies of Magnetism in Ca_2-xSr_xRuO₄ & Sr₂Ru_1-yTi_yO₄.
2010 CIFAR Quantum Materials Main Meeting, May 2010, Montreal, QC.

The Magnetic Phase Diagram of (Sr,Ca)₂(Ru,Ti)O₄ Revealed by muSR.
Seminar given to McMaster University graduate students, June 2010, Hamilton, ON

Concurrent structural and magnetic phase transition in nanopowder V₂O₃.
2009 American Physical Society March Meeting, March 2009, Pittsburgh, PA

Ordered State in (Fe,Co)Sb₂ probed by muSR and Mossbauer Spectroscopy
2008 Strongly Correlated Electron Systems (SCES) Conference, Buzios, Brazil.

 

OUTSIDE ACTIVITIES

For a little over 20 years I have been an amateur astronomer. I have two homemade telescopes - a 6" f/8 equatorial reflector and a 10" f/6.4 motorized Dobsonian - and two store-bought telescopes. I have been a member of Amateur Astronomers, Inc. in New Jersey since the early 1990's, where I was a Qualified Observer on the 24" E. T. Pearson telescope, and was the editor of the club's monthly newsletter, The Asterism, for six years. I frequently travel out to dark-sky sites to observe, and have given a number of astronomy-related lectures for fellow amateurs as well as the general public.

Here are several astronomy-related talks I have given over the last few years:

    Radio Astronomy: Listening to the Sky (for the Renfrew County Amateur Radio Club, January 2011)

    Is Anyone Out There? Solving the Drake Equation (May 2008)

    What Happened to Pluto? (late 2006)

A few more talks on the "lighter side:"

    Famous Last Words (of Scientists and Engineers)

    Guide to Understanding Scientific Papers (not my creation, but culled from collections on the Interwebs....)

    Practical Guide to Using a Slide Rule

I have been an FCC-licensed amateur radio operator since 1994 (Amateur Extra class, call sign N2ZLQ). I am a Volunteer Examiner (VE) with ARRL-VEC and have assisted with numerous licensing exam sessions with the Columbia University Amateur Radio Club's VE Team. From 2006 through 2009 I was involved with the New York City Amateur Radio Emergency Service (ARES), which provides public service radio communications for large events such as marathons and parades, as well as emergency communications in disasters. Since moving to Canada, I have been active with the Renfrew County Amateur Radio Club, and their ARES group as well.

From 2006 through 2009, I was a New York State-certified Emergency Medical Technician, and served as a volunteer EMT, dispatcher and training officer with the Throggs Neck Volunteer Ambulance Corps in the Bronx, NY.

I have also recently been researching my family history, which leads back to Colonial America, Italy, Germany, England, France and Ireland, among other places. I am descended from Benedict Arnold (1615-1678), one of the first governors of Rhode Island, and am a cousin to his much more famous (or is it infamous... depends on who you ask!) great-grandson by the same name. My great-great-great-grandfather Zimron Merriam fought in the American Civil War and was held as a prisoner of war at the infamous Andersonville prison; I have ancestors on both sides of the American Revolution as well (including a few Loyalists who fled to Canada after the war, only to return several decades later to upstate New York). On my father's side, my great-grandfather Rocco Carlo narrowly escaped death in the December 1908 Messina / Reggio Calabria earthquake, after which he came to the United States to start a new life. I've traced another line of my family back to a Thomas B. Wielher, born in 819 AD in England; he is the patriarch of a long line of Wielhers (later changed to Wheeler, my mother's maiden name), and if my math is correct, my great³⁶-grandfather.

 

 

USEFUL NEUTRON SCATTERING STUFF

Here are a few convenient calculators / tables I've generated in Microsoft Excel for designing neutron experiments. They haven't been thoroughly checked for bugs, just enough for my own use, so I provide them "as-is." Please contact me with any questions, and I hope you find them helpful!

Calculate the positions of Aluminum reflections
Gives positions of aluminum peaks in |Q| and in scattering angle for several standard pyrolytic graphite (PG) wavelengths. Also includes values for lambda/2 and lambda/3 harmonics. Useful for determining whether that curious signal is coming from your sample holder...

Neutron flux vs. wavelength for a reactor source
Plots relative neutron flux as a function of wavelength given a moderator / cold source temperature. Assumes a purely Maxwellian distribution.

Calculate nuclear structure factor for a given reflection
Input the atoms in your structure, and the (h,k,l) values for reflections of interest, and this pops out the nuclear structure factors for those reflections. It's probably easier to use something like PowderCell, but this is a good way to check your results.

Magnetic scattering calculator Input a gaussian approximation to a magnetic form factor of interest, the location (h,k,l) of the putative magnetic Bragg reflection, and the structure factor and observed intensity of a reference nuclear reflection, and this calculator tells you Imag/Inuc. It's not bulletproof, but nice to mess around with if you want to estimate whether a magnetic peak will be observable.

Inelastic scattering feasibility calculator
For a triple-axis instrument, input your instrument factors (wavelength, angle limitations, etc.) and this calculator will tell you whether a given (Q,E) position is achievable with those settings. Useful for planning an experiment.

Triple-axis inelastic scattering accessible regions (fixed E_final)
Input instrument details for a triple-axis instrument (assuming a fixed final energy), and this calculator outputs a graph of the accessible region of (Q,E) space accessible with those settings.

Triple-axis inelastic scattering accessible regions (fixed E_initial)
Same as previous, but done assuming a fixed initial energy. Also useful for TOF instruments.

 

USEFUL LINKS

List of CNBC spectrometers at Chalk River

Lectures from 2009 CNBC Summer School.

CNBC Spectrometer Book

Table of Nuclides

IUCr International Tables for Crystallography

Neutron scattering lengths and cross-sections

Information for Visitors to Deep River (from Lachlan Cranswick)

Ontario Winter Road Conditions Planning a drive? Check the road conditions first!