Jeremy P. Carlo

Assistant Professor

Department of Physics

Villanova University


PhD (2009)


        Columbia University


MA (2003), MPhil (2007)


        Columbia University


BS (2001)

        Applied Physics & Applied Mathematics

        New Jersey Institute of Technology


Contact Information:



      Department of Physics

      Mendel Hall Rm. 365D   (new location!)

      Villanova University

      800 Lancaster Ave.

      Villanova, PA 19085 (map)


Work E-Mail:

Home E-Mail:


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

J. J. Wagman et al. "Neutron scattering studies of spin-phonon hybridization and superconducting spin gaps in the high-temperature superconductor La2-x(Sr,Ba)xCuO4 Physical Review B 93, 094416 (2016).  (ArXiv link.)

B. J. Chen et al.  "(Sr,Na)(Zn,Mn)2As2: A diluted ferromagnetic semiconductor with the hexagonal CaAl2Si2 type structure."  Physical Review B 90, 155202 (2014).

K. Zhao et al.  "(Ca,Na)(Zn,Mn)2As2: A new spin and charge doping decoupled diluted ferromagnetic semiconductor."  Journal of Applied Physics 116, 163906 (2014).

C. M. Thompson et al. "Long-Range Magnetic Order in the 5d2 Double Perovskite Ba2CaOsO6: Comparison with Spin-Disordered Ba2YReO6." Journal of Physics: Condensed Matter 26, 306003 (2014). (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:


Structural and Magnetic Phase Coexistence in Oxygen Deficient Perovskites (Sr,Ca)FeO2.5+d.  March 2016, American Physical Society March Meeting, Baltimore, MD. (conference poster)


Geometric Magnetic Frustration in Li3Mg2OsO6 Studied with Muon Spin Relaxation.  March 2016, American Physical Society March Meeting, Baltimore, MD. (conference talk)


Long range magnetic order in spin-orbit-coupled double perovskites Ba2YRuO6 and Ba2CaOsO6 probed with neutron scattering and muon spin relaxation.  (abstract)

July 2014, International Conference on Highly Frustrated Magnetism (HFM 2014), Cambridge, UK.  (conference poster)


Long range magnetic order in spin-orbit-coupled double perovskites Ba2YRuO6 and Ba2CaOsO6 probed with neutron scattering and muon spin relaxation

June 2014, American Conference on Neutron Scattering (ACNS 2014), Knoxville, TN. (conference talk)


Geometric Magnetic Frustration in Double Perovskite Oxides A2BB'O6

June 2014, Oxides for Energy Meeting, Philadelphia, PA. (invited talk)


Adventures in Frustrated Magnetism.

St. Joseph's University Physics Seminar, February 2014, Philadelphia, PA (invited talk, presentation for undergraduates)


Probing magnetism in the geometrically frustrated antiferromagnet Ba2YMoO6 using inelastic neutron scattering.

Seminar given at the Joint Institute for Neutron Sciences (JINS), Oak Ridge National Laboratory, and as a Condensed Matter Physics seminar at the University of Tennessee - Knoxville, April 2012.


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




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.   I currently serve as Secretary and newsletter editor of the Delaware Valley Amateur Astronomers.

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), and currently serve as President of the Mid-Atlantic Amateur Radio Club (MARC).  I am a Volunteer Examiner (VE) with ARRL-VEC, and in the past was active with ARES (Amateur Radio Emergency Service), which provides radio communications for public service events and in response to emergencies and disasters.

From 2006 through 2009, I was a New York State 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)