Ramirez AP, Hessen B, Winklemann M
Bell Labs, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA.
Phys Rev Lett. 2000 Mar 27;84(13):2957-60. doi: 10.1103/PhysRevLett.84.2957.
We have measured the specific heat C(T) of the S = 3 / 2 Kagome-lattice-containing compound SrCr (9p)Ga (12-9p)O (19). We find little field dependence of the low-temperature C(T), consistent with a low-energy spectrum dominated by many-body singlet excitations. At high temperatures, we recover only approximately 50% of the total R ln4 entropy.
我们测量了含有S = 3 / 2 Kagome晶格的化合物SrCr(9p)Ga(12 - 9p)O(19)的比热C(T)。我们发现低温下C(T)几乎与磁场无关，这与由多体单重激发主导的低能谱一致。在高温下，我们仅恢复了总R ln4熵的约50%。
