Bose-Einstein Condensation and Bose Glasses in an S = 1 Organo-Metallic Quantum Magnet

Technical Report · Fri Jun 01 00:00:00 EDT 2012

DOI:https://doi.org/10.2172/1042992· OSTI ID:1042992

Zapf, Vivien ^[1]

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1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

I will speak about Bose-Einstein condensation (BEC) in quantum magnets, in particular the compound NiCl2-4SC(NH2)2. Here a magnetic field-induced quantum phase transition to XY antiferromagnetism can be mapped onto BEC of the spins. The tuning parameter for BEC transition is the magnetic field rather than the temperature. Some interesting phenomena arise, for example the fact that the mass of the bosons that condense can be strongly renormalized by quantum fluctuations. I will discuss the utility of this mapping for both understanding the nature of the quantum magnetism and testing the thermodynamic limit of Bose-Einstein Condensation. Furthermore we can dope the system in a clean and controlled way to create the long sought-after Bose Glass transition, which is the bosonic analogy of Anderson localization. I will present experiments and simulations showing evidence for a new scaling exponent, which finally makes contact between theory and experiments. Thus we take a small step towards the difficult problem of understanding the effect of disorder on bosonic wave functions.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1042992
• Report Number(s): LA-UR--12-21827
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BOSE-EINSTEIN CONDENSATION
BOSONS
Condensed Matter Physics
Superconductivity & Superfluidity(75)
FLUCTUATIONS
GLASS
High Magnetic Field Science
MAGNETIC FIELDS
MAGNETISM
MAGNETS
TESTING
THERMODYNAMICS
TUNING
WAVE FUNCTIONS