Stress me, test me, vex me ... boffins seek Hall Effect in frustrated magnets • The Register
"They contain magnetic moments that, at very low temperatures near absolute zero, should line up in an orderly manner so that all of their 'spins,' a quantum-mechanical property, point in the same direction. Instead, experiments have found that the spins point in random directions. These frustrated materials are also referred to as 'quantum spin ice.'"
Also, frustrated me.