Jeremy P. Carlo

Assistant Professor

Department of Physics

Villanova University

 

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:

        Department of Physics

        Mendel Hall Rm. 365A

        Villanova University

        800 Lancaster Ave.

        Villanova, PA 19085 (map)

 

Work E-Mail: jeremy.carlo@villanova.edu

Home E-Mail: jcarlo@caa.columbia.edu

 

Phone: +1-610-519-3279

Fax: +1-610-519-7465

 

Research Interests

 

My principal research interests are in strongly correlated oxide materials, particularly magnetic and structural properties. I maintain specific interests in the relationship between unconventional superconductivity and magnetism, magnetism in geometrically frustrated materials, and structural aspects of bulk perovskite 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. At Villanova I have established a sample synthesis laboratory, containing several furnaces for synthesis of bulk oxide specimens, and a Siemens D500 powder diffractometer for structural characterization.

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

Currently I am an Assistant Professor in the Physics Department at Villanova University. Prior to that I worked as 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.

Selected Publications

C. M. Thompson et al. "Long-Range Magnetic Order in the 5d2 Double Perovskite Ba2CaOsO6: Comparison with Spin-Disordered Ba2YReO6." Submitted to Physical Review B (December 2013). (ArXiv link.)

 

J. P. Carlo et al. "Spin gap and the nature of the 4d3 magnetic ground state in the frustrated fcc antiferromagnet Ba2YRuO6." Physical Review B 88, 024418 (2013). (ArXiv link.)

 

J. J. Wagman et al. "Two-dimensional incommensurate and three-dimensional commensurate magnetic order and fluctuations in La2-xBaxCuO4" Physical Review B 88, 014412 (2013). (ArXiv link.)

 

J. P. Carlo et al. "New Magnetic Phase Diagram of (Sr,Ca)2RuO4." Nature Materials 11, 323 (2012).

 

I. M. Gat-Malureanu et al. "Muon spin relaxation and susceptibility measurements of an itinerant-electron system Sr1-xCaxRuO3: quantum evolution from ferromagnet to paramagnet." Physical Review B 84, 224415 (2011).

 

J. P. Carlo et al. "Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba2YMoO6.Physical Review B 84, 100404(R) (2011).    arXiv link.

 

H. Nojiri et al. "Elucidating High Field Phases of the Multiferroic MnWO4 with a Pulsed Magnetic Field and Time of Flight Neutron Laue Diffraction." Physical Review Letters 106, 237202 (2011).  

 

J. Munevar et al. "Static magnetic order of Sr4A2O6Fe2As2 (A = Sc and V) revealed by Mossbauer and muon spin relaxation spectroscopies." Physical Review B 84, 024527 (2011). arXiv link

 

V. A. Blagojevic et al. "Magnetic phase transition in V2O3nanocrystals." Physical Review B 82, 094453 (2010).   arXiv link

 

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 (Sr1-xCax)RuO3." Nature Physics 3, 29-35 (2007).   arXiv link.    

 

 

Recent Talks & Presentations

 

You can find several presentations that I have given here:

 

Probing magnetism in geometrically frustrated materials using neutron scattering  

Villanova University Physics/Astronomy Debate, January 2012, Villanova, PA

 

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

 

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

 

Studies of Magnetism in Ca2-xSrxRuO4 & Sr2Ru1-yTiyO4. 
2010 CIFAR Quantum Materials Main Meeting, May 2010, Montreal, QC  (poster)

 

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  (poster)

 

 

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 such as Cherry Springs State Park 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. While in Canada, I was 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 2011 CNBC Neutron Scattering Summer School
Lectures from 2009 CNBC Neutron Scattering Summer School.

CNBC Spectrometer Book

Table of Nuclides

Magnetic Neutron Scattering Form Factors
IUCr International Tables for Crystallography
Neutron scattering lengths and cross-sections

Information for Visitors to Deep River (from Lachlan Cranswick)

 

TRIUMF CMMS Page (access to TRIUMF schedule and muSR data)