Ultrasonic investigations near the B-induced quantum critical point of the triangular-lattice antiferromagnet Cs2CuCl4

  title={Ultrasonic investigations near the B-induced quantum critical point of the triangular-lattice antiferromagnet Cs2CuCl4},
  author={Bernd Wolf and Pham Thanh Cong and N. Kr{\"u}ger and Franz Ritter and Wolf Assmus and Michael Lang},
Measurements of the longitudinal elastic constants c11, c22 and c33 and the ultrasonic attenuation α of the quasi-two-dimensional triangular-lattice spin-1/2 Heisenberg antiferromagnet Cs2CuCl4 reveal distinct anomalies near the B-induced quantum-critical point (QCP). These anomalies are particularly strongly pronounced in the ultrasonic attenuation. In isothermal field sweeps performed at low temperatures 0.027 K ≤ T ≤ 0.3 K around the saturation field Bs, the ultrasonic attenuation of all… 
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