Orientational behavior of quantum rotors physisorbed on boron nitride

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.R664· OSTI ID:470857

Kim, K; Sullivan, N S ^[1]

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1. Department of Physics, University of Florida, Gainesville, Florida 32611-8440 (United States)

We report the results of NMR studies of the two-dimensional (2D) phase diagrams for molecular H{sub 2} films (monolayers and submonolayers) adsorbed on BN for ortho-H{sub 2} concentrations 0.3{lt}X{lt}0.745 and temperatures 0.05{lt}T{lt}4.2 K. A 2D quadrupolar glass state has been identified for submonolayer coverages for 0.48{lt}X{lt}0.69 and 0.2{le}T{le}0.6 K. For submonolayer films (75{percent} of full monolayer), an orientationally ordered phase (expected pinwheel structure) was observed for X{ge}0.69 with a transition to a second distinct ordered phase (expected herringbone structure) for X{le}0.69. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 470857
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ABSORPTION
BORON NITRIDES
HYDROGEN
LAYERS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
ORDER-DISORDER TRANSFORMATIONS
PHASE DIAGRAMS
QUANTIZATION
ROTATIONAL STATES
SORPTIVE PROPERTIES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
molecular orientation